Female modulation of reproductive rate and its role in postmating
... females showed the lowest remating rate (35·02%). The females’ first mate had no significant influence on a female’s propensity to subsequently remate, while the second male did have such an effect. Female remating rates were 43·30% when the second male was of her own type; 52·42% when the second ma ...
... females showed the lowest remating rate (35·02%). The females’ first mate had no significant influence on a female’s propensity to subsequently remate, while the second male did have such an effect. Female remating rates were 43·30% when the second male was of her own type; 52·42% when the second ma ...
Exercise #1 - UBC Zoology
... the female and the terminal cartilage is spread by muscle to hold it firmly in place. Sperm are flushed along a groove in the clasper or gonopodium into the female by water from a siphon sac in the male. Fertilization in most frogs is external. Usually it occurs in water. Most salamanders, on the ot ...
... the female and the terminal cartilage is spread by muscle to hold it firmly in place. Sperm are flushed along a groove in the clasper or gonopodium into the female by water from a siphon sac in the male. Fertilization in most frogs is external. Usually it occurs in water. Most salamanders, on the ot ...
Patterns of sexual dimorphism in Mexican alligator lizards, Barisia
... sexual dimorphism observed in head length. Several studies have found a correlation between male-male combat and sexually dimorphic head size in lizards, potentially due to the advantage greater bite force confers during competition (e.g., Carothers 1984; Herrel et al. 2010; Vanhooydonck et al. 2010 ...
... sexual dimorphism observed in head length. Several studies have found a correlation between male-male combat and sexually dimorphic head size in lizards, potentially due to the advantage greater bite force confers during competition (e.g., Carothers 1984; Herrel et al. 2010; Vanhooydonck et al. 2010 ...
5.4 Asexual Reproduction
... Asexually reproduced offspring are genetically identical— so they will respond to their environment in the same way. If conditions stay the same, this is not a problem. If the environment changes, and the organisms cannot live with the changes, the entire population could die off. In contrast, offsp ...
... Asexually reproduced offspring are genetically identical— so they will respond to their environment in the same way. If conditions stay the same, this is not a problem. If the environment changes, and the organisms cannot live with the changes, the entire population could die off. In contrast, offsp ...
Sexual and Asexual Reproduction
... What is sexual reproduction? • When an egg is fertilized by a sperm cell, a new cell, called a zygote, is formed. It has a full set of genetic material (DNA). - half from the mother - half from the father • The zygote develops into a new organism. ...
... What is sexual reproduction? • When an egg is fertilized by a sperm cell, a new cell, called a zygote, is formed. It has a full set of genetic material (DNA). - half from the mother - half from the father • The zygote develops into a new organism. ...
biology - westminster.org.uk
... decreased from about 17 years to about 12 years of age. It has been suggested that a change to a higher fat diet is largely responsible for this decrease. With reference to the data in Fig. 4.1, evaluate the evidence that changes in diet may be responsible for this decrease in the age of onset of pu ...
... decreased from about 17 years to about 12 years of age. It has been suggested that a change to a higher fat diet is largely responsible for this decrease. With reference to the data in Fig. 4.1, evaluate the evidence that changes in diet may be responsible for this decrease in the age of onset of pu ...
Reproduction of Living Organisms
... Most aquatic animals reproduce by external fertilization (frogs, fish, etc.). ...
... Most aquatic animals reproduce by external fertilization (frogs, fish, etc.). ...
K and r selection activity
... Turtle Data.” If the data included only female sea turtles that lay eggs on the beach about 8 times a season every other year, what would its survivorship curve look like? Graph the expected curve and label this line “Female Sea Turtle Data.” When you have finished, turn in your work to be graded. ( ...
... Turtle Data.” If the data included only female sea turtles that lay eggs on the beach about 8 times a season every other year, what would its survivorship curve look like? Graph the expected curve and label this line “Female Sea Turtle Data.” When you have finished, turn in your work to be graded. ( ...
Invertebrates
... - Diversity in offspring > def. – Diversity - the relative uniqueness of each individual in the population ...
... - Diversity in offspring > def. – Diversity - the relative uniqueness of each individual in the population ...
Asexual & Sexual Reproduction
... Most unicellular organisms, and a few multicellular organisms use cell division to reproduce in a process called asexual reproduction. ...
... Most unicellular organisms, and a few multicellular organisms use cell division to reproduce in a process called asexual reproduction. ...
REPRODUCTION IN PLANTS 13 FEBRUARY 2013 Key Concepts
... Genetic variation occurs Reduces chances of parasites and diseases moving from parents to offspring New species can develop as a result of genetic variation (evolution) ...
... Genetic variation occurs Reduces chances of parasites and diseases moving from parents to offspring New species can develop as a result of genetic variation (evolution) ...
The Origin of Man Author(s): C. Owen Lovejoy Source: Science
... development of major adaptive trends. Figure 1 is a well-known diagram of the chronology of life phases in living primates. There is an obvious trend toward prolonged life-span, which has both physiological and demographic correlates bearing directly on the phyletic origin of hominids. The physiolog ...
