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Genetics 2 Review
Test Description: Genetics test review
Instructions: Answer all questions to get your test result.
1) A married couple both have normal color vision, but their son has red-green colorblindness, a X-linked recessive trait. How is this possible?
A
His brother could be a carrier.
B
His father could be a carrier.
C
His mother could be a carrier.
D
His grandmother could be a carrier.
2) In a cross between a white-eyed female fruit fly and pure red-eyed male, what percent of the male offspring will have white eyes? (White eyes are X-linked and are recessive.)
A
50%
B
25%
C
75%
D
100%
3) What symbol on a pedigree chart would show a female that is colorblind?
A
empty shaded circle
B
empty circle
C
half shaded circle
D
full shaded circle
4) A test is done on a developing fetus (baby). The fetus has two X chromosomes. Which of the following is definitely true?
A
The baby will be happy.
B
The baby will have blond hair.
C
The baby will be a girl.
D
The baby will be a colorblind boy.
5) What shows the possible genetic combinations from the parent to the offspring?
A
A pedigree square
B
A Punnett sqare
C
In a pedigree, boys are represented using squares.
D
In a pedigree, girls are represented using circles.
6) A woman is heterozygous dominant for brown eyes. Will any of her children have blue eyes?
A
yes
B
no
C
maybe, depends on the father
7) Sometimes a blending of traits occurs. When a white flower is crossed with a red flower, the resulting flower is pink. This is an example of ?
A
selective breeding
B
incomplete dominance
C
cloning
D
genetic engineering
8) A special kind of cell division in which gametes are formed is called
A
long division
B
mitosis
C
replication
D
meiosis
9) Who would be an example of a boilogical son?
A
a step-son from a previous marriage
B
a boy who was adopted
C
a boy whose mom gave birth to him in the hospital
D
a kid we picked up at the pool
10) How many pairs of chromosomes do boys have?
A
46
B
22
C
21
D
23
*select an answer for all questions
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