Punnett Square Practice Table # 1 1. Right-handedness is dominant over left-handedness. A right-handed man marries a right-handed woman. They have one child who is left-handed. Use a Punnett Square to predict the possible genotypes and phenotypes of any future children. Be sure to show genotype and phenotype ratios.

2. Albinism, or being albino, is a condition where a person’s body does not produce any pigments. This is a recessive condition. Show a cross (including all ratios and work) between two heterozygous parents for this condition. What is the probability that their child would have albinism?


Punnett Square Practice Table # 2 1. In cats, long hair (L) is dominant over short hair (l). Show a cross between a homozygous long-haired cat and a short haired cat. Include genotype and phenotype ratios.

2. Having a widow’s peak is dominant. Look at the phenotypes of Beyonce and Jay Z. If they have more children and Blue Ivy gets a sibling, could they (future children) have a widow’s peak? Why or why not? Use a Punnett Square to explain your answer. 


Punnett Square Practice Table # 3 1. In pea plants, purple flowers are dominant over white flowers. Show a cross between two white-flowered plants. Include work and ratios.

2. In guinea pigs, black coat color is dominant over white coat color. What type of offspring could result from a cross between a homozygous black guinea pig and a heterozygous black guinea pig? Use a Punnett Square to obtain your results. Include genotype and phenotype ratios.


Punnett Square Practice Table # 4 1. A purple-spotted male dingo is crossed with a green-spotted female dingo. Purple spotted dingos appear most often in the dingo population. If the purple spotted dingo is homozygous dominant, what could their offspring be? (show genotype and phenotype ratios)

2. In purple people eaters, one-horn is dominant and no horns is recessive. If there was a cross of a purple people eater that is heterozygous for horns with a purple people eater that does not have horns. What would be the genotypes & phenotypes of the possible offspring?

Punnett Square Practice Table # 5

1. Let's say that in seals, the gene for the length of the whiskers has two alleles.  The dominant allele codes long whiskers & the recessive allele codes for short whiskers. Show the genotype and phenotype ratio if the male seal is homozygous dominant for long whiskers and the female seal is heterozygous.

2. If one parent seal is pure long-whiskered and the other is short-whiskered, what type(s) of whiskers could the offspring have? (show genotype and phenotype ratios)


Punnett Square Practice Table # 6 1. Mendel crossed a purebred smooth pea, which is dominant, with a purebred wrinkled pea. Give the results of the F1 generation.

2. Mendel then took the F1 generation and bred 2 of them. Give the genotype and phenotype ratios for this cross.

Punnett Square Practice Table #7 1. In humans, brown eyes (B) are dominant over blue (b). If the offspring that result from a cross are 1 Homozygous Dominant, 2 Heterozygous, and 1 Homozygous Recessive, what are the genotypes and phenotypes of the parents? Use a Punnett square to support your answer.

2. Mrs. Bottalico wants to figure out what color eyes her daughter will have. She has brown eyes but has a family history of blue and green, so it has been determined that she is heterozygous. Her husband has blue eyes. Is there a chance their little girl will have blue eyes?

Punnett Square Practice Table #8 1. Red eyes are dominant in mice. Brown eyes are recessive. A pair of mice produced 150 red eyed babies and 51 brown eyed babies. What are the genotypes of the parents? How do you know? (Show a Punnett Square to prove it)

2. Black fur in guinea pigs is dominant. White fur in guinea pigs is recessive. Cross a heterozygous black guinea pig with a homozygous white guinea pig. What is the probability that the offspring will have black fur?