In a certain breed of chicken, an incomplete
dominant gene controls color. The homozygous
black, when crossed with the homozygous splashedwhite,
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?
Answer: 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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The process of gene duplication and divergence refers to (select all that apply):
A. creating new genes via mutation in duplicates of old genes. B. the creation of gene families, which are genes that are similar across a range of organisms. C. offspring becoming increasingly different from their ancestors. D. the creation of new species as new genes are created from duplicates of old genes. E. None of the answer options are correct.
The only way to meet the resource needs of future generations is through ____
a. sustainable resource use b. biological magnification c. creating conservation hotspots d. clear cutting and mining
e. increasing use of nonrenewable resourcesThe movement that increases the angle between two bones is called
a. supination. b. pronation. c. flexion. d. extension. e. adduction.
The disease, sickle-cell anemia is common in malaria-infested areas because individuals that are heterozygous for the gene (AS) have enhanced resistance to malaria over normal individuals (AA). Individuals with severe sickle-cell anemia (SS) usually die before reproduction. If this population moves to an area without malaria, what will happen to the allele frequency of the A allele over time?
A. It will go up because there is no sickle cell anemia. B. It will go up because there is no malaria. C. It will go down because there is no malaria. D. It will go down because there is no sickle cell anemia.