Question 1

In pedigree charts,autosomal dominant disorders typically

Accepted Answer

A) appear only in males. 
B) appear only in females. 
C) appear in every generation. 
D) seem to disappear in one generation,only to reappear in the next generation. 
E) occur every third generation. 
A) appear only in males. 
B) appear only in females. 
C) appear in every generation. 
D) seem to disappear in one generation,only to reappear in the next generation. 
E) occur every third generation. C

Question 2

Alternate forms of the same gene are called

Accepted Answer

A) chromatids. 
B) centromeres. 
C) chromosomes. 
D) alleles. 
E) traits. 
A) chromatids. 
B) centromeres. 
C) chromosomes. 
D) alleles. 
E) traits. D

Question 3

In Huntington disease,a child will typically get the disease only if one parent also has it.It is as common in boys as in girls.This disease is

Accepted Answer

A) autosomal recessive. 
B) X-linked recessive. 
C) X-linked dominant. 
D) autosomal dominant. 
E) pleiotropic. 
A) autosomal recessive. 
B) X-linked recessive. 
C) X-linked dominant. 
D) autosomal dominant. 
E) pleiotropic. D

Question 4

In the ABO blood type system the alleles IA,IB and i produce

Accepted Answer

A) three phenotypes. 
B) two phenotypes. 
C) one phenotype. 
D) four phenotypes. 
E) type A and type B blood types only. 
A) three phenotypes. 
B) two phenotypes. 
C) one phenotype. 
D) four phenotypes. 
E) type A and type B blood types only.

Question 5

A single chromosome has

Accepted Answer

A) multiple genes each with a single allele. 
B) multiple genes each with multiple alleles. 
C) a single gene with a single allele. 
D) a single gene with multiple alleles. 
A) multiple genes each with a single allele. 
B) multiple genes each with multiple alleles. 
C) a single gene with a single allele. 
D) a single gene with multiple alleles.

Question 6

If a healthy young couple are both carriers of cystic fibrosis,the chance that each of their future children will inherit this serious illness is

Accepted Answer

A) 0%,because cystic fibrosis is not an inherited illness. 
B) 25%. 
C) 10%. 
D) 50%. 
E) 100%. 
A) 0%,because cystic fibrosis is not an inherited illness. 
B) 25%. 
C) 10%. 
D) 50%. 
E) 100%.

Question 7

The wide variation in skin color in humans is best explained by

Accepted Answer

A) Skin color is a polygenic trait. 
B) Skin color is influenced by environmental changes like improvements in diet. 
C) Skin color is influenced by an X-linked gene. 
D) Skin color is influenced by a Y-linked gene. 
E) Skin color is influenced by crossing over. 
A) Skin color is a polygenic trait. 
B) Skin color is influenced by environmental changes like improvements in diet. 
C) Skin color is influenced by an X-linked gene. 
D) Skin color is influenced by a Y-linked gene. 
E) Skin color is influenced by crossing over.

Question 8

If any of the traits that Mendel worked with were linked genes,his dihybrid crosses

Accepted Answer

A) would have had different results. 
B) would have produced more offspring. 
C) would have produced fewer offspring. 
D) would have exhibited a typical phenotypic ratio of 9:3:3:1. 
E) would have produced sterile offspring. 
A) would have had different results. 
B) would have produced more offspring. 
C) would have produced fewer offspring. 
D) would have exhibited a typical phenotypic ratio of 9:3:3:1. 
E) would have produced sterile offspring.

Question 9

A pea plant with (Tt)as its genotype should be referred to as

Accepted Answer

A) the wild type. 
B) homozygous dominant. 
C) heterozygous. 
D) homozygous recessive. 
E) mutant. 
A) the wild type. 
B) homozygous dominant. 
C) heterozygous. 
D) homozygous recessive. 
E) mutant.

Question 10

A portion of DNA that encodes a specific protein is

Accepted Answer

A) a gene. 
B) a chromosome. 
C) a chromatid. 
D) a centromere. 
E) a kinetochorE. 
A) a gene. 
B) a chromosome. 
C) a chromatid. 
D) a centromere. 
E) a kinetochorE.

Question 11

Traits that depend on more than one gene are

Accepted Answer

A) polygenic. 
B) pleiotropic. 
C) codominant. 
D) recessive. 
E) incomplete dominant traits. 
A) polygenic. 
B) pleiotropic. 
C) codominant. 
D) recessive. 
E) incomplete dominant traits.

Question 12

If all the offspring show the dominant phenotype in a test cross,then the individual with the unknown genotype was:

Accepted Answer

A) heterozygous. 
B) homozygous dominant. 
C) homozygous recessive. 
D) a clone of the other test cross individual. 
E) heterozygous recessivE. 
A) heterozygous. 
B) homozygous dominant. 
C) homozygous recessive. 
D) a clone of the other test cross individual. 
E) heterozygous recessivE.

Question 13

Diagrams depicting family relationships and phenotypes for a genetic disorder are

Accepted Answer

A) linkage maps. 
B) pedigree charts. 
C) genotype maps. 
D) Punnett squares. 
E) bell-shaped curves. 
A) linkage maps. 
B) pedigree charts. 
C) genotype maps. 
D) Punnett squares. 
E) bell-shaped curves.

Question 14

What information is available on the outside of the boxes in the figure?

Accepted Answer

A) possible alleles the parents can pass to the offspring 
B) alleles in the gametes of the parents 
C) genotypes of the gametes 
D) genotypes of the parents 
E) All answers are correct. 
A) possible alleles the parents can pass to the offspring 
B) alleles in the gametes of the parents 
C) genotypes of the gametes 
D) genotypes of the parents 
E) All answers are correct.

Question 15

In humans,alleles are inherited from

Accepted Answer

A) females only (mothers). 
B) males only (fathers). 
C) males and females (one allele from each parent). 
D) males and females (two alleles from each parent). 
E) None of the answers are correct. 
A) females only (mothers). 
B) males only (fathers). 
C) males and females (one allele from each parent). 
D) males and females (two alleles from each parent). 
E) None of the answers are correct.

Question 16

Hemophilia A is caused by

Accepted Answer

A) an X-linked recessive disorder causing a defective blood clotting protein. 
B) an Y-linked recessive disorder. 
C) a defective neuron response. 
D) an X-linked dominant disorder causing a defective blood clotting protein. 
E) an X-linked dominant disorder. 
A) an X-linked recessive disorder causing a defective blood clotting protein. 
B) an Y-linked recessive disorder. 
C) a defective neuron response. 
D) an X-linked dominant disorder causing a defective blood clotting protein. 
E) an X-linked dominant disorder.

Question 17

An allele that exerts its effects whenever it is present is

Accepted Answer

A) recessive. 
B) dominant. 
C) homologous. 
D) homozygous. 
E) heterozygous. 
A) recessive. 
B) dominant. 
C) homologous. 
D) homozygous. 
E) heterozygous.

Question 18

If you cross RrYy and RRyy pea plants,what fraction of the offspring will have yellow peas? R=round,r=wrinkled,Y=yellow,y=green

Accepted Answer

A) 50% 
B) 75% 
C) 25% 
D) 0% 
E) 100% 
A) 50% 
B) 75% 
C) 25% 
D) 0% 
E) 100%

Question 19

What structure holds the inheritance information of a living organism?

Accepted Answer

A) chromosome 
B) monohybrid cross 
C) dihybrid cross 
D) phenotype 
E) mitosis and meiosis 
A) chromosome 
B) monohybrid cross 
C) dihybrid cross 
D) phenotype 
E) mitosis and meiosis

Question 20

A person has a recessive allele for a disease but the allele is masked by the presence of a normal dominant allele in the person.This person

Accepted Answer

A) is homozygous for the disease. 
B) cannot produce gametes. 
C) is termed a carrier. 
D) is termed a linkage group. 
E) has the disease but cannot pass this disease to their offspring. 
A) is homozygous for the disease. 
B) cannot produce gametes. 
C) is termed a carrier. 
D) is termed a linkage group. 
E) has the disease but cannot pass this disease to their offspring.

Exam 10: Patterns of Inheritance

In pedigree charts,autosomal dominant disorders typically

Alternate forms of the same gene are called

In Huntington disease,a child will typically get the disease only if one parent also has it.It is as common in boys as in girls.This disease is

In the ABO blood type system the alleles IA,IB and i produce

A single chromosome has

If a healthy young couple are both carriers of cystic fibrosis,the chance that each of their future children will inherit this serious illness is

The wide variation in skin color in humans is best explained by

If any of the traits that Mendel worked with were linked genes,his dihybrid crosses

A pea plant with (Tt)as its genotype should be referred to as

A portion of DNA that encodes a specific protein is

Traits that depend on more than one gene are

If all the offspring show the dominant phenotype in a test cross,then the individual with the unknown genotype was:

Diagrams depicting family relationships and phenotypes for a genetic disorder are

What information is available on the outside of the boxes in the figure?

In humans,alleles are inherited from

Hemophilia A is caused by

An allele that exerts its effects whenever it is present is

If you cross RrYy and RRyy pea plants,what fraction of the offspring will have yellow peas? R=round,r=wrinkled,Y=yellow,y=green

What structure holds the inheritance information of a living organism?

A person has a recessive allele for a disease but the allele is masked by the presence of a normal dominant allele in the person.This person

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In the ABO blood type system the alleles I^A,I^B and i produce