Exam 4: The Chromosome Theory of Inheritance

Nondisjunction can occur at either the first or second division of meiosis.XXY individuals could arise from nondisjunction at the ______ meiotic division in the ______.

Which sex chromosomes are limited to only one sex?

In Drosophila virilis, nuclei of somatic cells contain 12 chromosomes while nuclei of sperm cells contain only 6 chromosomes.What does "n" equal for this species?

Suppose you discover a new variant in which mice have spiky fur instead of the usual soft fur.You notice that this trait seems only to be present in males.To investigate this pattern, you cross a spiky-fur male with a soft-fur female, and find that all of the F₁ progeny of both sexes have soft fur.You then interbreed the F₁ and observe that all of the F₂ females have soft fur, but 1/4 of the F₂ males have spiky fur.You conclude that the spiky allele is

If a geneticist were to closely examine the make-up of a single autosomal chromosome from one of your cells, that chromosome would be found to be

At which phase of the cell cycle are sister chromatids generated?

Cells said to be in the G₀ stage

In the following pedigree, the indicated trait is caused by which type of allele?

The mitotic stage during which chromosomes begin attaching to spindle fibers and moving randomly and reversibly to the centrosomes is

In humans, XO individuals are females with Turner syndrome and XXY individuals are males with Klinefelter syndrome.Red green color blindness is caused by an X-linked recessive allele.Suppose a colorblind man and a normal woman with no family history of color blindness married and had a daughter who was colorblind and had Turner syndrome.Which event could have given rise to this offspring?