Punnett Square Problems
B=blonde hair b=brown hair E=blue eyes
T=tall t=short e=brown eyes
Use the key above and answer the following questions.
1. In the
genotype Bb, what is the dominant
letter and corresponding trait and what is the recessive letter and
corresponding trait? _____________________________________
homozygous brown eyed person.
3B. In the corresponding F2 generation, what will the phenotype ratio be? _________________________
What are those specific phenotypes? (i.e. tall, short etc)_________________________
4. A person
has blonde hair and is heterozygous dominant for this trait.
Give me the genotype for this person. ________________________
5. What is the
difference between a genotype and a phenotype?
7. A person is very short. They are homozygous recessive for this trait. Give me the genotype for this person.
8. Joe and Liz
are expecting their first child. Liz
has brown eyes and Joe has green. Joe
would like a child with green
eyes (G) and Liz would like a child with brown eyes (g). Given that Liz is homozygous for her brown eyes, and Joe is
heterozygous for his green, what are the chances their children will get the eyes Liz and Joe want?
9. Draw a Punnett square (16 boxes) for dihybrid crosses and cross straight blonde hair (SB), curly blonde hair (sB),
straight red hair (Sb) and curly red hair (sb). What is the phenotype ratio?