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Question
In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that ______.
Options
The allels of two genes are segregating independently
It is a case of multiple allelism
It is a multigenic inheritance
The allels of two genes are interacting with each other
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Solution
In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that the allels of two genes are segregating independently.
Explanation:
The 9:3:3:1 ratio observed in a dihybrid cross denotes that the alleles of two different genes are assorting independently of each other during gamete formation. This classic Mendelian dihybrid ratio demonstrates the law of independent assortment, which states that gene pairs located on different chromosomes segregate independently during meiosis, resulting in this phenotypic ratio in the F2 generation. Thus, each trait is inherited independently, producing four distinct phenotype classes in the ratio of 9 (both dominant traits) : 3 (dominant first, recessive second) : 3 (recessive first, dominant second) : 1 (both recessive).
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RELATED QUESTIONS
Filling the blank based on the given relationship.
3 : 1 Monohybrid : : 9 : 3 : 3 : 1 : ______
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Reason: Higher parental gene combinations can be attributed to crossing over between two genes.
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When F1 plants were self-pollinated, a total of 800 plants were produced. How many of these would be tall, medium height or short plants? Give the genotype of F2 generation.
Which of the following statement is not correct for two genes that show 50% recombination frequency?
