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Question: 1 consider three yellow round peas labeled a b and...

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1. Consider three yellow, round peas, labeled A, B, and C. Each was grown into a plant and crossed to a plant grown from a green, wrinkled pea. Exactly 100 peas derived from each cross were sorted into phenotypic classes as follows:
A: 51 yellow, round
49 green, round

B: 100 yellow, round

C: 24 yellow, round
26 yellow, wrinkled
25 green, round
25 green, wrinkled

What are the genotypes of plants A, B, and C? (Use gene symbols of your own choosing; be sure to define each one.)
  
2. Identical twins are produced from the same sperm and egg (which splits after the first mitotic division), whereas fraternal twins are produced from separate sperm and separate egg cells. If two parents with brown eyes (a dominant trait) produce one twin boy with blue eyes, what are the following probabilities?
A. If the other twin is identical, he will have blue eyes.
B. If the other twin is fraternal, he or she will have blue eyes.
C. If the other twin is fraternal, he or she will transmit the blue eye allele to his or her offspring.
D. The parents are both heterozygotes




3. Beetles of a certain species may have green, blue, or turquoise wing covers. Virgin beetles were selected from a polymorphic (i.e. not a true-breeding stock) laboratory population and mated to determine the inheritance of wing-cover color. The crosses and results were as follows:

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