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A & P II Final (Review 11)
Chapter 24: Genetics and Genomics
50
Anatomy
Undergraduate 2
11/27/2010

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Cards

Term
Within a set of human chromosomes, 22 pairs are called _______. 
Definition
autosomes
Term

Which of the following is true regarding egg cells?

 

A) They always contain an X chromosome.

B) They contain an X or Y chromosome.

C) They contain 23 pairs of chromosomes.

D) None of these is correct.

Definition
A) They always contain an X chromosome
Term

A color-blind male child always receives the gene for color blindness from his mother.

 

True or False

Definition
True
Term
When is the chromosome number reduced by one-half during gametogenisis?
Definition
during the first meiotic division
Term
Hemophilia is _______________.
Definition
characterized by a defect in the clotting mechanism
Term
________ inheritance is due to recessive genes located on X chromosomes.
Definition
X-linked
Term
If an egg cell without an X chromosme is fertilized by an X-bearing sperm cell, then this will result in _________.
Definition
Turner's syndrome
Term

Nondisjunction in which homologous autosomes do not separate, therefore a cell receives an extra chromosome, results in:

 

A) Patau's syndrome

B) Edward's syndrome

C) Down's syndrome

D) All of these are correct

Definition
D) all of these are correct
Term

The chromosomes of a set that contain similar genetic material compromise a(n) ______.

 

 

Definition
homologous pair
Term
X-linked genes are always expressed more frequently in males than in females due to the fact that _________.
Definition
there is no allele on Y chromosomes
Term
A procedure used to obtain enough fetal tissue to test for genetic disorders by culturing cells is called _________.
Definition
amniocentesis
Term
When the alleles of a gene pair are identical they are said to be __________.
Definition
homozygous
Term
In a simple dominant-recessive inheritance pattern, what percentage of the offspring would be expected to exhibit the dominant trait if the parents were heterozygous and homozygous-recessive?
Definition
50%
Term
If the parent genotypes are AA and aa, the offspring are expected to be ____.
Definition
all Aa.
Term
The portion of a DNA molecule that contains the information for producting one kind of protein is called a(n) ________.
Definition
gene
Term

If one parent has sickle cell anemia and the other parent is normal, the chance of a child with sickle cell anemia is 50%.

 

True or False

Definition
False
Term
The significance of synapsis during meiosis is that ______________.
Definition
intertwined chromosomes may break and exhange parts
Term
If a Y-bearing sperm cell fertilizes a normal egg cell, the zygote will be a ______.
Definition
male
Term
Genetics is the study of _________.
Definition
inherited variation
Term

The phenotypes expected from the cross of a color-blind male and a normal (homozygous dominant) female are:

 

 

Definition
all males and females have normal color vision
Term
If the blood type gene IO is present in the genotype, the person cannot have blood of type ____.
Definition
AB
Term
An example of a sex-influenced trait is ______.
Definition
baldness
Term
A gene that is not expressed in the heterozygous condition is called _________.
Definition
recessive
Term
Dominant genes in a genotype are designated by _______.
Definition
being capitalized
Term
Homologous pairs of chromosomes are ____________.
Definition
chromosomes from the mother and father that contain similar genetic information
Term
A gene is defined as a _____________.
Definition
portion of a DNA molecule that contains the information for producing one kind of protein molecule
Term
In meiosis, crossing over occurs during the ___________.
Definition
first meiotic division
Term
The phenotypes that would result from the cross of H1H2 and H1H2 (H1 represents the normal gene for hemoglobin and H2 represents the incomplete dominant allele that causes the formation of abnormal hemoglobin are: 
Definition
25% normal, 50% sickle cell trait, 25% sickle cell anemia.
Term
A person with type A blood could have the genotype _________.
Definition
IAIA or IAIO
Term
An example of a homozygous gene pair is _____.
Definition
AA
Term

Which of the following would not be a possible blood type for the baby of a mother with type AB and a father with type B blood?

 

A) AB

B) A

C) B

D) O

Definition
D) O
Term
The origin of the 46 chromosomes in a human zygote is _____________.
Definition
half from the sperm and half from the egg
Term

The particular combination of genes present within a zygote constitutes its genotype.

 

True or False

Definition
True
Term
Incomplete dominance is defined as _____________.
Definition
gene pairs occurring in two forms that are expressed differently and neither is dominant to the other
Term
If the parent genotypes are Aa and Aa, the offspring are expected to be:
Definition
1/4 AA, 1/2 Aa, 1/4 aa.
Term
An individual who is homozygous dominant for a trait can be symbolized ____.
Definition
AA
Term

The total number of chromosomes found within a human zygote is 23. 

 

True or False

Definition
False
Term
During which stage in mitosis are genes and chromosomes duplicated?
Definition
interphase
Term

A normal male has the sex chromosome combination XX.

 

True or False

Definition
False
Term

If a color-blind male is married to a homozygous dominant (normal) female, the possible offspring are:

 

 

Definition
all offspring normal
Term
Genetic transmission of genes located within a portion of the Y chromosome for which there is no homologous region in the X chromosome is called ________.
Definition
holandric inheritance
Term
The genotypes and phenotypes that would result from the cross of Aa and Aa (A = normal pigmentation and a = albinism) are:
Definition
phenotypes-3/4 normal and 1/4 albino; genotypes-1/4 homozygous dominant, 1/2 heterozygous, and 1/4 homozygous recessive.
Term
The phenotypes and genotypes that would result from a cross of Aa and aa (A = normal pigmentation and a = albinism) are:
Definition
phenotypes-half normal and half albine; genotypes-half heterozygous and half homozygous recessive
Term
The genotypes and pheotypes that would result from a cross of AA and Aa (A = normal pigmentation and a = albinism) are:
Definition
phenotypes-all normal; genotypes-50% homozygous dominant and 50% heterozygous.
Term
Down's syndrome is caused by _______.
Definition
nondisjunction
Term

Which of the following is true in regard to the determination of the gender of a baby?

 

A) The sex chromosome in the egg determines the gender of the baby

B) The sex chromosome in the sperm determines the gender of the baby

C) The cells of all babies contain the same sex chromosomes.

D) None of these is correct

Definition
B) The sex chromosome in the sperm determines the gender of the baby
Term
The phenotypes expected from the cross of a color-blind female and a normal male are:
Definition
all females have normal color vision and all males are color blind.
Term
When the alleles of a gene pair are different they are said to be _________.
Definition
heterozygous.
Term

The phenotypes that would result from the cross of H1H1 and H1H2 (H1 represents the normal gene for hemoglobin and H2 represents the incomplete dominant allele that causes the formation of abnormal hemoglobin) are:

 

A) all offspring would be normal 

B) 3/4 normal offspring and 1/4 with sickle cell trait

C) all offspring with sickle cell trait

D) none of these is correct

Definition
D) none of these is correct
Term
When the alleles of a gene pair are expressed differently but neither is dominant to the other, they are called ________.
Definition
incompletely dominant
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