In a certain breed of chicken, an incomplete dominant gene controls color. The homozygous black,
when crossed with the homozygous splashed-white, 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 pure-breeding black single and a pure-breeding splashed-white rose. What will be an ideal response?
F1: Bb Rr blue rose; F2: 3 BB R__ black rose, 6 Bb R__ blue rose, 3 bb R__ splashed-white rose, 1 BB
rr black single, 2 Bb rr blue single, 1 bb rr splashed-white single
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Which of the following is not true of the transcription-activation domains of transcriptional activators?
A. Many are composed of acidic, proline-rich, or glutamine-rich regions. B. They are thought to be relatively unstructured. C. These domains are likely to interact with DNA. D. These domains interact with other proteins.
A deficiency of T-helper cells would affect both cell-mediated immunity as well as antibody production.
Answer the following statement true (T) or false (F)
The connection between unpasteurized milk and brucellosis in humans was made by
A. Evans. B. Pasteur. C. Koch. D. Fleming
Which of the following structures is unpaired?
A) seminal vesicle B) ovary C) bulbourethral gland D) prostate gland