In epistasis
a. the phenotype does not change from generation to generation.
b. one gene affects the expression of another.
c. a portion of a chromosome is deleted.
d. a portion of a chromosome is inverted.
e. the behavior of two genes is entirely independent.
Answer: b. one gene affects the expression of another.
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It is possible to make seedless tomatoes by removing the anthers of the flower and putting a hormone (auxin) on the stigma of the tomato flower
Weekly applications are required. Over the course of development, the stigma and style fall off, and the ovary develops into a normal-looking tomato with no seeds. Normally, seed and fruit formation are coordinated using hormone signaling. What does the application of auxin indicate? A) The stigma of a tomato flower produces auxin that is necessary for pollination. B) Auxin stimulates the development of the pericarp into the ovary wall. C) Applied auxin must substitute for an auxin source in a developing seed. D) Auxin is naturally produced by pollen and transferred, along with genetic material, to the flower.
In the citric acid cycle, succinate is oxidized to form
A. fumarate. B. succinate. C. citrate. D. malate. E. oxaloacetate.
In humans, hair texture is an incompletely dominant trait. Curly is the dominant genotype, wavy is heterozygous, and straight hair is recessive. What is the probable phenotypic ratio for a cross between a man with wavy hair and a woman with curly hair?
a. All wavy hair b. 3/4 wavy hair; 1/4 straight hair c. 1/2 wavy hair; 1/2 curly hair d. All curly hair e. 1/4 curly hair; 1/2 wavy hair; 1/4 straight hair
If C is dominant to c, what fraction of offspring will be homozygous recessive when two heterozygous parents are
crossed? a. 0/4 b. 1/4 c. 2/4 d. 3/4 e. 4/4