Low fertility of wild hybrid male flycatchers despite recent divergence
... divergence between two populations increases, the strength of selection against hybrids is likely to increase. Extrinsic sources of postzygotic isolation, when hybrids experience lower fitness for ecological reasons or owing to lower sexual attractiveness, are thought to play an important role at ea ...
... divergence between two populations increases, the strength of selection against hybrids is likely to increase. Extrinsic sources of postzygotic isolation, when hybrids experience lower fitness for ecological reasons or owing to lower sexual attractiveness, are thought to play an important role at ea ...
Genetic quality and sexual selection: an integrated framework for
... of male indicator traits that facilitated mate choice by advertising the quality or quantity of a male’s resources (reviewed in Møller & Jennions 2001). However, there are many other mating systems (and perhaps most mating systems) in which females receive no resources from males (called nonresource ...
... of male indicator traits that facilitated mate choice by advertising the quality or quantity of a male’s resources (reviewed in Møller & Jennions 2001). However, there are many other mating systems (and perhaps most mating systems) in which females receive no resources from males (called nonresource ...
E. Selection 1. Measuring “fitness” – differential reproductive
... Rate of change depends on the strength of selection; the difference in reproductive success among genotypes. In this case, a new adaptive mutant allele has been produced in the population. The “selection differential”, s, is selection AGAINST the existing allele that had become ‘fixed’ in the popula ...
... Rate of change depends on the strength of selection; the difference in reproductive success among genotypes. In this case, a new adaptive mutant allele has been produced in the population. The “selection differential”, s, is selection AGAINST the existing allele that had become ‘fixed’ in the popula ...
Copyright © 2002 by the Genetics
... J. R. Chasnov* and King L. Chow†,1 *Department of Mathematics and †Department of Biology, Hong Kong University of Science and Technology, Clear Water Bay, ...
... J. R. Chasnov* and King L. Chow†,1 *Department of Mathematics and †Department of Biology, Hong Kong University of Science and Technology, Clear Water Bay, ...
Selection: an overview
... is useful on the individual as well as on the group level). Interesting cases arise if there are conflicts. There are many such cases known, and almost always the individual level wins. Examples include many cases of sexual selection. A famous example, already discussed by Darwin, is the peacock’s t ...
... is useful on the individual as well as on the group level). Interesting cases arise if there are conflicts. There are many such cases known, and almost always the individual level wins. Examples include many cases of sexual selection. A famous example, already discussed by Darwin, is the peacock’s t ...
Chapter 15 Review - Blue Valley Schools
... 1 unaffected daughter : 1 son with hypophosphatemia 1 daughter with hypophosphatemia : 1 unaffected son 3 unaffected females : 1 male with hypophosphatemia 2 unaffected females : 1 unaffected male : 1 male with hypophosphatemia 1 unaffected female : 1 female with hypophosphatemia : 1 unaffected male ...
... 1 unaffected daughter : 1 son with hypophosphatemia 1 daughter with hypophosphatemia : 1 unaffected son 3 unaffected females : 1 male with hypophosphatemia 2 unaffected females : 1 unaffected male : 1 male with hypophosphatemia 1 unaffected female : 1 female with hypophosphatemia : 1 unaffected male ...
Albinism, at (Mueller and Hutt, ii). This is an imperfect
... almost normal except for missing or defective remiges. Homozygous males are affected less than the hemizygous females. About half the naked chicks die during the last two or three days of incubation, and others after hatching, so that without extra care only slightly more than 25 per cent, of the zy ...
... almost normal except for missing or defective remiges. Homozygous males are affected less than the hemizygous females. About half the naked chicks die during the last two or three days of incubation, and others after hatching, so that without extra care only slightly more than 25 per cent, of the zy ...
Sex Determination and Sex
... animals; the uppermost animals are always male. This type of sexual development is called sequential hermaphroditism; each individual animal can be both male and female, although not at the same time. In Crepidula fornicata, sex is determined environmentally by the limpet’s position in the stack. 1 ...
... animals; the uppermost animals are always male. This type of sexual development is called sequential hermaphroditism; each individual animal can be both male and female, although not at the same time. In Crepidula fornicata, sex is determined environmentally by the limpet’s position in the stack. 1 ...
