ASU BIO 340- Genetics
Exam 1 Study Material
Questions and Complete
Solutions Graded A+
Denning [Date] [Course title]
, In Mendel's peas, yellow seeds are dominant to green. A pure-breeding yellow plant is crossed with a
pure-breeding green plant. All of the offspring are yellow. If one of these yellow offspring is crossed with
a green plant, what will be the expected proportion of plants with green seeds in the next generation? -
Correct Ans: 50%
In dogs, wire-haired is due to a dominant gene (W), smooth-haired is due to its recessive allele (w).
What is the phenotypic ratio of the F2 generation puppies resulting from a cross of homozygous wire-
haired dog witha smooth-haired dog? - Correct Ans: 3 have wire hair, 1 has smooth hair
Black guinea pig #1 was crossed with an albino guinea pig and produced 12 black offspring. When the
albino was crossed with the black guinea pig #2, 7 blacks and 5 albinos were obtained. What are the
likely genotypes for the two black guinea pigs? - Correct Ans: #1= BB, #2= Bb
A tall purple plant that is heterozygous at both loci is crossed with a homozygous recessive short, white
plant. What is the probability of obtaining a tall white plant? - Correct Ans: 1/4
A tall purple plant that is heterozygous at both loci is crossed with a homozygous recessive short, white
plant. What is the probability of obtaining either a tall white plant or a short purple plant? - Correct Ans:
1/2
In gerbils, the allele T codes for long tails, the allele t codes for short tails, the allele B codes for brown
fur and the allele b codes for white fur. If two heterozygous gerbils are crossed, what proportion of the
progeny should have short tails with brown fur? - Correct Ans: 3/16
A man and woman have dark eyes, dark hair, and freckles. The genes for these traits assort
independently. The woman is heterozygous for each of these traits, but the man is homozygous. The
dominance relationship for these alleles are:
B= dark eyes; b= blue eyes
H= dark hair; h= blond hair
F= freckles; f= no freckles
What is the probability that the child will share the same genotype as the father? - Correct Ans: 1/8
Exam 1 Study Material
Questions and Complete
Solutions Graded A+
Denning [Date] [Course title]
, In Mendel's peas, yellow seeds are dominant to green. A pure-breeding yellow plant is crossed with a
pure-breeding green plant. All of the offspring are yellow. If one of these yellow offspring is crossed with
a green plant, what will be the expected proportion of plants with green seeds in the next generation? -
Correct Ans: 50%
In dogs, wire-haired is due to a dominant gene (W), smooth-haired is due to its recessive allele (w).
What is the phenotypic ratio of the F2 generation puppies resulting from a cross of homozygous wire-
haired dog witha smooth-haired dog? - Correct Ans: 3 have wire hair, 1 has smooth hair
Black guinea pig #1 was crossed with an albino guinea pig and produced 12 black offspring. When the
albino was crossed with the black guinea pig #2, 7 blacks and 5 albinos were obtained. What are the
likely genotypes for the two black guinea pigs? - Correct Ans: #1= BB, #2= Bb
A tall purple plant that is heterozygous at both loci is crossed with a homozygous recessive short, white
plant. What is the probability of obtaining a tall white plant? - Correct Ans: 1/4
A tall purple plant that is heterozygous at both loci is crossed with a homozygous recessive short, white
plant. What is the probability of obtaining either a tall white plant or a short purple plant? - Correct Ans:
1/2
In gerbils, the allele T codes for long tails, the allele t codes for short tails, the allele B codes for brown
fur and the allele b codes for white fur. If two heterozygous gerbils are crossed, what proportion of the
progeny should have short tails with brown fur? - Correct Ans: 3/16
A man and woman have dark eyes, dark hair, and freckles. The genes for these traits assort
independently. The woman is heterozygous for each of these traits, but the man is homozygous. The
dominance relationship for these alleles are:
B= dark eyes; b= blue eyes
H= dark hair; h= blond hair
F= freckles; f= no freckles
What is the probability that the child will share the same genotype as the father? - Correct Ans: 1/8
