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5. When two red-spotted tribbles are crossed, 9 of their offspring are red-spotted, 3 are solid...

5. When two red-spotted tribbles are crossed, 9 of their offspring are red-spotted, 3 are solid red, and 4 are solid white.

Two of the solid white tribbles are crossed with a solid red tribble and produce 1/2 solid red tribbles and 1/2 red-spotted tribbles.

One of the solid white tribbles when crossed with a solid red tribble produces only solid red tribbles.

A) List the alleles in this problem, then draw a punnette square that shows the original cross in this problem.

B) Explain why some of the white tribbles appeared solid even though they had the dominant spotted allele.

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Answer #1

Red spotted = 9 = Rr
Solid red = 3 = RR
Solid white = 4 = rr

A) The original alleles are RR for red solid and rr for solid white and Rr for the red spots on white

Punette square : ratio of phenotypes = 1:2:1

R r
R RR Rr
r Rr rr


Now when rr is crossed with RR : ratio of phenotypes = 1

R R
r Rr Rr
r Rr Rr

B) Some of the white tribbles appear solid because of the recessive epistasis. The red spotted tribble is dominant but the solid colored tribble had inherited two of the genetic component during the initial cross and therefore, there is a recessive epistatic phenomenon that has masked the effect of the dominant spotted allele.

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