Question

Start with the P generation with the following genotypes (AA x aa). Based on classical Mendelian inheritance, how will a cross between two homozygous parents, one dominant and one recessive, influence future generations?
A. The F1 generation will show an even split between the dominant phenotype and the recessive phenotype.

B. The F1 generation will all show the dominant trait and future crosses will continue to produce genotypes expressing the dominant trait.

C. Although the F1 generation will all show the dominant trait, the offspring will all be heterozygous and increase chances of future variation.

D. The F1 generation will show a mix of the dominant phenotype and recessive phenotype and over generations the recessive trait will increase in number

Answer 1

The answer is c.
on the first generation every trait should be dominant, and as generations pass down the trait, the recessive trait will show, showing more variation.

Answer 2

Answer: The correct answer is C) Although the F1 generation will all show the dominant trait, the offspring will all be heterozygous and increase chances of future variation.

According to Mendelian inheritance, true breeding parents ( which are homozygous dominant and homozygous recessive) for dominant and recessive allele will always result into offsprings with heterozygous dominant genotype.

As per the question, genotype of P ( parental ) generation is AA and aa. When they are crossed together, they result into Aa offsprings, which all exhibit dominant character/ phenotype. These offsprings will increase the chances of future variation.