Single Gene Inheritance - Introduction to Genetic Analysis

In pet rabbits,brown coat color is recessive to black coat color.A black female rabbit gives birth to four black-coated and three brown-coated baby rabbits.What can be deduced about the genotype of the baby rabbits' father?

A)He could be heterozygous black/brown or homozygous brown.
B)He could be heterozygous black/brown or homozygous black.
C)He must be heterozygous black/brown.
D)He must be homozygous black.
E)He must be homozygous brown.

Answer

Question 2

(Multiple Choice)

Free

A rare,curly winged mutant of Drosophila was found in nature.A mating of this fly with a true-breeding,normal laboratory stock produced progeny in the ratio 1 curly winged to 1 normal (both sexes had the same ratio).All curly winged progeny of this cross,mated with normal progeny of the same cross,again yielded 1 curly winged to 1 normal fly.When mated with one another,the curly winged progeny of the first cross yielded a progeny of 623 curly : 323 normal.This ratio strongly suggests which of the following?

A)Curly and normal are in the 3:1 ratio expected from intercrossing monohybrid genotypes for a recessive mutant allele (curly).
B)Curly and normal are in the 3:1 ratio expected from intercrossing monohybrid genotypes for a dominant mutant allele (curly).
C)The curly winged parent of the curly

\times

curly cross is homozygous.
D)Flies homozygous for the curly allele are lethal and never survive.
E)The gene for curly is sex-linked.

Answer

Question 3

(Multiple Choice)

Free

A plant is heterozygous at three loci.How many different gamete genotypes can it theoretically produce with respect to these three loci?

A)2
B)3
C)4
D)8
E)16

Answer