Genetics worksheet with answers

Two Aa parents are crossed. A gives black fur and is dominant over a, which gives white fur. Click the cell of the Punnett square for an offspring with white fur.

1. 1a × a
2. 2a × A
3. 3A × a
4. 4A × A

Two Bb parents are crossed. B gives purple flowers and is dominant over b, which gives white flowers. Click the cell of the Punnett square for an offspring with white flowers.

1. 1B × b
2. 2B × B
3. 3b × b
4. 4b × B

Duchenne muscular dystrophy is X-linked recessive (allele d). A carrier mother, X^DX^d, has children with an unaffected father, X^DY. The mother's gametes run down the side. Click the cell for a carrier daughter.

1. 1X^D × X^D
2. 2X^D × Y
3. 3X^d × X^D
4. 4X^d × Y

Tall (A) is dominant over short (a), and round seeds (B) over wrinkled (b). The genes are on different chromosomes. For the cross AaBb × aaBb, what is the probability P that an offspring is short, round seeds?

In a population of 10000 in Hardy–Weinberg equilibrium, 1 in 10000 show a recessive trait. How many individuals N are expected to be homozygous dominant?

A recessive condition affects 1 in 400 of a population in Hardy–Weinberg equilibrium. What fraction f of the population are carriers (heterozygous)?