Chapter 5: PART 1

What is an example of complete dominance?

• Seed shape in pea plants

• Eggplant Color

• MN blood groups

• Sickle Cell Disease

What does incomplete dominance result in?

• Heterozygotes express only one type of antigen on their cells

• Phenotype of the heterozygote falls between the phenotypes of the two homozygotes

• Phenotype of the heterozygote includes phenotypes of both homozygotes

• Phenotype of heterozygote is the same as one of the homozygotes

Which of the following is an example of codominance?

• Eggplant Color

• Polydactyly

• Seed shape in pea plants

• MN blood groups

What is the penetrance of polydactyly if 38 out of 42 people with the genotype express the phenotype?

• 95%

• 85%

• 90%

• 80%

What is the probability that the first child of a heterozygous person for long ear lobes and a homozygous person for normal ear lobes will have long ear lobes, given 30% penetrance?

• 9%

• 15%

• 30%

• 50%

What type of allele causes death of the organism at an early stage of development?

• Dominant allele

• Recessive allele

• Lethal allele

• Multiple allele

How many genotypes are possible given 3 alleles at a locus?

• 12

• 9

• 6

• 3

What phenotypic ratios would be expected from a cross of Rp1/Rp2 x Rp1/rp in pearl millet?

• 4:1 Red to Purple

• 3:1 Red to Purple

• 2:1 Red to Purple

• 1:1 Red to Purple

Is it possible for Charlie Chaplin to be the father of a child with blood type B if he is type O and the mother is type A?

• Only if the child is homozygous

• Yes

• No

• Only if the child is heterozygous

What is a compound heterozygote?

• An individual with two identical alleles at a locus

• An individual with two different alleles at a locus that result in a dominant phenotype

• An individual with two different alleles at a locus that result in the recessive phenotype

• An individual with more than two alleles at a locus