Question

if two pea plants are crossed that have this genotype/phenotype, what will be the phenotype percentage of their possible offspring? yg yellow × yg yellow. options: 75% yellow; 25% green, 100% yellow; 0% green, 50% yellow; 50% green, 25% yellow; 75% green

Explanation:

Step1: Identify the cross type

We have a cross between two heterozygous pea plants (Yg × Yg), where Y is the dominant allele for yellow and g is the recessive allele for green.

Step2: Use a Punnett square

	Y	g
g	Yg	gg

From the Punnett square, we have 4 possible genotypes: YY, Yg, Yg, gg.

Step3: Determine phenotypes

• YY and Yg (3 out of 4) show the yellow phenotype (since Y is dominant).
• gg (1 out of 4) shows the green phenotype.

Step4: Calculate percentages

• Yellow: $\frac{3}{4} \times 100\% = 75\%$
• Green: $\frac{1}{4} \times 100\% = 25\%$

Answer:

75% yellow; 25% green