When yellow mice are mated together, 2/3 of the progeny are yellow and 1/3 are a

Question

When yellow mice are mated together, 2/3 of the progeny are yellow and 1/3 are agouti. Another locus governs the ability to produce pigment; when parents heterozygous at this locus mate 3/4 of the progeny are colored and 1/4 are albino. Yellow mice are crossed with the albinos and produce an F1 containing 1/2 albinos, 1/3 yellow and 1/6 agouti.

What are the genotypes of the parents (use your own symbols)?
If the yellow F1 mice are crossed among themselves, what phenotypic ratio is expected among the offspring?

Explanation / Answer

CROSS BETWEEN HETEROZYGOUS YELLOW MICE

yellow mice(Yy) mated with Yy(yellow)

Progeny- agouti(yy), Yy(yellow), YY(yellow)

Therefore 2/3 rd are yellow 1/3(agouti)

Another locus governs pigment production,

Parents P1 YAya * YAya

Progeny (F1) YAYA   YAya are colored yaya(albino)

Cross between F1 progeny WHEN YAYA ARE CROSSED WITH   yaya

PROGENY PHENOTYPE WILL BE YAya(AGOUTI) ALL

Cross between F1 progeny WHEN YAYA  AND YAya  will produce progeny with phenotype  YAYA, YAya , BOTH YELLOW AND AGOUTI) in 50:50 RATIO

CROSS BETWEEN YELLOW AND ALBINO

Parents- YAyA * yaya

Progeney (F1) yay a (ALBINO) : YAYA( YELLOW) , YAya(agouti)

Genotypes of the parents are   YAyA * yaya

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