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The coat color in mink is controlled by two codominant alleles at a single locus. Red...

The coat color in mink is controlled by two codominant alleles at a single locus. Red coat color is produced by the genotype R1R1, silver coat by the genotype R1R2, and platinum color by R2R2. White spotting of the coat is a recessive trait found with the genotype ss. Solid coat color is found with the S- genotype. Two crosses are made between mink. Cross 1 is the cross of a solid, silver mink to one that is solid, platinum. Cross 2 is between a spotted, silver mink and one that is solid, silver. The progeny are described in the table below. Use these data to determine the genotypes of the parents in Cross 1.

Solutions

Expert Solution

R1R1- Red coat colour

R1R2- Silver coat colour

R2R2- Platinum colour

ss- white spotting

SS or Ss- Solid coat

Since there is no table, Let us assume the first condition in which solid is due to SS (homozygous condition)

Cross 1: SSR1R2 x SSR2R2

Gametes: SR1 SR2 SR2 SR2

Progeny:

SR1 SR2
SR2 SSR1R2 (Solid Silver) SSR2R2 (Solid Platinum)
SR2 SSR1R2 (Solid Silver) SSR2R2 (Solid Platinum)

Now consider if the Solid character is due to Ss (heterozygous condition), when both parents are heterozygous

SsR1R2 x SsR2R2

Gametes ----->   SR1 SR2 sR1 sR2 SR2 sR2

Progeny

SR1 SR2 sR1 sR2
SR2 SSR1R2 (Solid Silver) SSR2R2 (Solid Platinum) SsR1R2 (Solid Silver) SsR2R2 (Solid Platinum)
sR2 SsR1R2 (Solid Silver) SsR2R2 (Solid Platinum) ssR1R2 (White spotted Silver) ssR2R2 (White spotted Platinum)

Now consider if the Solid character is due to Ss (heterozygous condition) for one parent

SsR1R2 x SSR2R2

Gametes ----->   SR1 SR2 sR1 sR2 SR2 SR2

SR1 SR2 sR1 sR2
SR2 SSR1R2 (Solid Silver) SSR2R2 (Solid Platinum) SsR1R2 (Solid Silver) SsR2R2 (Solid Platinum)
SR2 SSR1R2 (Solid Silver) SSR2R2 (Solid Platinum) SsR1R2 (Solid Silver) SsR2R2 (Solid SPlatinum)

Now consider if the Solid character is due to Ss (heterozygous condition) for one parent

SSR1R2 x SsR2R2

Gametes -----> SR1 SR2    SR2 sR2

SR1 SR2
SR2 SSR1R2 (Solid Silver) SSR2R2 (Solid Platinum)
sR2 SsR1R2 (Solid Silver) SsR2R2 (Solid Platinum)

You can compare the results and get the genotypes of the parents.

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gladiator answered 2 years ago
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