by Becky Allard
Dive into the fascinating world of genetics with our Dihybrid Cross Quiz! This quiz will take you through the intricacies of Mendelian inheritance, focusing on how two different traits are passed down from parents to offspring. Whether you’re a student brushing up on your biology or a genetics enthusiast, this quiz is designed to test and expand your understanding of dihybrid crosses. Get ready to challenge your knowledge and have fun learning!
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 organisms with different traits
A cross between two organisms with two different traits
A cross between two organisms with identical traits
A cross between two organisms with one trait
2. Which scientist is credited with the discovery of the principles of inheritance that include dihybrid crosses?
Charles Darwin
Gregor Mendel
James Watson
Francis Crick
3. In a dihybrid cross, what is the expected phenotypic ratio in the F2 generation?
9:3:3:1
3:1
1:2:1
1:1
4. What is the purpose of a Punnett square in a dihybrid cross?
To predict the genotypes of offspring
To determine the sex of offspring
To calculate mutation rates
To measure genetic diversity
5. Which of the following represents a genotype for a dihybrid cross?
AaBb
AB
AABB
Aa
6. If a plant with genotype AaBb is crossed with another plant with genotype AaBb, how many different genotypes are possible in the offspring?
4
9
16
8
7. In a dihybrid cross, what does the term ‘independent assortment’ refer to?
Genes for different traits are inherited together
Genes for different traits are inherited independently
Genes for the same trait are inherited together
Genes for the same trait are inherited independently
8. Which of the following best describes the law of segregation?
Each pair of alleles segregates independently during gamete formation
Alleles do not segregate during gamete formation
Each pair of alleles segregates together during gamete formation
Alleles segregate randomly during gamete formation
9. What is the genotype of a homozygous dominant individual for two traits?
AABB
AaBb
aabb
AaBB
10. In a dihybrid cross, if both parents are heterozygous for both traits, what fraction of the offspring will be homozygous recessive for both traits?
1/16
1/4
3/16
9/16
11. What is the phenotypic ratio of a dihybrid cross between two heterozygous individuals?
9:3:3:1
3:1
1:2:1
1:1
12. Which of the following is an example of a dihybrid cross?
AaBb x AaBb
Aa x Aa
AaBb x AABB
AABB x aabb
13. What is the probability of obtaining an offspring with the genotype AABB from a dihybrid cross AaBb x AaBb?
1/16
1/4
3/16
9/16
14. In a dihybrid cross, what does the term ‘recessive’ mean?
The trait that is expressed
The trait that is masked by the dominant trait
The trait that is always expressed
The trait that is inherited from the father
15. Which of the following is an example of a phenotype?
AaBb
Tall and yellow
AABB
aabb
16. What does a 9:3:3:1 ratio in a dihybrid cross indicate?
The traits are linked
The traits assort independently
There is incomplete dominance
There is codominance
17. What is the significance of Mendel’s law of independent assortment in dihybrid crosses?
It explains why traits are inherited together
It explains why traits are inherited independently
It explains why some traits are dominant
It explains why some traits are recessive
18. Which of the following best describes a test cross?
Crossing an individual with a dominant phenotype with a homozygous recessive individual
Crossing two homozygous dominant individuals
Crossing two homozygous recessive individuals
Crossing an individual with a recessive phenotype with a homozygous dominant individual
19. In a dihybrid cross, what does it mean if two genes are linked?
The genes are located on the same chromosome and tend to be inherited together
The genes are located on different chromosomes and assort independently
The genes are always dominant
The genes are always recessive
20. What is the purpose of using a Punnett square in a dihybrid cross?
To predict the genotypic and phenotypic ratios of offspring
To determine the sex of offspring
To calculate mutation rates
To measure genetic diversity
21. In a dihybrid cross, what does a 9:3:3:1 phenotypic ratio suggest about the genes involved?
The genes assort independently
The genes are linked
There is incomplete dominance
There is codominance
We recommend that you do not leave the page that you are taking this quiz in. Stay honest 🙂
