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- Why do you think theheterozygote offspring of two Manx catssurvives with developmental abnormalities,whereas the homozygote diesPlants and animals are both capable of reproducing asexually. In which typesof asexual reproduction are common to both organisms?How does the role of meiosis in gamete production differ between organisms with a diploid-dominant life cycle and organisms with an alternation of generations life cycle?
- . In a certain strain of turkeys, unfertilized eggs sometimes develop parthenogenetically to produce diploidoffspring. (Females have ZW and males have ZZ sexchromosomes. Assume that WW cells are inviable.)What distribution of sexes would you expect to seeamong the parthenogenetic offspring according toeach of the following models for how parthenogenesisoccurs?a. The eggs develop from oogonial cells that neverundergo meiosis.b. The eggs go all the way through meiosis and thenduplicate their chromosomes to become diploid.c. The eggs go through meiosis I, and the chromatidsseparate to create diploidy.d. The egg goes all the way through meiosis and thenfuses at random with one of its three polar bodies(this scenario assumes the first polar body goesthrough meiosis II).Why are the offspring of a male and a hermaphrodite more variablethan the offspring of a self-reproducing hermaphrodite?How many chromosomesdoes a human normal haploidcell have? How many chromosomes does a human normal diploid cell have? How many are the sexchromosomes within each ofthem?
- Examine the attached fig, which shows oogenesis in animalcells. Will the genotype of the second polar body (derivedfrom meiosis II) always be identical to that of the ootid?Why or why not?Nine-banded armadillos almost always give birth to four offspringthat are genetically identical quadruplets. Explain how you thinkthis happens.How Do Meiosis and Union of Gametes Produce Genetically Variable Ofspring?
- How does distribution of the gray crescent affectthe developmental potential of the first two daughter cells?The process of oogenesis is often described as theproduction of a haploid egg by meiosis, but in someanimals, including humans, this description is notentirely accurate. Explain.Each sperm of a pea plant contain seven chromosomes. What are the haploid and diploids for this species?