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More Genetics
Test Description: More review questions for genetics (a little tougher)
Instructions: Answer all questions to get your test result.
1) An example of a single gene trait with two alleles would be
A
skin color in humans
B
round pea seeds versus wrinkled
C
height in humans
D
blood type
2) The phenotypes for human blood type are
A
A, AO, B, BO, AB, OO
B
A, B, and O
C
A, B, AB, and O
D
A, B, and C
3) How many pairs of chromosomes do humans have?
A
22
B
24
C
46
D
23
4) If a human is a girl, her sex chromosomes are
A
XY
B
XX
5) Sex-linked genes are genes found on the X and Y chromosomes. Which of the following is a sex-linked trait?
A
Down syndrome
B
hemophilia
C
Widow's peak
D
cystic fibrosis
6) Sickle-cell disease affects hemoglobin, a protein in red blood cells that carries oxygen. Which of the following statements are true?
A
Sickle-cell is a disease that does not affect young people.
B
The allele for the sickle-cell trait is codominant with the normal allele.
C
People heterozygous for the disease shown fullblown symptoms of the disease.
D
Sickle-cell disease is a sex-linked disorder.
7) In Down syndrome, a person's cells have an extra copy of chromosome
A
22.
B
11.
C
23.
D
21.
8) A _______________ is a chart or "family tree" that tracks which members of a family have a particular trait.
A
pedigree
B
karyotype
C
chromosome analysis
D
Punnett square
9) 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
10) Gene therapy may someday help correct genetic disorders by inserting copies of the defective gene directly into a person's cells.
A
False
B
True
*select an answer for all questions
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