Exam 2: Mendels Principles of Heredity

In some genetically engineered corn plants the dominant gene Bt produces a protein that is lethal to certain flying insect pests that eat the corn plants.If the corn plant is heterozygous for Bt, what proportion of the pollen would carry the dominant gene?

In a monohybrid cross AA * aa, what proportion of homozygotes is expected among the F₂ offspring?

If a plant homozygous for liguleless and green leaves is crossed to one homozygous for non-green with ligules, predict the phenotypes and genotypes of the F₁.

Suppose that in plants, smooth seeds (S) are dominant to wrinkled seeds (s) and tall plants (T) are dominant to short plants (t).A tall plant with smooth seeds was backcrossed to a parent that was short and wrinkled.What proportion of the progeny is expected to be homozygous for short and wrinkled?

What does the pattern of inheritance in this pedigree indicate about the disease allele?

What was the importance of Mendel performing reciprocal crosses?

Among the dihybrid crosses below, which will produce a 1:1 phenotypic ratio?

If an Ss* Ss mating is performed and the progeny have the following phenotypic ratios S- (- indicates that the other allele is unknown) 3 and ss 1 it would indicate that

An alternative form of a single gene is known as

A phenotype reflecting a new combination of genes occurring during gamete formation is called