1. An allele of a gene that confers musical ability is identified in a family. All 5 children received this allele from their father and are confirmed heterozygotes. 2 children play the piano relatively well, 2 play the piano and guitar well, and 1 child is a piano, flute, and clarinet virtuoso. Based only on the information given, which of the following genetic phenomena best describes this trait? (1 point) a. anticipation b. incomplete dominance c. incomplete penetrance d. overdominance e. variable expressivity 2. The human bone disease osteogenesis imperfecta (OI) is due to a dominant allele that is incompletely penetrant in heterozygotes. The Penetrance value for this genotype is currently estimated to be 0.7. A new born girl has been determine to be heterozygous for this gene. What is the probability that she will not develop OI? (1 point) a. 0.15 b. 0.30 c. 0.35 d. 0.70 e. 1 3. In a particular species of fox, coat color can be grey, red or brown. When pure-breeding foxes with grey coats are mated with pure-breeding foxes with red coats, all F 1 progeny have red coats. Mating F 1 foxes produces 105 foxes with red coats, 77 foxes with brown coats, and 12 foxes with grey coats. Based on the observed data, what is the most likely genetic basis for the inheritance of coat color in foxes? (1 point) a. multiple alleles of a gene b. one allele of the gene responsible for the trait is acting as a lethal allele c. epistasis d. incomplete dominance e. codominance 4. You have leamed that the appearance of scurs in cattle is a sex-influenced trait. A cow (i.e. a female) who is homozygous with the non-scurs allele is mated to a bull (i.e. a male cow) who is heterozygous for this gene. What is the probably that their first offspring will not have scurs? (1 point) a. 0 b. 1/4 c. 1/2 d. 1/4 e. 1 5. In cats, the dominant allele of one gene can result in no tail (or a very short tail), and this is referred to as the Manx phenotype. A recessive allele of the gene results in normal tail length. Embryos that are homozygous for the Manx allele die during early embryonic development. A cat with a normal tail is crossed to a cat with a Manx tail. What is expected offspring outcome from this cross? (1 point) a. All kittens will have a short tail b. All kittens will have a normal tail c. 1/2 the kittens will have a normal tail and 1/2 will have a short tail d. 2/3 of the kittens will have a short tail gad 1/3 will have a long tail e. 3/4 of the kittens will have a short tail ard 1/3 will have a long tail .

1. 1. An allele of a gene that confers musical ability is identified in a family. All 5 children received
this allele from their father and are confirmed heterozygotes. 2 children play the piano relatively
well, 2 play the piano and guitar well, and 1 child is a piano, flute, and clarinet virtuoso. Based
only on the information given, which of the following genetic phenomena best describes this
trait? (1 point) a. anticipation b. incomplete dominance c. incomplete penetrance d.
overdominance e. variable expressivity 2. The human bone disease osteogenesis imperfecta (OI)
is due to a dominant allele that is incompletely penetrant in heterozygotes. The Penetrance value
for this genotype is currently estimated to be 0.7. A new born girl has been determine to be
heterozygous for this gene. What is the probability that she will not develop OI? (1 point) a. 0.15
b. 0.30 c. 0.35 d. 0.70 e. 1 3. In a particular species of fox, coat color can be grey, red or brown.
When pure-breeding foxes with grey coats are mated with pure-breeding foxes with red coats, all
F 1 progeny have red coats. Mating F 1 foxes produces 105 foxes with red coats, 77 foxes with
brown coats, and 12 foxes with grey coats. Based on the observed data, what is the most likely
genetic basis for the inheritance of coat color in foxes? (1 point) a. multiple alleles of a gene b.
one allele of the gene responsible for the trait is acting as a lethal allele c. epistasis d. incomplete
dominance e. codominance 4. You have leamed that the appearance of scurs in cattle is a sex-
influenced trait. A cow (i.e. a female) who is homozygous with the non-scurs allele is mated to a
bull (i.e. a male cow) who is heterozygous for this gene. What is the probably that their first
offspring will not have scurs? (1 point) a. 0 b. 1/4 c. 1/2 d. 1/4 e. 1 5. In cats, the dominant allele
of one gene can result in no tail (or a very short tail), and this is referred to as the Manx
phenotype. A recessive allele of the gene results in normal tail length. Embryos that are
homozygous for the Manx allele die during early embryonic development. A cat with a normal
tail is crossed to a cat with a Manx tail. What is expected offspring outcome from this cross? (1
point) a. All kittens will have a short tail b. All kittens will have a normal tail c. 1/2 the kittens
will have a normal tail and 1/2 will have a short tail d. 2/3 of the kittens will have a short tail gad
1/3 will have a long tail e. 3/4 of the kittens will have a short tail ard 1/3 will have a long tail