biology : class12 Dihybrid Gametes : Dihybrid Cross, Independent Assortment : Law of Independent Assortment MCQ Questions and Answers
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Dihybrid Gametes
MCQ questions and answers.
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MCQ Questions
1. How many different types of gametes can an individual with genotype AaBb produce?
A.
1
B.
2
C.
4
D.
8
Correct Answer:
4
Explanation:
The genotype AaBb has two heterozygous gene pairs. By independent assortment, it produces 2 × 2 = 4 types of gametes.
2. Which set correctly represents the gametes produced by an AaBb individual?
A.
AB, Ab, aB, ab
B.
AA, BB, aa, bb
C.
AB, AB, ab, ab
D.
Aa, Bb, AB, ab
Correct Answer:
AB, Ab, aB, ab
Explanation:
An AaBb individual contributes one allele from each gene pair to a gamete, producing AB, Ab, aB, and ab.
3. What is the probability that an AaBb individual produces an AB gamete?
A.
1/2
B.
1/4
C.
3/4
D.
1
Correct Answer:
1/4
Explanation:
The probability of receiving A is 1/2 and the probability of receiving B is 1/2. Therefore, the probability of an AB gamete is 1/2 × 1/2 = 1/4.
4. Which gamete can be produced by an individual with genotype AaBb?
A.
AA
B.
Bb
C.
aB
D.
Aa
Correct Answer:
aB
Explanation:
A gamete contains one allele from each gene. The combination aB contains one allele from the A gene and one from the B gene.
5. An individual has genotype AABb. Which pair of gametes can it produce?
A.
AB and Ab
B.
AB and aB
C.
Ab and ab
D.
AA and Bb
Correct Answer:
AB and Ab
Explanation:
The individual always contributes A because it is AA, while it can contribute either B or b because it is Bb. Thus, its gametes are AB and Ab.
6. How many different gamete types are produced by an individual with genotype AaBB?
A.
1
B.
2
C.
3
D.
4
Correct Answer:
2
Explanation:
The individual can contribute A or a, but it can contribute only B because it is BB. Therefore, the gametes are AB and aB.
7. Which gamete is not produced by an individual with genotype AaBb?
A.
AB
B.
Ab
C.
aB
D.
AA
Correct Answer:
AA
Explanation:
A gamete from AaBb contains one allele from each gene pair. AA contains two alleles of the same gene and is not a valid gamete from this genotype.
8. If the genotype of a plant is Aabb, which gamete types can it form?
A.
AB and Ab
B.
Ab and ab
C.
aB and ab
D.
AB and aB
Correct Answer:
Ab and ab
Explanation:
The plant always contributes b because it is bb, while it can contribute A or a. Therefore, it forms Ab and ab gametes.
9. In a dihybrid genotype AaBb, which allele combination results when the gamete receives a from the first gene pair and B from the second gene pair?
A.
AB
B.
Ab
C.
aB
D.
ab
Correct Answer:
aB
Explanation:
The gamete receives a from the A gene pair and B from the B gene pair, so the resulting gamete is aB.
10. What is the expected ratio of AB, Ab, aB, and ab gametes from an AaBb individual?
A.
1:1:1:1
B.
3:1:1:3
C.
1:2:2:1
D.
2:1:1:2
Correct Answer:
1:1:1:1
Explanation:
Because the two gene pairs assort independently, each of the four gamete types is produced with equal probability, giving a 1:1:1:1 ratio.
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