PDF
... and in Smith and von Borstel (38). The use of contrived dominant lethality was suggested by Smith and von Borstel (38) to circumvent two undesirable direct effects of mutagenic agents on insects that are released for population suppression. In some species, such as a boll weevil, mutagenic agents us ...
... and in Smith and von Borstel (38). The use of contrived dominant lethality was suggested by Smith and von Borstel (38) to circumvent two undesirable direct effects of mutagenic agents on insects that are released for population suppression. In some species, such as a boll weevil, mutagenic agents us ...
Slide 1
... peas are ideally suited to the study of heredity • many varieties are available with easily distinguishable traits that can be quantitified • they are small, easy to grow, and produce large numbers of offspring quickly • their reproductive organs can be easily manipulated so that pollination can b ...
... peas are ideally suited to the study of heredity • many varieties are available with easily distinguishable traits that can be quantitified • they are small, easy to grow, and produce large numbers of offspring quickly • their reproductive organs can be easily manipulated so that pollination can b ...
Color and Communication in Habronattus Jumping Spiders: Tests of
... Differences between males and females can evolve through a variety of mechanisms, including sexual and ecological selection. Because coloration is evolutionarily labile, sexually dichromatic species are good models for understanding the evolution of sex differences. While many jumping spiders exhibi ...
... Differences between males and females can evolve through a variety of mechanisms, including sexual and ecological selection. Because coloration is evolutionarily labile, sexually dichromatic species are good models for understanding the evolution of sex differences. While many jumping spiders exhibi ...
C:\Eudora Mail\Attach\student virtual fly part 11.wpd
... common morphological variants (bristles, eye colour, body colour, wing size, etc.) based on the actual dominant/recessive inheritance patterns and linkage relationships known for these traits in Drosophila melanogaster. For information on Drosophila melanogaster that you will need for this lab, go t ...
... common morphological variants (bristles, eye colour, body colour, wing size, etc.) based on the actual dominant/recessive inheritance patterns and linkage relationships known for these traits in Drosophila melanogaster. For information on Drosophila melanogaster that you will need for this lab, go t ...
What is the appropriate timescale for measuring
... years, their allocation of energy to reproduction is still directly comparable. Thus, for example, one could compare total reproductive allocation to body size between these two taxa. Unfortunately, the comparison breaks down as soon as we try to compare energy allocation to reproduction vs. to othe ...
... years, their allocation of energy to reproduction is still directly comparable. Thus, for example, one could compare total reproductive allocation to body size between these two taxa. Unfortunately, the comparison breaks down as soon as we try to compare energy allocation to reproduction vs. to othe ...
Animal Reproduction - Smyth County Schools
... Asexual Reproduction • Regeneration – parent separates into two or more pieces & each piece forms new organism – In some instances just a new part grows – Sponges, sea stars, jellyfish, planaria – Also be clones http://www.starfish.ch/reef/echinoderms.html ...
... Asexual Reproduction • Regeneration – parent separates into two or more pieces & each piece forms new organism – In some instances just a new part grows – Sponges, sea stars, jellyfish, planaria – Also be clones http://www.starfish.ch/reef/echinoderms.html ...
Glassman, S.
... pressure of the BM1 inversion in one X. the combination of heterozygous inversions in the presence of a free Y causes a high frequency of non-disjunction of the X’s, with resultant matroclinous daughters, bearing both the mother’s X’s, that can be scored for visible mutations arising in the original ...
... pressure of the BM1 inversion in one X. the combination of heterozygous inversions in the presence of a free Y causes a high frequency of non-disjunction of the X’s, with resultant matroclinous daughters, bearing both the mother’s X’s, that can be scored for visible mutations arising in the original ...
as a PDF - Instituto Nacional da Mata Atlântica
... Trophic ontogeny was observed in O. striatus in this study. As there is no evidence of spatial partitioning between juvenile and adults, both may be dividing the available food resource. Only for the smallest juveniles was the size of prey ingested significantly different from the other size classes ...
... Trophic ontogeny was observed in O. striatus in this study. As there is no evidence of spatial partitioning between juvenile and adults, both may be dividing the available food resource. Only for the smallest juveniles was the size of prey ingested significantly different from the other size classes ...
