Question 1

A gene is the genetic code for:

Accepted Answer

A) one protein 
B) one cell 
C) one chromosome 
D) one organ 
A) one protein 
B) one cell 
C) one chromosome 
D) one organ A

Question 2

A person who is heterozygous for a particular trait has:

Accepted Answer

A) an extra gene (allele) 
B) two similar genes (alleles) 
C) only one gene (allele) 
D) two different genes (alleles) 
A) an extra gene (allele) 
B) two similar genes (alleles) 
C) only one gene (allele) 
D) two different genes (alleles) D

Question 3

After birth,the infant's pulmonary circulation is increased because the foramen ovale ___ and the ductus arteriosus ___.

Accepted Answer

A) is closed/constricts 
B) is opened/constricts 
C) is closed/dilates 
D) is opened/dilates 
A) is closed/constricts 
B) is opened/constricts 
C) is closed/dilates 
D) is opened/dilates A

Question 4

A person who has two similar genes for a particular trait is said to be:

Accepted Answer

A) homologous 
B) homozygous 
C) heterologous 
D) heterozygous 
A) homologous 
B) homozygous 
C) heterologous 
D) heterozygous

Question 5

A person's phenotype for a particular trait refers to the:

Accepted Answer

A) genes that are present 
B) genes that are absent 
C) expression or appearance of the trait 
D) possibility that the genes will be passed to children 
A) genes that are present 
B) genes that are absent 
C) expression or appearance of the trait 
D) possibility that the genes will be passed to children

Question 6

The sex chromosomes in men are called:

Accepted Answer

A) XX 
B) YY 
C) XY 
D) XZ 
A) XX 
B) YY 
C) XY 
D) XZ

Question 7

If a trait may appear in the phenotype only when two genes for it are present,that trait is called:

Accepted Answer

A) weak 
B) recessive 
C) binomial 
D) expressive 
A) weak 
B) recessive 
C) binomial 
D) expressive

Question 8

For people,curly hair is dominant and straight hair is recessive.Genetics problem: Mom has straight hair and Dad is homozygous for curly hair.The chance that their child will have straight hair is:

Accepted Answer

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

Question 9

The placental hormone that inhibits contractions of the myometrium during pregnancy is:

Accepted Answer

A) FSH 
B) hCG 
C) estrogen 
D) progesterone 
A) FSH 
B) hCG 
C) estrogen 
D) progesterone

Question 10

Blood is carried from the fetus to the placenta by the:

Accepted Answer

A) ductus arteriosus 
B) umbilical vein 
C) blood sinuses 
D) umbilical arteries 
A) ductus arteriosus 
B) umbilical vein 
C) blood sinuses 
D) umbilical arteries

Question 11

The embryonic membrane that contains fluid to cushion the embryo is the:

Accepted Answer

A) chorion 
B) amnion 
C) yolk sac 
D) umbilical cord 
A) chorion 
B) amnion 
C) yolk sac 
D) umbilical cord

Question 12

A zygote begins a series of cell divisions called:

Accepted Answer

A) differentiation,and the process is mitosis 
B) cleavage,and the process is meiosis 
C) differentiation,and the process is meiosis 
D) cleavage,and the process is mitosis 
A) differentiation,and the process is mitosis 
B) cleavage,and the process is meiosis 
C) differentiation,and the process is meiosis 
D) cleavage,and the process is mitosis

Question 13

The placental hormones that prepare the mammary glands for lactation are:

Accepted Answer

A) progesterone and hCG 
B) hCG and estrogen 
C) estrogen and progesterone 
D) progesterone and relaxin 
A) progesterone and hCG 
B) hCG and estrogen 
C) estrogen and progesterone 
D) progesterone and relaxin

Question 14

A person has two genes for each genetic trait; these genes are called:

Accepted Answer

A) positive and negative 
B) maternal and paternal 
C) present and absent 
D) dominant and recessive 
A) positive and negative 
B) maternal and paternal 
C) present and absent 
D) dominant and recessive

Question 15

In the early embryo,the ectoderm gives rise to the:

Accepted Answer

A) nerves 
B) dermis and fat 
C) lungs 
D) bones 
A) nerves 
B) dermis and fat 
C) lungs 
D) bones

Question 16

The stage of labor during which the amniotic sac ruptures is the:

Accepted Answer

A) first stage 
B) second stage 
C) third stage 
D) fourth stage 
A) first stage 
B) second stage 
C) third stage 
D) fourth stage

Question 17

The portion of the blastocyst that contains the potential embryo is the:

Accepted Answer

A) ectoderm 
B) trophoblast 
C) inner cell mass 
D) endoderm 
A) ectoderm 
B) trophoblast 
C) inner cell mass 
D) endoderm

Question 18

In the early embryo,the nervous system and epidermis are derived from the:

Accepted Answer

A) ectoderm 
B) mesoderm 
C) endoderm 
D) intraderm 
A) ectoderm 
B) mesoderm 
C) endoderm 
D) intraderm

Question 19

A human zygote contains how many chromosomes?

