Comb shape in chickens represents one of the classic examples of gene interaction. Two gene pairs interact to influence the shape of the comb. The genes for rose comb (R) and pea comb (P) together produce walnut comb. The fully homozygous recessive
condition (rrpp) produces the single comb. Assume that a rose-comb chicken is crossed with a walnut-comb chicken and the following offspring are produced: 17 walnut, 16 rose, 7 pea, and 6 single. What are the probable genotypes of the parents?
A) rrPP × RRpp
B) rrpp × RrPp
C) Rrpp × RrPp
D) RRPP × Rrpp
E) RrPp × RRPP
Answer: C
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What information is provided by the fossil record that cannot be provided by examining living organisms?
A. All of the answer options are correct. B. a record of extinct species C. absolute dates for when different taxa diverged D. records of environmental conditions E. timing of mass extinctions
During apoptosis, a cell will
A. die because it is damaged and, as a result, cause an inflammatory response. B. self-destruct and, as a result, cause an inflammatory response. C. self-destruct without causing an inflammatory response. D. die because it is accidentally damaged, and, as a result, cause an inflammatory response.
Assuming independent assortment, what proportion of the offspring of the cross AaBbCcDd × AabbCCdd will have the aabbccdd genotype?
What will be an ideal response?
Which term corresponds to 2?
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