Genetics Worksheet I Name: ______________________
Scientists have been investigating the genetic makeup of organisms in communities all over
the planet. Use the information provided and your knowledge of genetics to answer each
question.
1. For each genotype below, indicate whether it is heterozygous (He) or homozygous (Ho).
TT _____ Bb _____ DD _____ Ff _____ tt _____ dd _____
Dd _____ ff _____ Tt _____ bb _____ BB _____ FF _____
Which of the genotypes in # 1 would be considered purebred? __________________
Which of the genotypes in # 1 would be considered hybrids? ____________________
2. Determine the phenotype for each genotype using the information provided.
Freckles are dominant to no freckles
FF __________________ Ff __________________ ff __________________
Extra digits (fingers or toes) is dominant to five digits
EE __________________ Ee __________________ ee __________________
3. For each phenotype, give the genotype(s) that are possible.
Dwarfism (D) is dominant to regular height (d)
Dwarfism: __________________ Regular Height: __________________
Webbed fingers (W) is dominant to normal fingers (w).
Webbed Fingers: __________________ Normal Fingers: __________________
4. Bob & Susie met at a dance. Bob is heterozygous for his freckles, but Susie has no
freckles. Create a Punnett square to show the possibilities that would result if Bob &
Susie had children. Use the letter F/f.
A. List the possible genotypes and phenotypes for their
children.
B. What are the chances of a child with freckles? _____out of _____or _____ %
C. What are the chances of a child with no freckles? _____out of _____or _____ %
