Density-Dependent Sexual Differentiation in Mutants of Ceratopteris
... strains of Ceratopteris richardii significantly alters the percentage of male gametophytes in densitydependent sexual differentiation. In addition to the wild type strain (RNWT1), ten other mutant strains (abr48, cp, det30, fdr1, her1, him1, rum1, slo1, stl2 and zzz1) were included in the study. Thi ...
... strains of Ceratopteris richardii significantly alters the percentage of male gametophytes in densitydependent sexual differentiation. In addition to the wild type strain (RNWT1), ten other mutant strains (abr48, cp, det30, fdr1, her1, him1, rum1, slo1, stl2 and zzz1) were included in the study. Thi ...
These photos show lions (Panthera leo) and tigers (Panthera tigris
... the tigress genes, causing an abundance of the growth hormone and therefore the offspring is much larger. This example of genetic imprinting has evolved in lions due to their mating behaviour. Lions are social animals where a female will breed with more than one male. The male wants to ensure his em ...
... the tigress genes, causing an abundance of the growth hormone and therefore the offspring is much larger. This example of genetic imprinting has evolved in lions due to their mating behaviour. Lions are social animals where a female will breed with more than one male. The male wants to ensure his em ...
document
... promiscuous groups Male reproductive success increases with number of mates Female reproductive success does not increase with multiple mates ...
... promiscuous groups Male reproductive success increases with number of mates Female reproductive success does not increase with multiple mates ...
Sex-Influenced Genes - NCEA Level 2 Biology
... In females the gene acts as a recessive, so a woman must have two recessive genes to show baldness. In men, only one baldness gene is needed. ...
... In females the gene acts as a recessive, so a woman must have two recessive genes to show baldness. In men, only one baldness gene is needed. ...
Psychology of Gender and Sex Differences
... Jacqueline-Marie (TA for students with last names A-M) must cancel her office hour today due to a missed airline flight on return from a conference. Please feel free to contact her with questions via e-mail over the weekend or early next week. ...
... Jacqueline-Marie (TA for students with last names A-M) must cancel her office hour today due to a missed airline flight on return from a conference. Please feel free to contact her with questions via e-mail over the weekend or early next week. ...
sex-linked genes
... 1. The sex-linked recessive phenotype will occur more frequently in males because they cannot hide it a second, dominant allele. 2. Females have two copies of these genes, so if one copy is the recessive allele, they may still have the dominant phenotype. 3. Heterozygous females are called carriers ...
... 1. The sex-linked recessive phenotype will occur more frequently in males because they cannot hide it a second, dominant allele. 2. Females have two copies of these genes, so if one copy is the recessive allele, they may still have the dominant phenotype. 3. Heterozygous females are called carriers ...
What biological theories have been proposed to explain gender
... By the end of today’s class, you should be able to: 1. describe the process of prenatal sex differentiation. 2. review evidence that supports genetic contributions to sex differences in psychological characteristics. 3. identify three classes of sex-related hormones. 4. review evidence that support ...
... By the end of today’s class, you should be able to: 1. describe the process of prenatal sex differentiation. 2. review evidence that supports genetic contributions to sex differences in psychological characteristics. 3. identify three classes of sex-related hormones. 4. review evidence that support ...
Speciation
... apples – Timing of development critical so as not to emerge during winter – That is, there is selection to be either one type or the other, not in between ...
... apples – Timing of development critical so as not to emerge during winter – That is, there is selection to be either one type or the other, not in between ...
Selection
... without being vulnerable to pathogens), you have to keep evolving new defenses. In this case there is frequency-dependent selection, where the common phenotype has a reduced fitness (pathogens will easily infect individuals who all have the same genes) and the rarer phenotype has an increased fitnes ...
... without being vulnerable to pathogens), you have to keep evolving new defenses. In this case there is frequency-dependent selection, where the common phenotype has a reduced fitness (pathogens will easily infect individuals who all have the same genes) and the rarer phenotype has an increased fitnes ...
Lecture 2a: Sex: Chromosomes
... Homogametic sex - that sex containing two like sex chromosomes. In most animals species these are females (XX); in butterflies and birds, ZZ males. Heterogametic sex - that sex containing two different sex chromosomes. In most animal species these are XY males. In butterflies and birds, ZW females; ...
... Homogametic sex - that sex containing two like sex chromosomes. In most animals species these are females (XX); in butterflies and birds, ZZ males. Heterogametic sex - that sex containing two different sex chromosomes. In most animal species these are XY males. In butterflies and birds, ZW females; ...
Practice Midterm Solutions
... 3. In humans, there is a dominant allele that causes vitiligo, where small-unpigmented spots appear on the body. Also, there is a recessive allele for another gene that causes albinism, which causes the entire body to be unpigmented. Vitiligo cannot be seen in albinos. A man with vitiligo had an alb ...
... 3. In humans, there is a dominant allele that causes vitiligo, where small-unpigmented spots appear on the body. Also, there is a recessive allele for another gene that causes albinism, which causes the entire body to be unpigmented. Vitiligo cannot be seen in albinos. A man with vitiligo had an alb ...
Mating Systems 1
... reproduction were shaped by two mechanisms: > Competition Between Males > Female Choice • The idea of female choice was not widely accepted until the 1970’s • Revived by Gordan Orians and Robert Trivers, among others (Trivers’ Social Evolution) • There are several possible explanations for why femal ...
