Question 1

Which of the following statements is true about sex ratios?

Accepted Answer

A)  Based on production of sperm, we would expect the sex ratio to be 2 males for every 1 female. 
B)  More females than males are conceived. 
C)  By 20 years of age, the ratio of males to females is 1:1. 
D)  About the same number of males and females are born. 
E)  By 60 years of age, there are more males than females. 
A)  Based on production of sperm, we would expect the sex ratio to be 2 males for every 1 female. 
B)  More females than males are conceived. 
C)  By 20 years of age, the ratio of males to females is 1:1. 
D)  About the same number of males and females are born. 
E)  By 60 years of age, there are more males than females.

Question 2

How many sperm usually enter an egg?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 3

Distinguish between chromosomal,gonadal,and phenotypic stages of sex development for a male.When does each occur and what is the key feature of each?

Accepted Answer

Chromosomal sex is determined at fertili

Question 4

Sperm containing the X chromosome have more DNA than sperm containing the Y chromosome and therefore glow brighter in the sperm sorting procedure.

Accepted Answer

A) True 
 B)False

Question 5

Gonadal sex is determined

Accepted Answer

A)  at fertilization. 
B)  at birth. 
C)  upon the formation of external genitalia. 
D)  when the presence or absence of the SRY gene determines the formation of testes or ovaries. 
E)  when either testosterone or estrogen is produced. 
A)  at fertilization. 
B)  at birth. 
C)  upon the formation of external genitalia. 
D)  when the presence or absence of the SRY gene determines the formation of testes or ovaries. 
E)  when either testosterone or estrogen is produced.

Question 6

The X and Y chromosomes of the human genome are termed the sex chromosomes.Explain how the sex chromosome complement for a normal female and a normal male is determined at fertilization.

Accepted Answer

Since females only have two X chromosome

Question 7

What are the different parts of a blastocyst?

Accepted Answer

A)  Inner cell mass 
B)  Inner cavity 
C)  Middle layer of cells 
D)  Inner cell mass and inner cavity 
E)  All of these . 
A)  Inner cell mass 
B)  Inner cavity 
C)  Middle layer of cells 
D)  Inner cell mass and inner cavity 
E)  All of these .

Question 8

Match the description to the number of chromosomes.
-45

Accepted Answer

A) normal number of chromosomes in humans 
B) number of autosomal chromosomal pairs 
C) number of chromosomes present in an individual with Kleinfelter syndrome 
D) number of chromosomes present in an individual with Turner syndrome 
A) normal number of chromosomes in humans 
B) number of autosomal chromosomal pairs 
C) number of chromosomes present in an individual with Kleinfelter syndrome 
D) number of chromosomes present in an individual with Turner syndrome

Question 9

In males,the development of internal and external sex organs depends on the actions of the SRY gene located on the Y chromosome.

Accepted Answer

A) True 
 B)False

Question 10

Intersexuality

Accepted Answer

A)  is determined only by the number of sex chromosomes an individual possesses. 
B)  is a condition in which the chromosomal and phenotypic sex of an individual match. 
C)  describes a condition in which an individual's phenotype cannot be classified as either male or female. 
D)  is determined only by the autosomes an individual possesses. 
E)  is determined at fertilization. 
A)  is determined only by the number of sex chromosomes an individual possesses. 
B)  is a condition in which the chromosomal and phenotypic sex of an individual match. 
C)  describes a condition in which an individual's phenotype cannot be classified as either male or female. 
D)  is determined only by the autosomes an individual possesses. 
E)  is determined at fertilization.

Question 11

MATCHING
Match the appropriate chromosomal composition to the sex of the individual.
-XXY

Accepted Answer

A) Female 
B) Male 
A) Female 
B) Male

Question 12

Complete androgen insensitivity is genetically controlled.

Accepted Answer

A) True 
 B)False

Question 13

During which trimester(s)does the most rapid fetal growth take place?

Accepted Answer

A)  first trimester 
B)  second trimester 
C)  third trimester 
D)  There is equal fetal growth in all trimesters. 
E)  It varies depending on each individual pregnancy. 
A)  first trimester 
B)  second trimester 
C)  third trimester 
D)  There is equal fetal growth in all trimesters. 
E)  It varies depending on each individual pregnancy.

Question 14

MATCHING
Match the appropriate chromosomal composition to the sex of the individual.
-XX

Accepted Answer

A) Female 
B) Male 
A) Female 
B) Male

Question 15

Sex testing in the Olympics prior to 2000 was based on

Accepted Answer

A)  testosterone levels. 
B)  the presence or absence of the Y chromosome. 
C)  ultrasound scanning. 
D)  the presence or absence of Barr bodies. 
E)  estrogen levels. 
A)  testosterone levels. 
B)  the presence or absence of the Y chromosome. 
C)  ultrasound scanning. 
D)  the presence or absence of Barr bodies. 
E)  estrogen levels.

Question 16

Match the description to the number of chromosomes.
-46

Accepted Answer

A) normal number of chromosomes in humans 
B) number of autosomal chromosomal pairs 
C) number of chromosomes present in an individual with Kleinfelter syndrome 
D) number of chromosomes present in an individual with Turner syndrome 
A) normal number of chromosomes in humans 
B) number of autosomal chromosomal pairs 
C) number of chromosomes present in an individual with Kleinfelter syndrome 
D) number of chromosomes present in an individual with Turner syndrome

Question 17

In females,one X chromosome out of the two becomes a Barr body.

