More Genetics: Question Preview (ID: 157)

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An example of a single gene trait with two alleles would be
a) round pea seeds versus wrinkled
b) blood type
c) height in humans
d) skin color in humans

The phenotypes for human blood type are
a) A, B, and C
b) A, B, and O
c) A, B, AB, and O
d) A, AO, B, BO, AB, OO

How many pairs of chromosomes do humans have?
a) 46
b) 24
c) 23
d) 22

If a human is a girl, her sex chromosomes are
a) XX
b) XY

Sex-linked genes are genes found on the X and Y chromosomes. Which of the following is a sex-linked trait?
a) Widow's peak
b) hemophilia
c) cystic fibrosis
d) Down syndrome

Sickle-cell disease affects hemoglobin, a protein in red blood cells that carries oxygen. Which of the following statements are true?
a) Sickle-cell disease is a sex-linked disorder.
b) Sickle-cell is a disease that does not affect young people.
c) The allele for the sickle-cell trait is codominant with the normal allele.
d) People heterozygous for the disease shown fullblown symptoms of the disease.

In Down syndrome, a person's cells have an extra copy of chromosome
a) 21.
b) 22.
c) 23.
d) 11.

A _______________ is a chart or "family tree" that tracks which members of a family have a particular trait.
a) Punnett square
b) karyotype
c) pedigree
d) chromosome analysis

The end result of cloning is an organism that has mostly the same genes as the organism from which it was produced.
a) True
b) False

Gene therapy may someday help correct genetic disorders by inserting copies of the defective gene directly into a person's cells.
a) True
b) False

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