1. The gene for tall plants (T) is dominant over the gene for dwarf or short plants (t) in peas. A homozygous tall plant is crossed with a heterozygous.

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Presentation transcript:

1. The gene for tall plants (T) is dominant over the gene for dwarf or short plants (t) in peas. A homozygous tall plant is crossed with a heterozygous plant. What are the chances of them having tall offspring? Of them having short offspring? Of heterozygous offspring?

2. Cross two heterozygous plants using the information in problem 1 2. Cross two heterozygous plants using the information in problem 1. What are the genotypes of the offspring? What are the phenotypes?

3. Brown eyes are dominant over blue eyes 3. Brown eyes are dominant over blue eyes. A man with heterozygous genes for brown eyes marries a lady with blue eyes. What are the genotype and phenotype percentages of their offspring?

4. A lady with brown eyes marries a man with blue eyes 4. A lady with brown eyes marries a man with blue eyes. They have two children: a boy with brown eyes and a girl with blue eyes. What are the genotypes of the father, mother, son, and daughter. Explain your answer.

5. A man with blue eyes marries a woman that is homozygous recessive for eye color. What are the chances of them having a blue eyed kid? Why? What about a brown eyed kid?

End of side 1

6. Green eyes are dominant over blue eyes 6. Green eyes are dominant over blue eyes. Two people with green eyes have a baby with blue eyes. Is this genetically possible or is the baby adopted?

7. Two people who are homozygous recessive for eye color have a baby with brown eyes. Is this genetically possible or is the baby adopted?

8. Rough fur is dominant over soft fur in cats 8. Rough fur is dominant over soft fur in cats. A heterozygous cat mates with a homozygous recessive cat. What are the genotypes of the kittens? What are the phenotypes?

9. A homozygous recessive cat mates with a homozygous dominant cat 9. A homozygous recessive cat mates with a homozygous dominant cat. What kind of fur will the offspring have?

10. One of the offspring in problem #9 mates with a heterozygous cat from down the street. What is the possibility of the new kittens being heterozygous? Of being homozygous dominant? Homozygous recessive?

11. Two cats have 24 kittens. Seventeen have rough fur and 7 have soft fur. What are the genotypes of the parents? How do you know?