QUESTION 1 The figure shown below indicates two Labrador retrievers that are both homozygous recessive for fur color. One dog is brown and the other is yellow due to a. pleiotropy. c incomplete dominance. d. epistasis. QUESTION 3 Which of the following did Gregor Mendel notice in garden peas? a. Some plants always produced offspring with flowers that were the same color as the parent plants’ flowers. b. Garden peas always produce a variety of phenotypes in their offspring, which result from frequent mutations. c. Any individual pea plant carries at least three different alleles for flower color. QUESTION 4 A chestnut-colored (red-colored) horse is mated with a cremello (cream-colored) horse. Over a 10-year period, all of their offspring are palominos (gold-colored). This pattern of inheritance is best explained by a. environmental effects on genes. c. multiple gene effects. d. incomplete dominance. QUESTION 6 Consider a gene with two alleles that show complete dominance. When two heterozygotes for this gene breed, they have a 25 percent chance of producing a homozygous recessive offspring. The next time these two individuals breed, what are the chances that they will once again have a homozygous recessive progeny? b. 75 percent c. 0 percent d. 25 percent QUESTION 7 Which of the following statements is NOT true? a. Environmental factors can alter the effects of genes. b. A genotype is always expressed in the phenotype. c. Traits that are determined by the effect of more than one gene are known as polygenic. QUESTION 10 A hammer is needed to pound nails into a board. Even if one has the nails, they cannot be used without first getting ahold of a hammer. This is similar to the genetic relationship known as a. codominance. c. independent assortment. d. epistasis.
QUESTION 1
The figure shown below indicates two Labrador retrievers that are both homozygous recessive for fur color. One dog is brown and the other is yellow due to
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a. |
pleiotropy. |
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c |
incomplete dominance. |
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d. |
epistasis. |
QUESTION 3
Which of the following did Gregor Mendel notice in garden peas?
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a. |
Some plants always produced offspring with flowers that were the same color as the parent plants’ flowers. |
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b. |
Garden peas always produce a variety of |
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c. |
Any individual pea plant carries at least three different alleles for flower color. |
QUESTION 4
A chestnut-colored (red-colored) horse is mated with a cremello (cream-colored) horse. Over a 10-year period, all of their offspring are palominos (gold-colored). This pattern of inheritance is best explained by
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a. |
environmental effects on genes. |
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c. |
multiple gene effects. |
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d. |
incomplete dominance. |
QUESTION 6
Consider a gene with two alleles that show complete dominance. When two heterozygotes for this gene breed, they have a 25 percent chance of producing a homozygous recessive offspring. The next time these two individuals breed, what are the chances that they will once again have a homozygous recessive progeny?
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b. |
75 percent |
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c. |
0 percent |
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d. |
25 percent |
QUESTION 7
Which of the following statements is NOT true?
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a. |
Environmental factors can alter the effects of genes. |
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b. |
A genotype is always expressed in the phenotype. |
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c. |
Traits that are determined by the effect of more than one gene are known as polygenic. |
QUESTION 10
A hammer is needed to pound nails into a board. Even if one has the nails, they cannot be used without first getting ahold of a hammer. This is similar to the genetic relationship known as
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a. |
codominance. |
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c. |
independent assortment. |
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d. |
epistasis. |
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