61) Sperm carry A) only one X sex chromosome, exclusively. B) only : 1200428

61) Sperm carry
A) only one X sex chromosome, exclusively.
B) only : 1200428.


61) Sperm carry

A) only one X sex chromosome, exclusively.

B) only one Y sex chromosome, exclusively.

C) no sex chromosomes.

D) two Y sex chromosomes.

E) one X or one Y sex chromosome.

62) The normal pair of sex chromosomes in males is

A) XX.

B) XO.

C) YO.

D) XY.

E) YY.

63) The purpose of the Human Genome Project (HGP) is to

A) identify alleles for research.

B) transcribe the full set of genetic material in human chromosomes.

C) discover new methods for fingerprinting.

D) create a “master race.”

E) study human development.

64) Which of the following phenotypic characteristics is an example of “codominance”?

A) normal skin pigmentation

B) curly hair

C) presence of Rh factor on red blood cell membranes

D) presence of A or B antigens on red blood cell membranes

E) ability to taste phenylthiocarbamate (PTC)

65) The portion of DNA that codes for a particular polypeptide is called a(n) ________.

A) genome

B) phenotype

C) karyotype

D) trait

E) gene

66) Human somatic cells contain ________ chromosomes.

A) 24, or 12 pairs of

B) 46, or 23 pairs of

C) 92, or 46 pairs of

D) 12, or 6 pairs of

E) 16, or 8 pairs of

67) Which of the following is a recessive trait?

A) curly hair

B) color blindness

C) eye color

D) hemoglobin molecular structure

E) straight hair

68) Which of the following is an autosomal dominant inherited disorder?

A) Huntington’s disease

B) sickle cell anemia

C) Duchenne muscular dystrophy

D) color blindness

E) deafness

69) A(n) ________ allele will always be expressed regardless of what the other allele happens to be.

A) heterozygous

B) sex-linked

C) recessive

D) dominant

E) autosomal

70) The human genome consists of approximately 3.2 billion base pairs. Protein-coding genes represent ________ of the total genome.

A) 25

B) 10

C) 2

D) 50

E) 99



61) Sperm carry
A) only one X sex chromosome, exclusively.
B) only : 1200428

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