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A & P 2 ch 29

front 1

The appearance of freckles is considered:
a the genome.
b the phenotype.
c the genotype.
d sex linked.

back 1

B. the phenotype

front 2

In females, one of the X chromosomes is inactivated by:
a environmental factors.
b enzymes coded for by mitochondrial DNA.
c epigenetic markers.
d the number of dominant genes present on each X chromosome

back 2

C. epigenetic markers

front 3

Males tend to inherit more sex-linked conditions because:
a. they have two Y chromosomes.
b. there is no corresponding alleles on their X chromosomes.
c. they have more chromosomes than females.
d. there is no corresponding allele on their Y chromosomes.
e. they have two X chromosomes.

back 3

D. there is no corresponding allele on their Y chromosomes.

front 4

A change in the genetic structure of a gene is called:
a mutation.
b deletion.
c duplication.
d translocation.
e inversion.

back 4

A. mutation

front 5

Extrachromosomal inheritance involves genes passed on by the mother's:
a mitochondria.
b Golgi bodies.
c smooth ER.
d chromosomes.
e cytoplasm.

back 5

A. mitochondria

front 6

The most common form of fetal testing is:
a somatic visualization.
b chorionic villi sampling.
c teratogenic sampling.
d gene therapy.
e amniocentesis.

back 6

E. amniocentesis

front 7

The expression of genes is called the:
a genotype.
b autotype.
c phenotype.
d pedigree.
e genome.

back 7

C. phenotype

front 8

Traits that display continuous phenotypic variation are usually determined by this form of inheritance.
a Dominant-recessive inheritance
b Incomplete dominance
c Sex-linked inheritance
d Polygenic inheritance
e Multiple-allele inheritance

back 8

D. polygenic inheritance

front 9

What is the probability of having a child with a recessive trait if both parents are heterozygous for the trait?
a 50%
b 25%
c 100%
d 10%
e 75%

back 9

b. 25%

front 10

Heterozygous individuals that can pass on recessive, abnormal conditions are referred to as:
a zygotic.
b phenotypically challenged.
c deleterious donators.
d carriers.
e recessively compromised.

back 10

d. carriers

front 11

A type of treatment useful in correcting single-gene disorders is:
a genetic dysplasia.
b somatic recombination.
c gene therapy.
d amniocentesis.
e chorionic villi sampling.

back 11

c. gene therapy

front 12

Genes that are located on the same chromosome are said to be:
a dominant.
b crossed.
c linked.
d syncopated.
e tied.

back 12

C. linked

front 13

In the human blood type AB, the alleles are:
a codominant.
b dominant.
c sex-linked.
d polygenic.

back 13

a.codominant

front 14

Which of the following disorders is NOT inherited as simple recessive traits?
a Cystic fibrosis
b Albinism
c Tay-Sachs disease
d Down syndrome
e Schizophrenia

back 14

d. down syndrome

front 15

Which of the following is NOT a source of genetic variation?
A) independent assortment of chromosomes
B) crossover of homologs
C) age of either or both parents
D) random fertilization of eggs by sperm

back 15

C

front 16

True or False

Hemophilia is an X-linked condition caused by a recessive gene.

back 16

T

front 17

True or False

Most genetic disorders are inherited through dominant genes.

back 17

False

front 18

The gene responsible for the condition known as sickle-cell anemia demonstrates ___.

back 18

incomplete dominance

front 19

True or False

When two genes are on the same chromosome, they are considered linked.

back 19

True

front 20

Some segments of the Y chromosome have no counterpart on the X chromosome. T/F

back 20

True