... development of major adaptive trends. Figure 1 is a well-known diagram of the chronology of life phases in living primates. There is an obvious trend toward prolonged life-span, which has both physiological and demographic correlates bearing directly on the phyletic origin of hominids. The physiolog ...
Reproduction
... mosquitoes need the iron from your blood to produce eggs, which the male then fertilizes. • Most things that produces eggs reproduce through sexual reproduction. ...
... mosquitoes need the iron from your blood to produce eggs, which the male then fertilizes. • Most things that produces eggs reproduce through sexual reproduction. ...
Chapter 2 Parents & Offspring
... There are organisms that reproduce asexually in all six kingdoms. All members of the bacteria kingdom and most ...
... There are organisms that reproduce asexually in all six kingdoms. All members of the bacteria kingdom and most ...
Asexual vs. Sexual Reproduction
... The egg is fertilized by sperm outside the female The female lays the eggs and then the male fertilizes them. Fish and some amphibians Plants and fungi (pollen and spores) ...
... The egg is fertilized by sperm outside the female The female lays the eggs and then the male fertilizes them. Fish and some amphibians Plants and fungi (pollen and spores) ...
asexual reproduction
... elephants and whales, is to produce young. Animals need to reproduce to make sure that their species survives. There are two main aims in reproduction—to have as many young as possible and for those young to live long enough to reproduce themselves. To achieve these aims, some animals, such as many ...
... elephants and whales, is to produce young. Animals need to reproduce to make sure that their species survives. There are two main aims in reproduction—to have as many young as possible and for those young to live long enough to reproduce themselves. To achieve these aims, some animals, such as many ...
Answers Reproduction
... 13 Advantages of sexual reproduction: Because sexual reproduction is a mix of the genetic material of two parents, the offspring can show genetic variety. The genetic variety allows some individuals to better cope with unstable environments. This can help lower the chance of extinction. 14 The dis ...
... 13 Advantages of sexual reproduction: Because sexual reproduction is a mix of the genetic material of two parents, the offspring can show genetic variety. The genetic variety allows some individuals to better cope with unstable environments. This can help lower the chance of extinction. 14 The dis ...
Name: Date: Hour: _____ Directions: Use the specified book and
... After viewing the brain pop, and using what you have learned in these sections, answer the following question. The answer is not found in the reading, you need to use your critical thinking skills. 34. Twins come in two varieties, fraternal (not genetically identical) and identical (genetically iden ...
... After viewing the brain pop, and using what you have learned in these sections, answer the following question. The answer is not found in the reading, you need to use your critical thinking skills. 34. Twins come in two varieties, fraternal (not genetically identical) and identical (genetically iden ...
The Theory of Evolution: Of What Value to Psychology?
... example is the explanation of the excess in male versus female mortality, due to disease, trauma and stress, accidents, and murder, that occurs in humans and many other animals. Given that excess male mortality is not attributable to the unguarded X chromosome (Trivers, 1985), the theory of sensatio ...
... example is the explanation of the excess in male versus female mortality, due to disease, trauma and stress, accidents, and murder, that occurs in humans and many other animals. Given that excess male mortality is not attributable to the unguarded X chromosome (Trivers, 1985), the theory of sensatio ...
Reproduction
... Reproduction – the process of living things producing the same type of living thing. Examples – horses produce horses, humans produce humans, and tomato plants produce tomatoes. * Like produces like. There are two types of reproduction: asexual and sexual ...
... Reproduction – the process of living things producing the same type of living thing. Examples – horses produce horses, humans produce humans, and tomato plants produce tomatoes. * Like produces like. There are two types of reproduction: asexual and sexual ...
Asexual and Sexual Reproduction
... A single-celled organism that has no nuclei or cell walls and reproduce by splitting in two. Spider plants reproduce new plants by the division of cells from roots or runners. These can be placed in water or soil to produce another plant. Spider plants also reproduce sexually. Strawberries reproduce ...
... A single-celled organism that has no nuclei or cell walls and reproduce by splitting in two. Spider plants reproduce new plants by the division of cells from roots or runners. These can be placed in water or soil to produce another plant. Spider plants also reproduce sexually. Strawberries reproduce ...
Parental investment
Parental investment (PI), in evolutionary biology and evolutionary psychology, is any parental expenditure (time, energy etc.) that benefits one offspring at a cost to parents' ability to invest in other components of fitness, and is thus a form of sexual selection. Components of fitness include the wellbeing of existing offspring, parents' future sexual reproduction, and inclusive fitness through aid to kin. Parental investment may be performed by both the male and female (biparental care), the mother alone (exclusive maternal care) or the father alone (exclusive paternal care).Initially introduced in 1930 by the English biologist and statistician Ronald Fisher, parental care is found in a broad range of taxonomic groups, including both ectothermic (invertebrates, fish, amphibians and reptiles), and endothermic (birds and mammals) species. Care can be provided at any stage of the offspring's life: pre-natal care including behaviours such as egg guarding, preparation of nest, brood carrying, incubation, and placental nourishment in mammals; and post-natal care including food provisioning and protection of offspring.