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Punnet Squares Practice - Level 2
Test Description: Practice your punnet squares skills!
Instructions: Answer all questions to get your test result.
1) In cats, long hair (L) is dominant over short hair (l). If a heterozygous, long haired cat is crossed with a homozygous, short haired cat, what is the probability of one of their offspring having long hair?
A
75%
B
25%
C
100%
D
50%
2) In cats, long hair (L) is dominant over short hair (l). If a homozygous, long haired cat is crossed with a homozygous, short haired cat, what is the probability of one of their offspring having short hair?
A
100%
B
50%
C
0%
D
25%
3) In cats, long hair (L) is dominant over short hair (l). If a heterozygous, long haired cat is crossed with a homozygous, long haired cat, what is the probability of one of their offspring having long hair?
A
75
B
50
C
25
D
100
4) One flower is heterozygous red (Rr) and it is crossed with a homozygous white (rr) plant. Use a Punnet square to determine the probability of one of their offspring having a white color.
A
25
B
100
C
50
D
75
5) In a certain species of plant, red flowers (R) are dominant to white flowers (r). You have crossed two red-flowered plants, but you don't know their genotypes. If you get 75% red offspring and 25% white offspring, the parents were...
A
Homozygous red (RR) and Homozygous red (RR)
B
Heterozygous red (Rr) and Heterozygous red (Rr)
C
Homozygous red (RR) and Heterozygous red (Rr)
D
White (rr) and Homozygous red (Rr)
6) In a certain species of plant, red flowers (R) are dominant to white flowers (r). You have crossed a red flowered plant and a white flowered plant. If you get 100% red offspring and 0% white offspring, the parents were...
A
rr and rr
B
RR and rr
C
RR and Rr
D
Rr and rr
7) In a certain species of pine trees, short needles (S) are dominant to long needles (s). If you cross a long-needled plant with a heterozygous short-needled plant, what will be the genotype ratios of your offspring?
A
75% short and 25% long
B
50% short and 50% long
C
0% short and 100% long
D
100% short and 0% long
8) In a certain species of pine trees, short needles (S) are dominant to long needles (s). If you cross a long-needled plant with a homozygous short-needled plant, what is the probability that your offspring will have long needles?
A
25%
B
100%
C
0%
D
50%
9) In guinea pigs, black fur (B) is dominant to white fur (b). If you cross two guinea pigs with heterozygous black fur, what is the probability of getting black offspring?
A
0
B
50
C
100
D
75
10) In guinea pigs, black fur (B) is dominant to white fur (b). If you cross two guinea pigs with homozygous white fur, what is the probability of getting black offspring?
A
100
B
75
C
0
D
50
*select an answer for all questions
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