Accepted Answer

A) 23 
B) 46 
C) 46 pairs 
D) 23 pairs plus two sex chromosomes 
A) 23 
B) 46 
C) 46 pairs 
D) 23 pairs plus two sex chromosomes

Question 20

In order for a dominant trait to appear in the phenotype:

Accepted Answer

A) no genes for it must be present 
B) two genes for it must be present 
C) only one gene for it has to be present 
D) None of these are true. 
A) no genes for it must be present 
B) two genes for it must be present 
C) only one gene for it has to be present 
D) None of these are true.

Exam 22:Human Development and Genetics-Part C

A gene is the genetic code for:

A person who is heterozygous for a particular trait has:

After birth,the infant's pulmonary circulation is increased because the foramen ovale ___ and the ductus arteriosus ___.

A person who has two similar genes for a particular trait is said to be:

A person's phenotype for a particular trait refers to the:

The sex chromosomes in men are called:

If a trait may appear in the phenotype only when two genes for it are present,that trait is called:

For people,curly hair is dominant and straight hair is recessive.Genetics problem: Mom has straight hair and Dad is homozygous for curly hair.The chance that their child will have straight hair is:

The placental hormone that inhibits contractions of the myometrium during pregnancy is:

Blood is carried from the fetus to the placenta by the:

The embryonic membrane that contains fluid to cushion the embryo is the:

A zygote begins a series of cell divisions called:

The placental hormones that prepare the mammary glands for lactation are:

A person has two genes for each genetic trait; these genes are called:

In the early embryo,the ectoderm gives rise to the:

The stage of labor during which the amniotic sac ruptures is the:

The portion of the blastocyst that contains the potential embryo is the:

In the early embryo,the nervous system and epidermis are derived from the:

A human zygote contains how many chromosomes?

In order for a dominant trait to appear in the phenotype:

Organization and General Plan of the Body-Part A

Organization and General Plan of the Body-Part B

Organization and General Plan of the Body-Part C

Some Basic Chemistry-Part A

Some Basic Chemistry-Part B

Some Basic Chemistry-Part C

Cells-Part A

Cells-Part B

Cells-Part C

Tissues and Membranes-Part A

Tissues and Membranes-Part B

Tissues and Membranes-Part C

The Integumentary System-Part A

The Integumentary System-Part B

The Integumentary System-Part C

The Skeletal System-Part A

The Skeletal System-Part B

The Skeletal System-Part C

The Muscular System-Part A

The Muscular System-Part B

The Muscular System-Part C

The Nervous System-Part A

The Nervous System-Part B

The Nervous System-Part C

The Senses-Part A

The Senses-Part B

The Senses-Part C

The Endocrine System-Part A

The Endocrine System-Part B

The Endocrine System-Part C

Blood-Part A

Blood-Part B

Blood-Part C

The Heart-Part A

The Heart-Part B

The Heart-Part C

The Vascular System-Part A

The Vascular System-Part B

The Vascular System-Part C

The Lymphatic System and Immunity-Part A

The Lymphatic System and Immunity-Part B

The Lymphatic System and Immunity-Part C

The Respiratory System-Part A

The Respiratory System-Part B

The Respiratory System-Part C

The Digestive System-Part A

The Digestive System-Part B

The Digestive System-Part C

Body Temperature and Metabolism-Part A

Body Temperature and Metabolism-Part B

Body Temperature and Metabolism-Part C

The Urinary System-Part A

The Urinary System-Part B

The Urinary System-Part C

Fluid–Electrolyte and Acid–Base Balance-Part A

Fluid–Electrolyte and Acid–Base Balance-Part B

Fluid–Electrolyte and Acid–Base Balance-Part C

The Reproductive Systems-Part A

The Reproductive Systems-Part B

After birth,the infant's pulmonary circulation is increased because the foramen ovale _ and the ductus arteriosus _.