In this multi-part lab, you will be given two mutant traits to study in
... c. Label your crosses with the following information: i. Your group initials ii. Gender and genotype of flies in the cross (use zodiac signs and gene symbols to save space) iii. Today’s date 3. Lay your vials on their sides until the flies wake up. Once awake, the vial can be stored upright in the i ...
... c. Label your crosses with the following information: i. Your group initials ii. Gender and genotype of flies in the cross (use zodiac signs and gene symbols to save space) iii. Today’s date 3. Lay your vials on their sides until the flies wake up. Once awake, the vial can be stored upright in the i ...
Jobling, M.A. - University of Leicester
... male meiosis there is a problem: the X chromosome is mismatched with the much smaller Y chromosome. The solution is the preservation of a small region of homology where crossing over can still occur (Figure 3A). This region represents only about 5% of the length of the Y chromosome, so the bulk neve ...
... male meiosis there is a problem: the X chromosome is mismatched with the much smaller Y chromosome. The solution is the preservation of a small region of homology where crossing over can still occur (Figure 3A). This region represents only about 5% of the length of the Y chromosome, so the bulk neve ...
Going Tuskless Decades of poaching and overhunting of large
... replace his set of milk teeth, extending from a socket in the skull. Prying bark from trees, digging for water or roots, fighting other bulls—elephants’ tusks perform a variety of functions. According to Dr. Poole, an elephant ethologist, studied the effects of poaching on East Africa’s elephant ...
... replace his set of milk teeth, extending from a socket in the skull. Prying bark from trees, digging for water or roots, fighting other bulls—elephants’ tusks perform a variety of functions. According to Dr. Poole, an elephant ethologist, studied the effects of poaching on East Africa’s elephant ...
A View of Life
... Territoriality is protecting an area against other individuals. – Red Deer Stags (males) compete for groups of hinds (females). Hinds only mate with one stag. Harem Master must be large and powerful to fight off challengers. Less body fat, thus may be more likely to starve in bad times, and ha ...
... Territoriality is protecting an area against other individuals. – Red Deer Stags (males) compete for groups of hinds (females). Hinds only mate with one stag. Harem Master must be large and powerful to fight off challengers. Less body fat, thus may be more likely to starve in bad times, and ha ...
Inbreeding uncovers fundamental differences in the
... Inbreeding depression is most pronounced for traits closely associated with fitness. The traditional explanation is that natural selection eliminates deleterious mutations with additive or dominant effects more effectively than recessive mutations, leading to directional dominance for traits subject ...
... Inbreeding depression is most pronounced for traits closely associated with fitness. The traditional explanation is that natural selection eliminates deleterious mutations with additive or dominant effects more effectively than recessive mutations, leading to directional dominance for traits subject ...
Drosophila melanogaster
... either normal (called as wanting) or short-vestigial (called as lacking). These wings are equipped with a complete system of veins termed venation. Modified wings, called halteres, can be found in the thorax. They are movable and are capable of vibration. They have compound eyes and bristles on the ...
... either normal (called as wanting) or short-vestigial (called as lacking). These wings are equipped with a complete system of veins termed venation. Modified wings, called halteres, can be found in the thorax. They are movable and are capable of vibration. They have compound eyes and bristles on the ...
Human Genetics
... homologous chromosomes do not move apart in Meiosis I or sister chromatids do not separate during Meiosis II leaves one cell with too few chromosomes and one cell with too many. Triploids develop from the fertilization of an abnormal diploid egg, produced from the nondisjunction of all chromosomes. ...
... homologous chromosomes do not move apart in Meiosis I or sister chromatids do not separate during Meiosis II leaves one cell with too few chromosomes and one cell with too many. Triploids develop from the fertilization of an abnormal diploid egg, produced from the nondisjunction of all chromosomes. ...
Sexual dimorphism
Sexual dimorphism is a phenotypic differentiation between males and females of the same species. This differentiation happens in organisms who reproduce through sexual reproduction, with the prototypical example being for differences in characteristics of reproductive organs. Other possible examples are for secondary sex characteristics, body size, physical strength and morphology, ornamentation, behavior and other bodily traits. Traits such as ornamentation and breeding behavior found in only one sex imply that sexual selection over an extended period of time leads to sexual dimorphism.