Genetics-Recap Worksheet1. Write the correct term for the following definitions:
Allele, Phenotype, Genotype, Dominant, Recessive, Homozygous, Heterozygous
Genotypes made of the same alleles ____________
Different forms of genes ______________
Gene that is always expressed _______________
Gene that is only expressed in homozygous recessive states ___________
Genes made of 2 different alleles _______________
A person’s physical characteristics _____________
The gene’s a person has _____________
2. In guinea pigs short hair (S) is dominant over long hair (s)
What is the genotype of a heterozygous guinea pig?
What is the phenotype of a heterozygous guinea pig?
If a guinea pig has long hair what are its possible genotypes?
If a guinea pig has short hair what are its possible genotypes?
An Ss guinea pig is (phenotype and genotype) _______________
An SS guinea pig is _______________
An ss guinea pig is ________________
3. In puppies, long floppy ears are dominant (L), over short, spiked ears (l). If a father with short,
spiked ears mates with a mother who is heterozygous what are the possible genotypes of the offspring?
What % of the offspring will have long floppy ears?
4. In tomatoes, red fruit (R) is dominant over yellow fruit (r).
If a homozygous red fruit plant is crossed with a yellow fruit plant, what are the expected genotypic and
phenotypic percentages of the F1 generation?
If two plants from the F1 generation were crossed what would be the resultant genotypic and
phenotypic percentages for this cross?
5. In humans, normal pigmentation is due to a dominant allele (C) and albinism is due to a recessive
allele (c). A normal man marries an Albino woman. Their first child is an Albino.
What are the genotypes of these 3 individuals?
Man:
Woman:
Child:
If the couple have more children what percentage would be like their dad?
5. If two black mice are crossed, ten black and three white mice result.
Which allele is dominant?
Which allele is recessive?
What are the genotypes of the parents?
6. A woman who is a carrier for Cystic Fibrosis marries a man who has Cystic Fibrosis, a recessive
disease. (Use C as the dominant allele and c for the recessive allele)
What are their genotypes?
Man
Woman
What is the probability that their children will have the disease?
What is the probability that their children will not have the disease? Show a Punnett square.
7. You are working as a genetics specialist in a hospital. A couple comes to you saying they want to have
a baby, but they want the baby to have freckles and neither of the potential parents has this phenotype.
You take out your trusty, always useful, grade 10 Biology textbook and find out that freckles are
inherited as a dominant trait.
What news can you now give the anxious couple? Support this wise knowledge you have imparted by
setting up a Punnett square to prove your point.
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