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A:
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- What mechanism do mammals use to compensate for the difference in X chromosome numbers in females versus males?what is the chromosomal system for determining sex in mammals?Mate guarding is an evolved response to sperm competition. Chimpanzee (Pan troglodytes) females regularly mate with several males in the same estrous cycle, whereas gorilla (Gorilla gorilla) females almost never do, since they typically live in bands, each controlled by a single, powerful male. How large (as a proportion of body size) should the testes of chimpanzee males be relative to gorilla testes (Harcourt et al. 1981)? If the testes of men are more similar to those of chimpanzees, what would this tell us about the intensity of sperm competition during our evolutionary past? If, on the other hand, human testes resemble those of gorillas, what conclusion is justified? Please don't write from any online source.
- Give account of events that occur following mating and before the onset of cleavage in mammalsDescribe the process of germ cells migration in mammals.To mate Drosophila for a lab experiment, you need? 1) virgin female 2)virgin male 3)both male and female have to be virgins 4)either of them need to be virgins
- In honey bees, males are developed parthenogenetically while workers are developed after sexual reproduction. The workers exhibit more similarity among themselves as compared to the queen. If the workers start giving organism parthenogenetically then the offspring would most likely resemble:Explain why sexually reproducing organisms are often better suited to changes in their environment than asexually reproducing organisms.Write a conclusion for pig Xenotransplantation.
- Describe the biological basis for the 1 : 1 ratio of malesand females at conception in mammals.How do you expect Kartagener syndrome leads to infertility? A. The lack of a plasma membrane means that pathogens and foreign substances can permeate the sperm and damage the DNA B. The lack of microtubules mean the sperm do not have tails and cannot swim to fertilize the egg C. The lack of dynein means that the sperm cannot bend their tails to swim and fertilize the eggExplain the advantage that populations of sexually reproducing organisms have over asexually reproducing organisms?