In a pea plant that is heterozygous for seed shape and color, what is the expected gamete distribution?

In a pea plant that is heterozygous for seed shape and color, what is the expected gamete distribution?

• A. 50% SY, 50% sy
• B. 25% SY, 25% Sy, 25% sY, 25% sy
• C. 100% SY
• D. 75% SY, 25% sy

Answer: (B)

In a pea plant that is heterozygous for two traits, such as seed shape and color, we can use a Punnett square to determine the expected gamete distribution. The notation for heterozygous traits is typically represented as "Ss" for seed shape (S = round, s = wrinkled) and "Yy" for seed color (Y = yellow, y = green). When a plant is heterozygous for both traits, it would have the genotype "SsYy." Each gamete produced by this plant can contain one allele for each trait. The potential alleles for seed shape are "S" or "s," and for seed color, they are "Y" or "y." To find the combination of alleles in the gametes, we can list the combinations that result: 1. SY (dominant seed shape and color) 2. Sy (dominant seed shape and recessive color) 3. sY (recessive seed shape and dominant color) 4. sy (recessive seed shape and color) Since there are four different combinations of alleles that can result from the heterozygous genotype, and each of these combinations occurs with equal probability

In a pea plant that is heterozygous for two traits, such as seed shape and color, we can use a Punnett square to determine the expected gamete distribution. The notation for heterozygous traits is typically represented as "Ss" for seed shape (S = round, s = wrinkled) and "Yy" for seed color (Y = yellow, y = green).

When a plant is heterozygous for both traits, it would have the genotype "SsYy." Each gamete produced by this plant can contain one allele for each trait. The potential alleles for seed shape are "S" or "s," and for seed color, they are "Y" or "y."

To find the combination of alleles in the gametes, we can list the combinations that result:

1. SY (dominant seed shape and color)

2. Sy (dominant seed shape and recessive color)

3. sY (recessive seed shape and dominant color)

4. sy (recessive seed shape and color)

Since there are four different combinations of alleles that can result from the heterozygous genotype, and each of these combinations occurs with equal probability