Ch. 6 Homework

Reginald Punnett is known as the Father of Genetics.

• True

• False

If your grandparents are the parent generation, what generation are you?

• parent

• F1

• F2

• F3

An organism with the genotype Dd would exhibit the _____________ phenotype.

• dominant

• recessive

The condition when two alleles for a trait are both expressed, resulting in a blending of the trait, is called

• multiple alleles

• incomplete dominance

• codominance

• hybrid dominance

In a type of chicken, the allele for white feathers and the allele for black feathers are both dominant. Hybrid offspring have both black and white feathers. This is an example of _____________.

• codominance

• polygenic inheritance

• a recessive trait

• incomplete dominance

Which human blood type is caused by a purebred recessive genotype?

• Type A

• Type B

• Type AB

• Type O

In fruit flies, the allele for white eyes is dominant over the allele for red eyes. On a Punnett square, cross a hybrid white-eyed fly with a red-eyed fly. What would you expect the phenotypes of the offspring to be?

• 75% white-eyed and 25% red-eyed

• 50% white-eyed and 50% red-eyed

• 75% red-eyed and 25% white-eyed

• 50% white-eyed and 50% pink-eyed

Which of these genotypes would show the recessive phenotype?

• TT

• Tt

• tt

• Both A and B

• Both B and C

Which of these blood-type crosses could produce a child with type O blood?  Make a Punnett square to find out.

•  $\ I^bI^bx\ I^aI^{a\ }$  

•  $I^ai\ x\ I^bi$  

•  $ii\ x\ I^aI^b$  

•  $I^bi\ x\ I^aI^b$  

If you cross an Rr genotype with an Rr genotype, what do you expect will be the most common genotype in the F1 generation? Make a Punnett square to find out.

• RR

• Rr

• rr