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Punnet Square Practice
Test Description: Make a punnet square if needed
Instructions: Answer all questions to get your test result.
1) If two heterozygous individuals are mated, what percentage of their offspring will have the dominant phenotype?
A
100%
B
50%
C
10%
D
75%
2) Fluffy fur is a dominant trait in guinea pigs. Two fluffy guinea pigs have a non-fluffy offspring. What must be the genotypes of the parents?
A
ff and ff
B
Fg and FF
C
FF and FF
D
Ff and Ff
3) A heterozygous individual is mated with a homozygous recessive individual. What percentage of their children will be heterozygous?
A
50%
B
100%
C
10%
D
25%
4) The probability of a human couple having a male child is:
A
75%
B
100%
C
25%
D
50%
5) A normal woman with a colorblind father marries a normal man. What is the probability that her child (who will be a male), will be colorblind?
A
0%
B
75%
C
50%
D
100%
6) Hemophilia is a sex-linked trait. What is the probability of a diseased female and a normal male producing a healthy child?
A
0%
B
50%
C
100%
D
25%
7) Having more than 5 fingers (Polydactyly) is a dominant trait. What is the probability that two people, each of which have 5 fingers per limb,will have a 6-fingered child?
A
50%
B
100%
C
0%
D
75%
8) Cuteness is a dominant trait in bunnies. Two bunnies heterozygous for cuteness have numerous offspring. What percentage of the offspring would be predicted to not be cute?
A
50%
B
100%
C
75%
D
25%
9) The genotype of a carrier of a sex-linked disease would be:
A
X^X*
B
XY
C
X*X
D
xx
10) Purple flowers are dominant over white. What % will be white if two homozygous dominant parents are bred?
A
100%
B
25%
C
0%
D
50%
11) Round is dominant to square. What is the probability of the shape being round if a homozygous round father and a homozygous square mother have babies?
A
25%
B
0%
C
100%
D
75%
12) What would be the genotype of a person who has a sex-linked disease would be
A
X*Y
B
XX
C
X*X
D
XY
13) Whiskers in seals is dominant. What is the probability that 2 homozygous whiskered seals would have a baby without whiskers?
A
10%
B
100%
C
25%
D
0%
14) If brown is dominant over pink, what is the phenotypes of the offspring of 2 heterozygous brown bunnies?
A
100% brown
B
100% pink
C
25% brown 75% pink
D
75% brown, 25% pink
15) If brown is dominant to pink, what is the phenotype of the offspring of 1 homozygous brown bunny and 1 pink bunny?
A
50% of each
B
100% brown bunnies
C
0% brown
D
75% brown 25% pink
*select an answer for all questions
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