Bio Ch 14
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- 1.Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division?
- A.
Prophase I of meiosis
- B.
Prophase II of meiosis
- C.
Metaphase I of meiosis
- D.
Anaphase I of meiosis
- E.
Anaphase of mitosis
- 2.Mendel's second law of independent assortment has its basis in which of the following events of meiosis I?
- A.
Synapsis of homologous chromosomes
- B.
Crossing over
- C.
Alignment of tetrads at the equator
- D.
Separation of homologs at anaphase
- E.
Separation of cells at telophase
- 3.Which describes the ability of a single gene to have multiple phenotypic effects?
- A.
Incomplete dominance
- B.
Multiple alleles
- C.
Pleiotropy
- D.
Epistasis
- 4.Two characters that appear in 9:3:3:1 ratio in the F2 generation should have which of the following properties?
- A.
Each of the traits is controlled by single genes.
- B.
The genes controlling the characters obey the law of independent assortment.
- C.
Each of the genes controlling the characters has two alleles.
- D.
Four genes are involved.
- E.
Sixteen different phenotypes are possible.
- 5.When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessivephenotype?
- A.
0%
- B.
25%
- C.
50%
- D.
75%
- E.
100%
- 6.Labrador retrievers are black, brown, or yellow. In a cross of a black female with a brown male, results can be either all black puppies, 1/2 black to 1/2 brown puppies, or 3/4 black to 1/4 yellow puppies. These results indicate which of the following?
- A.
Brown is dominant to black.
- B.
Black is dominant to brown and yellow.
- C.
Yellow is dominant to black.
- D.
There is incomplete dominance.
- E.
Epistasis is involved.
- 7.A 1:2:1 phenotypic ratio in the F2 generation of a monohybrid cross is a sign of:
- A.
Complete dominance.
- B.
Multiple alleles.
- C.
Incomplete dominance
- D.
Polygenic inheritance
- E.
Pleitropy
- 8.The flower color trait in radishes is an example of which of the following?
- A.
A multiple allelic system
- B.
Sex linkage
- C.
Codominance
- D.
Incomplete dominance
- E.
Epistasis
- 9.The relationship between genes S and N is an example of
- A.
Incomplete dominance
- B.
Epistasis
- C.
Complete dominance
- D.
Pleitropy
- E.
Codominance
- 10.Cystic fibrosis affects the lungs, pancreas, the digestive system, and other organs, resulting in symptoms ranging from breathing difficulties to recurrent infections. Which of the following terms best describes this?
- A.
Incomplete dominance
- B.
Multiple alleles
- C.
Pleitropy
- D.
Epistasis
- 11.Huntington's disease is a dominant condition with late age of onset in humans. If one parent has the disease, what is the probability that his or her child will have the disease?
- A.
1
- B.
3/4
- C.
1/2
- D.
1/4
- E.
0
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