Question

The result of the following cross indicates the orange eyes are _____ black eyes. A cross between two aliens with black eyes. Their offspring have two phenotypes. 247 of them have black eyes, 86 of them are orange-eyed. The total number of the offspring is 333.

Answer 1

Answer:

The result of the following cross indicates the orange eyes are recessive to black eyes

Explanation:

According to Mendel, a cross involving two individuals that are heterozygous for a dominant trait will yield offspring in the phenotype ratio 3:1 with the dominant trait accounting for about 75% of the phenotype and the recessive trait accounting for the remaining 25%.

In this case, black eye colour phenotype is 247 while orange eye colour phenotype is 86.

Calculating the percentage for each trait

Black eye = 247/333 x 100% = 74.1%

Orange eye = 86/333 x 100% = 25.8%

74.1:25.8 is approximately 3:1

Hence, it is obvious that the orange eyes are recessive while the black eyes are dominant.