Questions 25 and 26 refer to the following scenario: In parakeets, two autosomal

Question

Questions 25 and 26 refer to the following scenario: In parakeets, two autosomal genes that are located on different chromosomes control the production of feather pigment. Gene locus B codes for an enzyme that is required for the synthesis of blue pigment. Gene locus Y codes for an enzyme required for the synthesis of a yellow pigment. Recessive, loss-of-function mutations are known for both genes. Thus, b codes for no blue pigment, and y codes for no yellow pigment.

Suppose that a bird breeder has two green parakeets and mates them. The offspring are green, blue, yellow, and albino (unpigmented).

25. What were the genotypes of the parents?
A) BbYY and Bbyy
B) BY and by
C) BbYy and BbYy
D) Bb and Yy
E) Can’t tell

26. What proportion of the offspring of this cross would you expect to be GREEN?

A) 9/16
B) 1/4
C) none
D) 1/16
E) Can’t tell

Explanation / Answer

E)Cant tell

As there is no information about Gg

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