Download Dihybrid Crosses – Practice Name: Period: _____ In rabbits, grey

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Dihybrid Crosses – Practice
Name: __________________________________________
Period: _____
In rabbits, grey hair is dominant to white hair, and black eyes are dominant to red eyes. Write the phenotype for each genotype
GG =
BB =
Gg =
Bb =
gg =
bb =
1. What are the phenotypes of rabbits that have the following genotypes:
Ggbb ____________________
ggBB ________________________
ggbb ____________________
GgBb _________________________
2. A male rabbit homozygous dominant for hair and homozygous recessive for eyes is crossed with a female rabbit
heterozygous for both traits. Determine the phenotypes and proportions in the offspring.
How many out of 16 are:
Grey, red eyed ____
Grey, black eyed ____
White, red eyed ____
White, black eyed ____
3. A male rabbit has the genotype GgBb. Determine the gametes produced by this rabbit (the sperm would have these
combinations of alleles) and describe how these sperm cells demonstrate the laws of segregation and independent
4. A female rabbit has the genotype ggBb. Determine the gametes (eggs) produced by this rabbit.
5. Use the gametes from #3 and #4 to set up a Punnett square. Put the male's gametes on the top and the female's gametes
down the side. Then fill out the square and determine what kind of offspring would be produced from this cross and in
what proportion.
Dihybrid Crosses – Practice
Name: __________________________________________
Period: _____
6. An aquatic arthropod called Cyclops has antennae that are either smooth or barbed. The allele for barbs is
dominant. In the same organism, long tails are dominant to short tails. Show all the possible genotypes
(and phenotypes) of this organism. Use the rabbit key to help you if you’re lost.
7. A Cyclops that has a short tail and smooth antennae is crossed with one that is heterozygous for both traits. Show the
genotypes of the parents.
______________ x _______________
8. Set up a Punnett square for the cross in #7.
9. A Cyclops that is true breeding for the barbed gene (BB) and long-tailed (TT) is crossed with one that is not barbed and
long-tailed (Tt)? How many of the offspring will be barbed and long-tailed? Use a Punnett square to find the answer!
10. If two Cyclops that are heterozygous for both traits are crossed, what are the resulting phenotypes and in what proportion?