Chapter-15-MC - Chapter 15 Multiple Choice Practice...

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Chapter 15 Multiple Choice Practice Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. Sturtevant provided genetic evidence for the existence of four pairs of chromosomes in Drosophila in which of these ways? a. There are four major functional classes of genes in Drosophila . b. Drosophila genes cluster into four distinct groups of linked genes. c. The overall number of genes in Drosophila is a multiple of four. d. The entire Drosophila genome has approximately 400 map units. e. Drosophila genes have, on average, four different alleles. ____ 2. A woman is found to have 47 chromosomes, including 3 X chromosomes. Which of the following describes her expected phenotype? a. Masculine characteristics such as facial hair b. Enlarged genital structures c. Excessive emotional instability d. Normal female e. Sterile female ____ 3. What is the chromosomal system for determining sex in mammals? ____ 4. In cats, black fur color is caused by an X-linked allele; the other allele at this locus causes orange color. The heterozygote is tortoiseshell. What kinds of offspring would you expect from the cross of a black female and an orange male? Refer to the following information to answer the questions below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was six feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. ____ 5. How many of their daughters might be expected to be color-blind dwarfs? ____
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  • Summer '13
  • Pereira
  • Down syndrome, pts, d., sperm cells, b. monosomic

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