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Genetics Mini Quiz
Take a out a sheet of paper
Write your name, date and period in top right-hand corner
What is the difference between homozygous and heterozygous
genotypes? Show an example of each.
(Draw, write, or explain)Homozygous = TT or tt, 2 alleles that have the same
dominant/recessive genotype.Heterozygous = Tt, 2 alleles that have 1 recessive & 1 dominant
genotype, hybrid.
What is the difference between phenotype and genotype? Explain
and give example(Draw, write, or explain)
Phenotype = visible characteristics of an organism, (fur, eye color, features, etc)
Genotype = Non-visible, genetic code, TT, Tt, tt, tells what phenotypes will be expressed
Punnett Square
1. In seals, the gene for long whiskers is dominant (W). a) What percent of the offspring will have short whiskers if a homozygous long-whiskered seal is crossed with a heterozygous long-whiskered seal?
0% of the offspring will have short whiskers
WW WW
Ww Ww