Download Name

Name ____________________________________
Assignment: Genetics Review (#49, 10 pt) due 1/4
Period: _____
Complete the following crosses: draw a Punnett square, list the ratio and probability (%) of the offspring. Be sure to
remember that the capital letter is dominant.
Example)
A green pea plant (GG) is being crossed with a green pea plant (Gg).
G
G
G
GG
GG
g
Gg
Gg
Genotype = 2/4 (50%) GG
2/4 (50%) Gg
Phenotype = 4/4 (100%) Green
1. A green pea plant (GG) is crossed with a yellow pea plant (gg).
Genotype =
Phenotype =
2. A red flower (Rr) is crossed with a white flower (rr).
Genotype =
Phenotype =
3. A tall plant (TT) is crossed with a short plant (tt).
Genotype =
Phenotype =
Complete the following problems. List the parent genotypes, draw and fill in a Punnett square, and then list the
offspring genotypes and phenotypes. Remember: The dominant allele is the capital letter (if Red is the dominant
color than the allele for the trait is R).
4. A heterozygous brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color).
Genotype =
Phenotype =
5. Two homozygous white (brown fur is recessive) rabbits are crossed.
Genotype =
Phenotype =
6. Figure out the missing alleles in the punnett squares:
G
___
___
G__
Gg
G
G __
Gg
b
b
___
B __
B__
___
___ b
B__
7. If you crossed a purebred black cat with a purebred white cat and all the offspring were black, what is the
dominant allele? Explain with a punnett square.
Genotype =
Phenotype =
8. A purebred has offspring that are all the same. If you bred a dominant allele purebred with a recessive allele
purebred, would all the offspring look the same? Explain with a punnett square (use B,b for alleles, blue and yellow
for traits).
Genotype =
Phenotype =
Answer: