Question 1

In humans,the inheritance of ________ is best explained as being polygenic.

Accepted Answer

A) cystic fibrosis 
B) height 
C) blood type 
D) sickle-cell disease 
A) cystic fibrosis 
B) height 
C) blood type 
D) sickle-cell disease

Question 2

In humans,free earlobes (E)are dominant to attached earlobes (e)and the presence of freckles (F)is dominant to the absence of freckles (f).If an individual heterozygous for both of these traits were to mate with an individual with attached earlobes and no freckles,what is the probability of having a child with attached earlobes and freckles?

Accepted Answer

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

Question 3

According to Mendel's law of segregation,________.

Accepted Answer

A) two alleles segregate into each gamete 
B) more gametes carrying the dominant allele are produced than gametes carrying the recessive allele 
C) gametes have one allele copy for each gene 
D) gametes are diploid 
A) two alleles segregate into each gamete 
B) more gametes carrying the dominant allele are produced than gametes carrying the recessive allele 
C) gametes have one allele copy for each gene 
D) gametes are diploid

Question 4

What is the key to the recognition of incomplete dominance?

Accepted Answer

A) The phenotype of the heterozygote falls between the phenotypes of the homozygotes. 
B) The trait exhibits a continuous distribution. 
C) The alleles affect more than one trait. 
D) The heterozygote expresses the phenotype of both homozygotes. 
A) The phenotype of the heterozygote falls between the phenotypes of the homozygotes. 
B) The trait exhibits a continuous distribution. 
C) The alleles affect more than one trait. 
D) The heterozygote expresses the phenotype of both homozygotes.

Question 5

Which of these crosses will produce only heterozygous offspring?

Accepted Answer

A) AA × aa 
B) AA × Aa 
C) Aa × Aa 
D) Aa × aa 
A) AA × aa 
B) AA × Aa 
C) Aa × Aa 
D) Aa × aa

Question 6

Mendel crossed purebred purple-flowered plants with purebred white-flowered plants,and all of the resulting offspring produced purple flowers.The offspring are all ________,and the allele for purple flowers is ________.

Accepted Answer

A) heterozygotes...recessive 
B) heterozygotes...dominant 
C) homozygotes...recessive 
D) homozygotes...dominant 
A) heterozygotes...recessive 
B) heterozygotes...dominant 
C) homozygotes...recessive 
D) homozygotes...dominant

Question 7

Please read the following scenario to answer the following questions.
Widow's peak,a pointed hairline on the forehead,is a genetic trait caused by a dominant allele.It can be traced back through a family's history using pedigree analysis.
The pedigree shown here is of three generations of a family.Notice that some individuals (shown in gray)have a widow's peak (W = dominant allele and w = recessive allele).
  
-Janice's genotype is ________.

Accepted Answer

A) Ww 
B) WW 
C) ww 
D) WW or Ww 
A) Ww 
B) WW 
C) ww 
D) WW or Ww

Question 8

What data or test would you seek to determine whether or not a trait is sex linked?

Accepted Answer

A) karyotype 
B) pedigree 
C) DNA sequence 
D) blood test 
A) karyotype 
B) pedigree 
C) DNA sequence 
D) blood test

Question 9

Which of the following techniques is used to collect fetal cells during pregnancy for genetic testing?

Accepted Answer

A) testcross 
B) dihybrid cross 
C) amniocentesis 
D) pedigree analysis 
A) testcross 
B) dihybrid cross 
C) amniocentesis 
D) pedigree analysis

Question 10

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The F₁ plants have yellow seeds.What is the expected phenotypic ratio of seed color of the offspring of an F₁ × F₁ cross?

Accepted Answer

A) 1:2:1 
B) 2:1 
C) 3:1 
D) 9:3:3:1 
A) 1:2:1 
B) 2:1 
C) 3:1 
D) 9:3:3:1

Question 11

Please read the following scenario to answer the following questions.
Widow's peak,a pointed hairline on the forehead,is a genetic trait caused by a dominant allele.It can be traced back through a family's history using pedigree analysis.
The pedigree shown here is of three generations of a family.Notice that some individuals (shown in gray)have a widow's peak (W = dominant allele and w = recessive allele).
  
-Mary has the genotype ________.

Accepted Answer

A) WW 
B) ww 
C) Ww 
D) More information is needed. 
A) WW 
B) ww 
C) Ww 
D) More information is needed.

Question 12

The best definition of a purebred plant is one that ________.

Accepted Answer

A) cannot be cross-fertilized 
B) self-fertilizes to produce offspring identical to the parent 
C) produces sterile offspring when cross-fertilized 
D) self-fertilizes to produce hybrid offspring 
A) cannot be cross-fertilized 
B) self-fertilizes to produce offspring identical to the parent 
C) produces sterile offspring when cross-fertilized 
D) self-fertilizes to produce hybrid offspring

Question 13

An individual heterozygous for cystic fibrosis ________.

