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? What percentage of the offspring will also be homozygous?
q,
9. In guinea pigs, the allele for short hair is dominant. What genotype would a heterozygous short haired guinea pig have? What genotype would a pure breeding short haired guinea pig have? What genotype would a long haired guinea pig have?
q,
10. Two short haired guinea pigs are mated several times. Out of 100 offspring, 25 of them have long hair. What are the probable genotypes of the parents? Show the cross to prove it!