Sixteen-year-old Rhapsody has just learned that her younger brother Clyde is colorblind. Although she knows she has color vision because her cat, Juice, is clearly orange, and she reads that nearly all people with colorblindness are boys, she is concerned about her own sons one day. If she is a carrier for colorblindness, then the risk that a son of hers is colorblind is
A) dependent on the genes the child's father contributes.
B) 1/8.
C) 1/4.
D) 1/2.
D) 1/2.
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In a certain breed of chicken, an incomplete dominant gene controls color. The homozygous black (BB), when crossed
with the homozygous splashed-white (bb), produces an intermediate gray color pattern referred to as blue. A second gene controls the shape of the comb. The dominant allele (R) produces rose, whereas the recessive allele (r) produces single. Give the F1 and F2 genotypic and phenotypic ratios of a cross between a true-breeding black with a single comb and a true-breeding splashed-white with a rose comb. What will be an ideal response?
The daughter chromatids are separated and pulled to their respective poles during ________ of mitosis.
Fill in the blank(s) with the appropriate word(s).
Your tongue does NOT grow hair because
A) skin cells have extra DNA that codes for hair proteins. B) the genes for hair proteins have been deleted from the cells of your tongue. C) saliva prevents hair from growing. D) different genes are expressed in different tissues.
What is the enzyme used in DNA replication that unwinds the supercoiled, packaged DNA
What will be an ideal response?