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BIL 250 Study Guide - Quiz Guide: Wild Type, Dna Replication, Meiosis

Course Code
BIL 250
Y. Wang
Study Guide

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Workshop #1 questions with answer key in bold
1. A mutation occurs in a germ cell of a pure-breeding, wild-type male mouse prior to DNA
replication. The mutation is not corrected, and the cell undergoes DNA replication and a normal
meiosis producing four gametes. How many of these gametes will carry the mutation?
A) 1
B) 2
C) 3
D) 4
E) It is impossible to predict.
2. “Dumpy” is a commonly used mutant phenotype in the nematode worm C. elegans. Two
“Dumpy” individuals are crossed to each other, and this cross produces 210 “Dumpy” and 68
wild-type individuals. If one of the “Dumpy” individuals used in this cross was mated with a
wild type, what “Dumpy”: wild-type ratio would we observe in the offspring?
A) 0:1
B) 1:0
C) 1:1
D) 1:3
E) 3:1
3. A female rabbit of phenotype c is crossed to a male rabbit with cch. The F1 is comprised of
five rabbits with a c phenotype, two with cch phenotype, and three with c phenotype. Of the
phenotypically c rabbits, two are females and are backcrossed to their father. This cross produces
only rabbits with cch phenotype. These results suggest that:
A) c could be dominant or recessive to c.
B) c is dominant to c, but recessive to cch.
C) c is dominant to cch, but recessive to c.
D) c is dominant to both c and cch.
E) c is recessive to both c′ and cch.
4. A plant with small red flowers is crossed to a plant with large white flowers. Both plants are
true breeding in flower size and color. The resulting F1 is comprised of 75 plants with small red
flowers and 72 plants with small white flowers.
If flower color and flower size are controlled by a single gene each, what can be concluded from
these results?
A) Flower color is controlled by a sex-linked gene.
B) Red color and small size are dominant to white color and large size, respectively.
C) Small size is dominant to large size, but we can’t determine which color is dominant.
D) We can’t determine which color and which size are dominant.
E) White color and small size are dominant to red color and large size.
5. A female Drosophila with the mutant phenotype a is crossed to a male who has the mutant
phenotype b. In the resulting F1 generation all females are wild-type and all males have the a
mutant phenotype. Based on these results, we can conclude that the mode of inheritance of the
phenotypes of interest is:
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