Question 1

In Drosophila, the genes for body coloration and eye size are on different chromosomes.Normal-colored bodies are dominant to ebony-colored (very dark) bodies, and normal-sized eyes are dominant to eyelessness.Line A is true breeding for normal bodies and normal eyes, whereas line B is true breeding for ebony bodies and eyelessness.From an F2 cross between lines A and B, 800 flies are scored.How many F2 flies are expected to have normal body color and to be eyeless?

Accepted Answer

A)  3 
B)  50 
C)  150 
D)  450 
E)  600

Question 2

If the same allele has two or more phenotypic effects, it is said to be

Accepted Answer

A)  codominant. 
B)  a marker. 
C)  linked. 
D)  hemizygous. 
E)  pleiotropic.

Question 3

Draw a pedigree for at least three generations and 12 individuals that shows the transmission of a recessive autosomal trait.Shade affected individuals, leaving unaffected carriers and those without the mutant allele unshaded.

Accepted Answer

The answer of Draw a pedigree for at least three...

Question 4

Which method was not used by Mendel in his study of the genetics of the garden pea?

Accepted Answer

A)  Maintenance of true-breeding lines 
B)  Cross pollination 
C)  Production of hybrid plants 
D)  Quantitative analysis of results 
E)  Tracking of chromosomal movements

Question 5

Draw a pedigree for three generations in which the grandfather has red-green color blindness and his daughter is a carrier.

Accepted Answer

The answer of Draw a pedigree for three generations in...

Question 6

Different forms of a gene are referred to as

Accepted Answer

A)  traits. 
B)  phenotypes. 
C)  genotypes. 
D)  alleles. 
E)  genomes.

Question 7

Consider crosses between individuals of different heritable phenotypes.Under which condition will the phenotype of the offspring most likely be influenced by which parent has which phenotype?

Accepted Answer

A)  In cases involving sex chromosomes 
B)  In cases involving epistasis 
C)  In cases involving pleiotropy 
D)  In cases involving codominance 
E)  In cases involving closely linked genes

Question 8

The totality of all the genetic material of an organism is known as the organism's _______.

Accepted Answer

The answer of The totality of all the genetic material...

Question 9

Suppose that two different groups of schmoos (an imaginary animal) live in geographically separated locations and rarely interbreed.On one occasion, a big-footed white-haired schmoo does mate with a small-footed brown-haired schmoo.Six offspring result: two big-footed schmoos with light brown hair and four small-footed schmoos with light brown hair.Which statement about the inheritance of hair color in schmoos is most likely correct?

Accepted Answer

A)  There is incomplete dominance. 
B)  Brown is dominant to white. 
C)  White is dominant to brown. 
D)  White and brown are codominant. 
E)  This cannot be answered without more information.

Question 10

A centiMorgan is a unit of

Accepted Answer

A)  mutation frequency. 
B)  epistasis. 
C)  dominance. 
D)  recombination frequency. 
E)  pleiotropy.

Question 11

Genes located on mitochondrial DNA are usually inherited

Accepted Answer

A)  randomly. 
B)  from the mother. 
C)  from the father. 
D)  evenly from both the mother and the father. 
E)  by independent assortment.

Question 12

A dog has floppy ears.The nature of the ear is a _______, and the floppy nature of this particular dog's ears is the _______.

Accepted Answer

A)  character; genotype 
B)  character; trait 
C)  genotype; character 
D)  genotype; trait 
E)  trait; character

Question 13

Suppose members of a true-breeding strain of salamanders with yellow stripes are crossed with a true-breeding strain with red stripes.Red and yellow are two alleles of the same gene.The resulting offspring have both yellow stripes and red stripes.Which dominance pattern is most likely?

Accepted Answer

A)  Red stripes are dominant to yellow stripes. 
B)  Yellow stripes are dominant to red stripes. 
C)  Red and yellow stripes exhibit incomplete dominance. 
D)  Red and yellow stripes exhibit overdominance. 
E)  Red and yellow stripes exhibit codominance.

Question 14

The cross AaBb × AaBb is an example of a _______ cross, and the results of such crosses led Mendel to propose what we now call the law of _______.

Accepted Answer

A)  self; segregation of genes 
B)  dihybrid; segregation of genes 
C)  dihybrid; independent assortment 
D)  test; segregation of genes 
E)  test; independent assortment

Question 15

If white-eyed flies are crossed with other white-eyed flies from the same strain, the offspring will all have white eyes.This trait can thus be said to be

Accepted Answer

A)  dominant. 
B)  recessive. 
C)  filial. 
D)  true breeding. 
E)  heterozygous.

Question 16

Epistasis refers to

Accepted Answer

A)  a group of genes that are close together. 
B)  intermediate dominance. 
C)  the expression of two alleles of the same gene in an individual. 
D)  the linear order of genes on a chromosome. 
E)  the expression of one gene affecting the expression of another.

Question 17

What is the map distance between two genes with a recombination frequency of 0.08?

Accepted Answer

A)  80 cM 
B)  8 cM 
C)  0.8 cM 
D)  0.08 cM 
E)  More information is required to answer this question.

Question 18

In the ABO blood type system,

Accepted Answer

A)  A, B, and O are codominant. 
B)  A, B, and O are incompletely dominant. 
C)  A is dominant to B, and B is dominant to O. 
D)  O is incompletely dominant to A and B. 
E)  A and B are codominant.

Question 19

Why do organelle genes tend to have multiple alleles?

Accepted Answer

A)  They recombine. 
B)  They are pleiotropic. 
C)  They mutate frequently. 
D)  They are transmitted only by the mother. 
E)  They have few genes.

Question 20

Recombination takes place during _______ of meiosis.

Accepted Answer

A)  prophase I 
B)  prophase II 
C)  metaphase 
D)  anaphase 
E)  Recombination does not take place during meiosis.

Exam 12: Inheritance, Genes, and Chromosomes