AP BIOLOGY

Detailed explanation-1: -Therefore, the “cross” is Bb x bb; half the children from such a cross are expected to show the dominant (brown-eyed) phenotype.

Detailed explanation-2: -Thus, a cross between BB x bb yields 100% Bb progeny. However, as big B is dominate to little b, then 100% of the progeny will resemble the BB parent. In other words, if B stands for brown eye color and b stands for blue eye color, then all progeny will have brown eye color.

Detailed explanation-3: -Predicting Offspring Genotypes In the cross shown in Figure above, you can see that one out of four offspring (25 percent) has the genotype BB, one out of four (25 percent) has the genotype bb, and two out of four (50 percent) have the genotype Bb.

Detailed explanation-4: -If we cross two heterozygous individuals (Aa), then the percentage of offsprings with recessive phenotype will be: Aa x Aa = AA Aa Aa aa, so recessive phenotypes would be 1/4 = 25%.