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Inheritance of two Genes:Dihybrid Cross Video Lecture - NEET
FAQs on Inheritance of two Genes:Dihybrid Cross Video Lecture - NEET
| 1. What is a dihybrid cross? |  |
A dihybrid cross is a genetic cross between two individuals that differ in two traits, which are controlled by two different genes. This type of cross helps to determine the inheritance patterns of these two genes and the possible combinations of traits in the offspring.
| 2. How is the inheritance of two genes determined in a dihybrid cross? | |
In a dihybrid cross, the inheritance of two genes is determined by the principles of Mendelian genetics. Each gene can have two different alleles, one from each parent. These alleles segregate independently during gamete formation, and then randomly combine during fertilization. This results in four possible combinations of alleles in the offspring, known as the phenotypic ratio of 9:3:3:1.
| 3. What is the purpose of conducting a dihybrid cross? | |
The purpose of conducting a dihybrid cross is to study the inheritance patterns of two genes simultaneously. It allows researchers to understand how different traits are inherited together and determine the probability of certain combinations occurring in the offspring. This information is crucial in fields such as agriculture and medicine for selective breeding and predicting the likelihood of certain genetic disorders.
| 4. How do you calculate the phenotypic ratio in a dihybrid cross? | |
To calculate the phenotypic ratio in a dihybrid cross, you need to determine the possible combinations of alleles that can occur in the offspring. For example, if the two genes being studied are AaBb and AaBb, there are four possible combinations of alleles: AB, Ab, aB, and ab. The phenotypic ratio is then calculated by counting the number of each combination and expressing it as a ratio. In this case, the phenotypic ratio would be 9:3:3:1.
| 5. How does a dihybrid cross differ from a monohybrid cross? | |
A dihybrid cross differs from a monohybrid cross in that it involves the inheritance of two different genes, whereas a monohybrid cross involves the inheritance of only one gene. In a dihybrid cross, there are four possible combinations of alleles in the offspring, resulting in a phenotypic ratio of 9:3:3:1. In contrast, a monohybrid cross only has two possible combinations of alleles, resulting in a phenotypic ratio of 3:1.
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