Consider a gene that has two alleles and shows complete dominance. When two heterozygotes for this gene breed, they have a 25% chance of producing a homozygous recessive offspring. The next time they breed, what are the chances that they will once again have a homozygous recessive progeny?

In a particular plant, two genes control leaf shape and color. Round leaves (R) are dominant to jagged leaves (r). Yellow fruits (Y) are dominant to white fruits (y). A true-breeding round-leaved, yellow-fruited plant is mated with a jagged-leaved, white-fruited plant. What are the genotypes of the plants involved in this cross ?

The exposure of X-rays enhances the frequency of

In the F₂ generation of a dihybrid cross between yellow, round seeded and green, wrinkled seeded pea plants, 17 out of 254 pea seeds were green and wrinkled. Other seeds were:Yellow and round; green and round; yellow and wrinkled.What do these results indicate ?

Why is the allele for wrinkled seed shape in garden peas considered recessive ?

The alleles found in haploid organisms cannot be dominantor recessive. Why ?

Mendel’s rules do not correctly predict patterns of inheritance for tightly linked genes or the inheritance of alleles that show in complete dominance or epistasis. Does this mean that hishypothesis are incorrect ?

Linkage reduces the frequency of

It would have been very difficult for Mendel to draw conclusions about the patterns of inheritance if he had used cattle instead of peas. Why ?

In fruit flies, dumpy wings are shorter and broader than normal wings. The allele for normal wings (D) is dominant to the allele for dumpy wings (d). Two normal-winged flies were mated and produced 300 normal-winged and 100 dumpy-winged flies. The parents were probably