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A pet shop is breeding neon tetra fish and find some interesting color phenotypes.

1. The breeder crosses a true-breeding red neon tetra to a true-breeding yellow neon tetra and finds that all F1 progeny are red. Crossing two F1 red neon tetras results in the following numbers of progeny: 36 Red neon tetras, 3 Yellow neon tetras, and 9 Orange neon tetras. How many genes are involved in neon tetra coloration?

a. 1

b. 2

c. 3

d. 4

e. Cannot be determined from the information given

2. Which of the following genotypes produce Red neon tetras?

a A_ B_
b. A_ bb
c. aa B_
d. aa bb
e. Both A_ B_ and aa B_ genotypes
f. Both A_ bb and aa B_ genotypes
g.

None of the above

3. If a Red F2 neon tetra is crossed to a Yellow F2 neon tetra, what is the probability that they will produce Orange offspring?

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Elin Hessel
Elin HesselLv2
28 Sep 2019

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