Question 1

Which is an example of a single-gene disorder that is dominant?

Accepted Answer

A)   Down syndrome
B)   nearsightedness
C)   fragile X syndrome
D)   Huntington's disease

Question 2

Age has been associated with chromosomal abnormalities in offspring in that the _____ a parent is at conception, the greater the risk of chromosomal abnormalities.

Accepted Answer

The answer of Age has been associated with chromosomal abnormalities...

Question 3

Allen learned in his college biology class that, in sex chromosomes, the _____.

Accepted Answer

A)   Y chromosome is larger than the X chromosome and has more genes
B)   X chromosome is larger than the Y chromosome and has more genes
C)   X and Y chromosomes are the same size, but the X chromosome has more genes
D)   X and Y chromosomes are the same size and have the same number of genes

Question 4

Every person begins life as a single cell, which is called a _____.

Accepted Answer

A)   chromosome
B)   zygote
C)   genotype
D)   deoxyribonucleic acid (DN
A)

Question 5

In a heterozygous pair of alleles, the phenotype reflects one allele more than the other. This is referred to as a(n)  _____.

Accepted Answer

A)   additive pattern
B)   multifactorial pattern
C)   dominant-recessive pattern
D)   polygenic pattern

Question 6

An individual's genetic inheritance is called a(n)  _____.

Accepted Answer

A)   phenotype
B)   allele
C)   genotype
D)   gamete

Question 7

Eight-year-old Joe has no difficulty seeing things near him but sometimes struggles to see things in the distance. Joe gets his eyes checked and is told that he does not yet need corrective lenses for nearsightedness. Instead, drawing on current research, the ophthalmologist advises that he _____.

Accepted Answer

A)   do homework in a very brightly lit room
B)   watch television on a larger screen
C)   play outside more
D)   avoid reading small print

Question 8

Michelle and Greg are having a baby and are hoping for a boy. _____ is the parent who is responsible for determining the sex of the baby.

Accepted Answer

The answer of Michelle and Greg are having a baby...

Question 9

Which female is more likely to naturally conceive dizygotic twins?

Accepted Answer

A)   a 20-year-old woman
B)   a 25-year-old woman
C)   a 30-year-old woman
D)   a 35-year-old woman

Question 10

Genes influence every disorder, yet with each disorder _____ can make a difference in the expression and outcome.

Accepted Answer

A)   imprinting
B)   differentiation
C)   polygenics
D)   environmental and social influences

Question 11

Jenny learned in her high school science class that a female has _____ on the 23rd pair of chromosomes.

Accepted Answer

The answer of Jenny learned in her high school science...

Question 12

In 22 of the 23 pairs of chromosomes, both members of the pair are closely matched. Each of these 44 chromosomes is called a(n)  _____.

Accepted Answer

A)   allele
B)   gamete
C)   autosome
D)   blastocyst

Question 13

_____ cells are able to produce any other cells.

Accepted Answer

The answer of _____ cells are able to produce any...

Question 14

Dizygotic twins have _____ percent of their genes in common.

Accepted Answer

A)   25
B)   50
C)   75
D)   100

Question 15

A common reason that couples do not seek genetic counseling is that _____.

Accepted Answer

A)   they have never been exposed to teratogens
B)   they already eat a well-balanced diet
C)   their pregnancy is unplanned
D)   they are well over the age of 35

Question 16

A small section of a chromosome that is the basic unit for the transmission of heredity is a _____.

Accepted Answer

A)   gamete
B)   gene
C)   genotype
D)   zygote

Question 17

Genes affect disorders such as alcohol use disorder and nearsightedness, but research indicates that the environment plays a role as well.

Accepted Answer

A) True 
 B)False

Question 18

Which mother is at greatest risk of having a child with a chromosomal abnormality?

Accepted Answer

A)   a 20-year-old mother
B)   a 30-year-old mother
C)   a 35-year-old mother
D)   a 40-year-old mother

Question 19

Who is most likely to benefit from preconception, prenatal, or even prenuptial (before marriage)  genetic counseling?

Accepted Answer

A)   women over age 35 and men over age 40
B)   couples who already have children
C)   couples who have never had a spontaneous abortion or stillbirth
D)   women who are younger than 25 and men who are younger than 30

Question 20

On the 23rd pair of chromosomes, males have _____.

Accepted Answer

A)   two X chromosomes
B)   two Y chromosomes
C)   an X chromosome and a Y chromosome
D)   just a Y chromosome

Exam 3: The New Genetics

Jenny learned in her high school science class that a female has _____ on the 23rd pair of chromosomes.

Correct AnswerverifiedShow Answer

Dizygotic twins have _____ percent of their genes in common.

Correct AnswerverifiedShow Answer

In 22 of the 23 pairs of chromosomes, both members of the pair are closely matched. Each of these 44 chromosomes is called a(n) _____.

Correct AnswerverifiedShow Answer

Michelle and Greg are having a baby and are hoping for a boy. _____ is the parent who is responsible for determining the sex of the baby.

Correct AnswerverifiedShow Answer

Who is most likely to benefit from preconception, prenatal, or even prenuptial (before marriage) genetic counseling?

Correct AnswerverifiedShow Answer

A small section of a chromosome that is the basic unit for the transmission of heredity is a _____.

Correct AnswerverifiedShow Answer

Genes influence every disorder, yet with each disorder _____ can make a difference in the expression and outcome.

Correct AnswerverifiedShow Answer

A common reason that couples do not seek genetic counseling is that _____.

Correct AnswerverifiedShow Answer

Age has been associated with chromosomal abnormalities in offspring in that the _____ a parent is at conception, the greater the risk of chromosomal abnormalities.

Correct AnswerverifiedShow Answer

An individual's genetic inheritance is called a(n) _____.

Correct AnswerverifiedShow Answer

Every person begins life as a single cell, which is called a _____.

Correct AnswerverifiedShow Answer

Which female is more likely to naturally conceive dizygotic twins?

Correct AnswerverifiedShow Answer

_____ cells are able to produce any other cells.

Correct AnswerverifiedShow Answer

On the 23rd pair of chromosomes, males have _____.

Correct AnswerverifiedShow Answer

In a heterozygous pair of alleles, the phenotype reflects one allele more than the other. This is referred to as a(n) _____.

Correct AnswerverifiedShow Answer

Eight-year-old Joe has no difficulty seeing things near him but sometimes struggles to see things in the distance. Joe gets his eyes checked and is told that he does not yet need corrective lenses for nearsightedness. Instead, drawing on current research, the ophthalmologist advises that he _____.

Correct AnswerverifiedShow Answer

Genes affect disorders such as alcohol use disorder and nearsightedness, but research indicates that the environment plays a role as well.

Correct AnswerverifiedShow Answer

Which is an example of a single-gene disorder that is dominant?

Correct AnswerverifiedShow Answer

Allen learned in his college biology class that, in sex chromosomes, the _____.

Correct AnswerverifiedShow Answer

Which mother is at greatest risk of having a child with a chromosomal abnormality?

Correct AnswerverifiedShow Answer

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