by george.hoeger
Dive into the fascinating world of genetics with our Dihybrid Cross Quiz! This quiz will test your understanding of how two different traits are inherited simultaneously. Whether you’re a student brushing up on your biology or a science enthusiast, these questions will challenge and enhance your knowledge of Mendelian genetics. Test your skills and see how well you understand the principles of inheritance!
We recommend that you do not leave the page that you are taking this quiz in. Stay honest 🙂
Dihybrid Cross Quiz Questions Overview
1. What is a dihybrid cross?
A cross between two individuals that are heterozygous for one trait
A cross between two individuals that are heterozygous for two traits
A cross between two individuals that are homozygous for one trait
A cross between two individuals that are homozygous for two traits
2. Which of the following represents a dihybrid genotype?
AaBb
Aa
AABb
aaBB
3. What is the phenotypic ratio of a dihybrid cross in F2 generation?
3:1
9:3:3:1
1:2:1
1:1:1:1
4. Which of the following best describes the principle of independent assortment?
Genes for different traits can segregate independently during the formation of gametes.
Genes for the same trait always segregate together.
Genes are always inherited in pairs.
Only dominant genes are expressed.
5. In a dihybrid cross between two heterozygous individuals (AaBb x AaBb), what fraction of the offspring will be homozygous recessive for both traits?
1/16
1/4
3/16
9/16
6. If you cross AaBb with aabb, what proportion of the offspring will have the genotype AaBb?
1/4
1/2
1/8
3/4
7. Which of the following is an example of a test cross?
AaBb x AaBb
AaBb x aabb
AABB x aabb
AABB x AaBb
8. What is the expected phenotypic ratio of a test cross between AaBb and aabb?
1:1:1:1
9:3:3:1
3:1
1:2:1
9. How many different types of gametes can an individual with the genotype AaBb produce?
2
4
8
16
10. Which of the following represents a homozygous dominant genotype for both traits?
AABB
AaBb
aabb
AAbb
11. In a dihybrid cross, what is the probability of obtaining an offspring with the genotype AaBB?
1/16
1/8
1/4
3/16
12. Which of the following is NOT a possible phenotype in a dihybrid cross of AaBb x AaBb?
AB
Ab
aB
aa
13. What is the purpose of performing a dihybrid cross?
To determine the inheritance of a single trait
To determine the inheritance of two traits simultaneously
To determine the dominance of one trait
To determine the mutation rate
14. Which of the following represents a heterozygous genotype for both traits?
AaBb
AABB
aabb
AaBB
15. In a dihybrid cross, what is the probability of obtaining an offspring with the phenotype of both dominant traits?
1/16
3/16
9/16
12/16
16. What is the genotypic ratio of a dihybrid cross in the F2 generation?
1:2:1
9:3:3:1
1:1:1:1
1:2:1:2:4:2:1:2:1
17. Which of the following best describes the law of segregation?
Each pair of alleles segregates independently of other pairs during gamete formation.
Alleles segregate equally into gametes.
Alleles are inherited in pairs.
Only recessive alleles are segregated.
18. What is the probability of obtaining an offspring with the genotype Aabb from a dihybrid cross AaBb x AaBb?
1/16
1/8
1/4
3/16
19. In a dihybrid cross, what is the probability of obtaining an offspring with the genotype AaBb?
1/16
1/8
1/4
3/16
20. Which of the following represents a recessive phenotype for both traits?
AABB
AaBb
aabb
AAbb
21. What is the expected phenotypic ratio of a cross between AaBb and AaBB?
1:1:1:1
9:3:3:1
3:1
1:1
We recommend that you do not leave the page that you are taking this quiz in. Stay honest 🙂
