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Dihybrid Cross, Punnett Square Video Lecture - NEET

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FAQs on Dihybrid Cross, Punnett Square Video Lecture - NEET

1. What is a dihybrid cross and how is it related to Punnett squares?
A dihybrid cross is a genetic cross between two individuals that differ in two traits. It involves the study of inheritance patterns for two different genes at the same time. Punnett squares are used to predict the outcomes of a dihybrid cross by visually representing the possible combinations of alleles from the parent organisms.
2. How do you set up a Punnett square for a dihybrid cross?
To set up a Punnett square for a dihybrid cross, you create a grid with four boxes. Label the top row and left column with the possible alleles for one trait, and the second row and right column with the possible alleles for the other trait. Then, combine the alleles from the parent organisms in each box to determine the possible genotypes and phenotypes of the offspring.
3. What does it mean when a Punnett square shows a ratio of 9:3:3:1?
A ratio of 9:3:3:1 in a Punnett square indicates the expected phenotypic ratio of the offspring resulting from a dihybrid cross. It means that there is a 9/16 chance of obtaining individuals that show both dominant traits, a 3/16 chance of individuals showing one dominant and one recessive trait, another 3/16 chance of individuals showing the other dominant and recessive trait, and a 1/16 chance of individuals showing both recessive traits.
4. How can Punnett squares help determine the probability of certain traits in offspring?
Punnett squares provide a visual representation of possible allele combinations and their probabilities in offspring. By using Punnett squares, you can determine the probability of certain traits in offspring by identifying the different genotypes resulting from the cross and their corresponding phenotypes. This can give you a better understanding of the likelihood of specific traits being expressed in the next generation.
5. Can Punnett squares be used for more than two traits in a cross?
Yes, Punnett squares can be extended to include more than two traits in a cross, known as a multihybrid cross. However, as the number of traits increases, the complexity of generating and interpreting the Punnett square also increases. It requires more rows and columns in the grid to represent all the possible allele combinations, making it more challenging to predict the outcomes accurately.
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