Describe the role of the following structures or proteins in cell division:
Cohesin protein

Alleles A and a are on one pair of autosomes, and alleles B and b are on a separate pair of autosomes. Does crossover between one pair of homologs affect the expected proportions of gamete genotypes? Why or why not? Does crossover between both pairs of chromosomes affect the expected gamete proportions? Why or why not?

How many Barr bodies are found in a normal human female nucleus? In a normal male nucleus?

Describe the role of the following structures or proteins in cell division:

Microtubules

Describe the role of the following structures or proteins in cell division:

Kinetochores

Describe the role of the following structures or proteins in cell division:

Synaptonemal complex

A woman's father has ornithine transcarbamylase deficiency (OTD), an X-linked recessive disorder producing mental deterioration if not properly treated. The woman's mother is homozygous for the wild-type allele.

What is the woman's genotype? (Use D to represent the dominant allele and d to represent the recessive allele.)