Download genetics hw #2 - word

Genetics Homework #2
Name _____________________
1. For each of the genotypes below, determine what the phenotype would be.
• Purple flowers are dominant to white flowers.
PP ______________ Pp _____________
pp ______________
• Hairy knuckles are dominant to non-hairy knuckles in humans.
HH _____________
Hh _____________
hh ______________
• Bobtails in cats are recessive. Normal tails are dominant.
TT ______________
Tt _____________
tt _______________
• Round seeds are dominant to wrinkled seeds in pea plants.
RR _____________
Rr _____________
rr _______________
• No-cleft chin is dominant. Cleft chin is recessive.
CC _____________
Cc _____________
cc _______________
2. For each of the following write whether it is homozygous dominant, heterozygous or
homozygous recessive.
AA _____________________ Ff ____________________
gg ______________________
Pp ______________________
GG ___________________
Ii _____________________
tt _______________________
Use the following information for questions 3-5: In dogs, the gene for fur color has two alleles (variations).
The dominant allele (F) codes for grey fur, and the recessive allele (f) codes for black fur.
3. The female dog is heterozygous. The male dog is homozygous recessive. Use a Punnett Square to Figure
out the phenotype numbers and genotype numbers of their possible puppies.
Genotypes:
Phenotypes:
FF:
Ff:
ff:
Black fur:
Grey fur:
4. The female dog has black fur. The male dog has black fur. Figure out the phenotype
numbers and genotype numbers of their possible puppies by using a Punnett Square.
Genotypes:
Phenotypes:
FF:
Ff:
ff:
Black fur:
Grey fur:
5. The female dog is heterozygous. The male dog is heterozygous. Figure out the phenotypes
numbers and genotypes numbers of their possible puppies by using a Punnett Square.
Genotypes:
Phenotypes:
FF:
Black fur:
Ff:
ff:
Grey fur:
6. Trait: Pod shape
• smooth is dominant (S)
• bumpy is recessive (s)
• parents: Ss father and ss mother
• What shape(s) are the parents?
• What shape(s) are the children?
7. Trait: plant height
• tall is dominant (T)
• short is recessive (t)
• What is the genotype of the missing parent?
• What are the phenotypes of the parents?
• What are the phenotypes of the offspring?
8. What will the offspring be like from the cross of a true-breeding white hamster and a brown hamster if the
brown hamster’s mother was white? Brown is dominant.
Challenge: Dihybrid Cross - two traits
• Suppose that black hair (B) is dominant over blonde hair (b), and brown eyes (E) are dominant over blue
eyes (e).
• The father is heterozygous for both traits, and the mother has blonde hair and blue eyes.
• Genotype of father: BbEe
• Genotype of mother - bbee
• Set up a dihybrid cross (two traits) using the Punnett square below
• What percentage of the offspring will be totally heterozygous (for both traits)?
• What percentage of the offspring will have blonde hair and blue eyes?