What fraction of the offspring from a SsYy x SsYy cross are predicted to be heterozygous for both characteristics?

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Multiple Choice

What fraction of the offspring from a SsYy x SsYy cross are predicted to be heterozygous for both characteristics?

To determine the fraction of offspring from a cross between two individuals, each with the genotype SsYy, that are heterozygous for both characteristics, we can approach this with a Punnett square analysis. In this cross, SsYy indicates that each parent carries one allele for each gene: S (dominant), s (recessive) for the first trait, and Y (dominant), y (recessive) for the second trait. The possible gametes produced by each parent can be listed as SY, Sy, sY, and sy. When we create a Punnett square combining these gametes, we will have the following combinations of genotypes for the offspring: - SSYY - SSYy - SsYY - SsYy - SsYy - sSYy - ssYY - ssYy - ssYy - syy From the completed Punnett square, we can count how many offspring are heterozygous for both traits. The heterozygous combinations are SsYy (which appears twice), meaning there are 3 occurrences out of a total of 16 possible combinations. Consequently, the fraction of the offspring that are

To determine the fraction of offspring from a cross between two individuals, each with the genotype SsYy, that are heterozygous for both characteristics, we can approach this with a Punnett square analysis.

In this cross, SsYy indicates that each parent carries one allele for each gene: S (dominant), s (recessive) for the first trait, and Y (dominant), y (recessive) for the second trait. The possible gametes produced by each parent can be listed as SY, Sy, sY, and sy.

When we create a Punnett square combining these gametes, we will have the following combinations of genotypes for the offspring:

  • SSYY

  • SSYy

  • SsYY

  • SsYy

  • SsYy

  • sSYy

  • ssYY

  • ssYy

  • ssYy

  • syy

From the completed Punnett square, we can count how many offspring are heterozygous for both traits. The heterozygous combinations are SsYy (which appears twice), meaning there are 3 occurrences out of a total of 16 possible combinations.

Consequently, the fraction of the offspring that are

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