Genetics Practice Problems Essay

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Simple Genetics Practice Problems
1. For each genotype, indicate whether it is heterozygous (HE) or homozygous (HO)
AA ____
Bb ____
Cc ____
Dd ____

Ee ____ ff ____
GG ____
HH ____

Ii ____
Jj ____ kk ____
Ll ____

Mm ____ nn ____
OO ____
Pp ____

2. For each of the genotypes below, determine the phenotype.
Purple flowers are dominant to white flowers
PP ___________________________
Pp ___________________________ pp ___________________________

Brown eyes are dominant to blue eyes
BB ___________________________
Bb ___________________________ bb ___________________________

Round seeds are dominant to wrinkled
RR ___________________________
Rr ___________________________ rr ___________________________

Bobtails are recessive (long tails dominant)
TT ___________________________
Tt ___________________________ tt ___________________________

3. For each phenotype, list the genotypes. (Remember to use the letter of the dominant trait)
Straight hair is dominant to curly.
____________ straight
____________ straight
____________ curly

Pointed heads are dominant to round heads.
____________ pointed
____________ pointed
____________ round

4. Set up the square for each of the crosses listed below. The trait being studied is round seeds (dominant) and wrinkled seeds (recessive)

Rr x rr

What percentage of the offspring will be round? ___________

Rr x R r

What percentage of the offspring will be round? ___________

RR x Rr

What percentage of the offspring will be round? ___________
Practice with Crosses. Show all work!
5. A TT (tall) plant is crossed with a tt (short plant).
What percentage of the offspring will be tall? ___________
6. A Tt plant is crossed with a Tt plant. What percentage of the offspring will be short? ______
7. A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR). What percentage of the offspring will be homozygous (RR)? ____________
8. A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents?
__________ x __________
What percentage of the offspring will also be homozygous? ______________
9. In pea plants purple flowers are dominant to white flowers.
If two white flowered plants are cross, what percentage of their

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