Accepted Answer

A) True 
 B)False

Question 18

When can the mother usually feel movements of the fetus' arms and legs?

Accepted Answer

A)  within days after fertilization 
B)  during the second month 
C)  around the fourth month 
D)  not until the third trimester 
E)  only in the last two months of pregnancy 
A)  within days after fertilization 
B)  during the second month 
C)  around the fourth month 
D)  not until the third trimester 
E)  only in the last two months of pregnancy

Question 19

Explain why the sex ratio for humans changes over time.

Accepted Answer

Although we cannot be completely certain

Question 20

Individuals with complete androgen insensitivity

Accepted Answer

A)  menstruate after reaching puberty. 
B)  are phenotypically males. 
C)  often have testes present in their abdomens. 
D)  usually have no problems reproducing. 
E)  have a set of XX sex chromosomes. 
A)  menstruate after reaching puberty. 
B)  are phenotypically males. 
C)  often have testes present in their abdomens. 
D)  usually have no problems reproducing. 
E)  have a set of XX sex chromosomes.

Which of the following statements is true about sex ratios?

How many sperm usually enter an egg?

Distinguish between chromosomal,gonadal,and phenotypic stages of sex development for a male.When does each occur and what is the key feature of each?

Sperm containing the X chromosome have more DNA than sperm containing the Y chromosome and therefore glow brighter in the sperm sorting procedure.

Gonadal sex is determined

The X and Y chromosomes of the human genome are termed the sex chromosomes.Explain how the sex chromosome complement for a normal female and a normal male is determined at fertilization.

What are the different parts of a blastocyst?

Match the description to the number of chromosomes. -45

In males,the development of internal and external sex organs depends on the actions of the SRY gene located on the Y chromosome.

Intersexuality

MATCHING Match the appropriate chromosomal composition to the sex of the individual. -XXY

Complete androgen insensitivity is genetically controlled.

During which trimester(s)does the most rapid fetal growth take place?

MATCHING Match the appropriate chromosomal composition to the sex of the individual. -XX

Sex testing in the Olympics prior to 2000 was based on

Match the description to the number of chromosomes. -46

In females,one X chromosome out of the two becomes a Barr body.

When can the mother usually feel movements of the fetus' arms and legs?

Explain why the sex ratio for humans changes over time.

Individuals with complete androgen insensitivity

Assisted Reproductive Technology

Changes in Chromosome Number

How Genes Are Transmitted From Generation to Generation

Gene Expression and Gene Regulation

Changes in DNA: Mutations and Epigenetics

Biotechnology

Genetic Testing and Prenatal Diagnosis

DNA Forensics

Genomics

Inheritance of Complex Traits

Cancer and the Cell Cycle

Behavior

Immunogenetics

Genetics and Populations

Human Evolution

A Different World: The Past, Present, and Future of Human Genetics

Biology Basics 1-Cells and Cell Structure

Biology Basics 2-DNA and RNA

Biology Basics 3-Genes, Populations, and the Environment

Filters

Exam 1: Sex and Development

Which of the following statements is true about sex ratios?

How many sperm usually enter an egg?

Distinguish between chromosomal,gonadal,and phenotypic stages of sex development for a male.When does each occur and what is the key feature of each?

Sperm containing the X chromosome have more DNA than sperm containing the Y chromosome and therefore glow brighter in the sperm sorting procedure.

Gonadal sex is determined

The X and Y chromosomes of the human genome are termed the sex chromosomes.Explain how the sex chromosome complement for a normal female and a normal male is determined at fertilization.

What are the different parts of a blastocyst?

Match the description to the number of chromosomes. -45

In males,the development of internal and external sex organs depends on the actions of the SRY gene located on the Y chromosome.

Intersexuality

MATCHING Match the appropriate chromosomal composition to the sex of the individual. -XXY

Complete androgen insensitivity is genetically controlled.

During which trimester(s)does the most rapid fetal growth take place?

MATCHING Match the appropriate chromosomal composition to the sex of the individual. -XX

Sex testing in the Olympics prior to 2000 was based on

Match the description to the number of chromosomes. -46

In females,one X chromosome out of the two becomes a Barr body.

When can the mother usually feel movements of the fetus' arms and legs?

Explain why the sex ratio for humans changes over time.

Individuals with complete androgen insensitivity

Assisted Reproductive Technology

Changes in Chromosome Number

How Genes Are Transmitted From Generation to Generation

Gene Expression and Gene Regulation

Changes in DNA: Mutations and Epigenetics

Biotechnology

Genetic Testing and Prenatal Diagnosis

DNA Forensics

Genomics

Inheritance of Complex Traits

Cancer and the Cell Cycle

Behavior

Immunogenetics

Genetics and Populations

Human Evolution

A Different World: The Past, Present, and Future of Human Genetics

Biology Basics 1-Cells and Cell Structure

Biology Basics 2-DNA and RNA

Biology Basics 3-Genes, Populations, and the Environment

Filters