Accepted Answer

A) cannot have children with cystic fibrosis 
B) is a carrier 
C) will have children who are all carriers of cystic fibrosis 
D) has cystic fibrosis 
A) cannot have children with cystic fibrosis 
B) is a carrier 
C) will have children who are all carriers of cystic fibrosis 
D) has cystic fibrosis

Question 14

A couple has two female children.What is the probability that their next child will be male?

Accepted Answer

A) 25% 
B) 50% 
C) 33% 
D) 67% 
A) 25% 
B) 50% 
C) 33% 
D) 67%

Question 15

Round seeds (R)are dominant to wrinkled seeds (r),and yellow seeds (Y)are dominant to green seeds (y).What is the expected phenotypic ratio of a cross between an RrYy and an rryy individual?

Accepted Answer

A) 1:2:1 
B) 9:3:3:1 
C) 3:1 
D) 1:1:1:1 
A) 1:2:1 
B) 9:3:3:1 
C) 3:1 
D) 1:1:1:1

Question 16

A mating between a purebred purple-flowered pea plant and a purebred white-flowered pea plant would produce a(n)________.

Accepted Answer

A) purebred variety 
B) hybrid 
C) P generation 
D) F₂ generation 
A) purebred variety 
B) hybrid 
C) P generation 
D) F₂ generation

Question 17

An individual who is homozygous ________.

Accepted Answer

A) expresses the dominant trait 
B) carries two different alleles for a gene 
C) carries two copies of the same allele for a gene 
D) expresses the recessive trait 
A) expresses the dominant trait 
B) carries two different alleles for a gene 
C) carries two copies of the same allele for a gene 
D) expresses the recessive trait

Question 18

Many human traits,such as our performance on intelligence tests or our susceptibility to heart disease,are ________.

Accepted Answer

A) determined only by our genes 
B) influenced by both genes and the environment 
C) determined by genes in some people and by the environment in other people 
D) not affected by our genes 
A) determined only by our genes 
B) influenced by both genes and the environment 
C) determined by genes in some people and by the environment in other people 
D) not affected by our genes

Question 19

Linked genes are usually ________.

Accepted Answer

A) found on the X chromosome 
B) found on the Y chromosome 
C) codominant 
D) located close together on a chromosome 
A) found on the X chromosome 
B) found on the Y chromosome 
C) codominant 
D) located close together on a chromosome

Question 20

To determine the phenotype of an individual who expresses a dominant trait,you would cross that individual with an individual who ________.

Accepted Answer

A) expresses the dominant trait 
B) is homozygous recessive for that trait 
C) is homozygous dominant for that trait 
D) is heterozygous for that trait 
A) expresses the dominant trait 
B) is homozygous recessive for that trait 
C) is homozygous dominant for that trait 
D) is heterozygous for that trait

Exam 9: Patterns of Inheritance

In humans,the inheritance of ________ is best explained as being polygenic.

According to Mendel's law of segregation,________.

What is the key to the recognition of incomplete dominance?

Which of these crosses will produce only heterozygous offspring?

Mendel crossed purebred purple-flowered plants with purebred white-flowered plants,and all of the resulting offspring produced purple flowers.The offspring are all ________,and the allele for purple flowers is ________.

What data or test would you seek to determine whether or not a trait is sex linked?

Which of the following techniques is used to collect fetal cells during pregnancy for genetic testing?

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds.The F₁ plants have yellow seeds.What is the expected phenotypic ratio of seed color of the offspring of an F₁ × F₁ cross?

The best definition of a purebred plant is one that ________.

An individual heterozygous for cystic fibrosis ________.

A couple has two female children.What is the probability that their next child will be male?

Round seeds (R)are dominant to wrinkled seeds (r),and yellow seeds (Y)are dominant to green seeds (y).What is the expected phenotypic ratio of a cross between an RrYy and an rryy individual?

A mating between a purebred purple-flowered pea plant and a purebred white-flowered pea plant would produce a(n)________.

An individual who is homozygous ________.

Many human traits,such as our performance on intelligence tests or our susceptibility to heart disease,are ________.

Linked genes are usually ________.

To determine the phenotype of an individual who expresses a dominant trait,you would cross that individual with an individual who ________.

Introduction: Biology Today

Essential Chemistry for Biology

The Molecules of Life

A Tour of the Cell

The Working Cell

Cellular Respiration: Obtaining Energy From Food

Photosynthesis: Using Light to Make Food

Cellular Reproduction: Cells From Cells

The Structure and Function of Dna

How Genes Are Controlled

DNA Technology

How Populations Evolve

How Biological Diversity Evolves

The Evolution of Microbial Life

The Evolution of Plants and Fungi

The Evolution of Animals

An Introduction to Ecology and the Biosphere

Population Ecology

Communities and Ecosystems

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Circulation and Respiration

The Bodys Defenses

Hormones

Reproduction and Development

Nervous,Sensory,and Locomotor Systems

The Life of a Flowering Plant

The Working Plant

Filters

Mendel crossed purebred purple-flowered plants with purebred white-flowered plants,and all of the resulting offspring produced purple flowers.The offspring are all ,and the allele for purple flowers is .