drosophila eye color is an x - linked trait. red eye color is dominant, and white eye color is recessive…

drosophila eye color is an x - linked trait. red eye color is dominant, and white eye color is recessive. which punnett square shows a cross in which the probability that offspring will be red - eyed males is 25 percent?

drosophila eye color is an x - linked trait. red eye color is dominant, and white eye color is recessive. which punnett square shows a cross in which the probability that offspring will be red - eyed males is 25 percent?

Answer

Explanation:

Step1: Analyze X - linked inheritance

In X - linked inheritance, males have XY chromosomes and females have XX chromosomes. Red eye color ($X^R$) is dominant and white eye color ($X^r$) is recessive.

Step2: Calculate probabilities for each cross

For the first Punnett - square shown: The cross is $X^R X^R\times X^rY$. The possible genotypes of offspring are $X^R X^r$ (female, red - eyed) and $X^R Y$ (male, red - eyed). The probability of red - eyed males is 50% since half of the offspring are $X^R Y$. For the second Punnett - square shown: The cross is $X^R X^r\times X^rY$. The possible genotypes of offspring are $X^R X^r$ (female, red - eyed), $X^r X^r$ (female, white - eyed), $X^R Y$ (male, red - eyed), $X^r Y$ (male, white - eyed). There are 4 possible genotypes of offspring, and the probability of red - eyed males ($X^R Y$) is $\frac{1}{4}=25%$.

Answer:

The second Punnett - square (the cross $X^R X^r\times X^rY$)