... reproduction were shaped by two mechanisms: > Competition Between Males > Female Choice • The idea of female choice was not widely accepted until the 1970’s • Revived by Gordan Orians and Robert Trivers, among others (Trivers’ Social Evolution) • There are several possible explanations for why femal ...
Human Inheritance
... Infants with PKU that drink milk rich in phenylalanine will have mental retardation Treated by altering the diet ...
... Infants with PKU that drink milk rich in phenylalanine will have mental retardation Treated by altering the diet ...
click here
... 1. RrLl x RrLl What fraction are purple and long? (½ Rr)(¼ LL) = ⅛ RrLL Ans: (b) 2. In this cross, we see that the inheritance pattern in the F1 shows a ‘criss-cross’ similar to that observed for the white eye phenotype in Drosophila- only the sexes are reversedyellow males give rise only to green f ...
... 1. RrLl x RrLl What fraction are purple and long? (½ Rr)(¼ LL) = ⅛ RrLL Ans: (b) 2. In this cross, we see that the inheritance pattern in the F1 shows a ‘criss-cross’ similar to that observed for the white eye phenotype in Drosophila- only the sexes are reversedyellow males give rise only to green f ...
breeding systems and reproductive strategies of mammals
... • Description of mating behavior and parental care by both sexes • Parental care & potential rate of reproduction of each sex • If males contribute no parental care (many mammals), they have high potential rate of reproduction; fitness limited by access to females; males most competitive sex ...
... • Description of mating behavior and parental care by both sexes • Parental care & potential rate of reproduction of each sex • If males contribute no parental care (many mammals), they have high potential rate of reproduction; fitness limited by access to females; males most competitive sex ...
Natural Selection Notes
... D. Over time certain variations make up most of a population & they may be different from their ancestors ...
... D. Over time certain variations make up most of a population & they may be different from their ancestors ...
Males
... About one male in every 10 000 has hemophilia, but only about one in 100 million females. If a mother is a carrier for hemophelia but does not have the disease (heterozygous) and she has childrent with a father that does not have the disease, what are the chances that their child with have hemop ...
... About one male in every 10 000 has hemophilia, but only about one in 100 million females. If a mother is a carrier for hemophelia but does not have the disease (heterozygous) and she has childrent with a father that does not have the disease, what are the chances that their child with have hemop ...
Chapter 15 practice Questions AP Biology
... E) 100% Refer to the following information to answer the questions below. An achondroplastic male dwarf with normal vision marries a color-blind woman of normal height. The man's father was sixfeet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal domin ...
... E) 100% Refer to the following information to answer the questions below. An achondroplastic male dwarf with normal vision marries a color-blind woman of normal height. The man's father was sixfeet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal domin ...
Inheritance related to Gender Determination
... In grasshoppers and related insects A single sex chromosome (X) Females are have two copies of the X chromosome (XX); each ovum produced will carry an X chromosome (females are homogametous) Males have only one copy of X, and no other sex chromosome (XO); half the sperm carry an X, and the other hal ...
... In grasshoppers and related insects A single sex chromosome (X) Females are have two copies of the X chromosome (XX); each ovum produced will carry an X chromosome (females are homogametous) Males have only one copy of X, and no other sex chromosome (XO); half the sperm carry an X, and the other hal ...
3. Identification of species, sex and individuals
... – To test the theory, paternity must be known ...
... – To test the theory, paternity must be known ...
the endocrine system
... Puberty -physical changes that mark the transition from childhood to young adulthood. two general types of physical development - bodily changes and sexual maturation Biggest growth spurt–starts at 11 Adult stature @ 15 years for females, 17 for males gender differences – females more fat, ...
... Puberty -physical changes that mark the transition from childhood to young adulthood. two general types of physical development - bodily changes and sexual maturation Biggest growth spurt–starts at 11 Adult stature @ 15 years for females, 17 for males gender differences – females more fat, ...
Evolution exam 1 File
... D When crossing over occurs, offspring can end up with different combinations of alleles on chromosomes than are found in either parent. E Can arise through sexual reproduction. ...
... D When crossing over occurs, offspring can end up with different combinations of alleles on chromosomes than are found in either parent. E Can arise through sexual reproduction. ...
artificial selection
... affecting other traits. In general, the former are of more interest to researchers. 4) AS experiments are often carried out with relatively small population sizes so that chance random associations may well be present. One check on this is to use replicated lines within each selection regime. If rep ...
... affecting other traits. In general, the former are of more interest to researchers. 4) AS experiments are often carried out with relatively small population sizes so that chance random associations may well be present. One check on this is to use replicated lines within each selection regime. If rep ...
Audrianna
... Why ‘worry’ about reproductive behaviors? o Sex/love: at the bases of many social interactions. At the bases of Art production (literature, painting…) o Sexual behavior (sex) vs Sexual experience (emotion): Two different (interacting) neural systems. Consequences: Physical and psychological o Sexual ...
... Why ‘worry’ about reproductive behaviors? o Sex/love: at the bases of many social interactions. At the bases of Art production (literature, painting…) o Sexual behavior (sex) vs Sexual experience (emotion): Two different (interacting) neural systems. Consequences: Physical and psychological o Sexual ...
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.