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Question
In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:
In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:
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Solution
The correct option is C The alleles of two genes are segregating independently
Dihybrid cross:
A cross involving two pairs of contrasting characters is called a dihybrid cross. For example, a plant with yellow and round seed (YYRR) crossed with a plant with green and wrinkled seeds (yyrr). The phenotypic ratio of second filial generation obtained in this case is 9:3:3:1 on selfing of the first filial generation
Law of independent assortment:
Law of independent assortment states that when two pairs of traits (two characters) are combined in a hybrid, segregation of one character is independent of the other character.
9:3:3:1 ratio in dihybrid cross:
The alleles for different traits are present in different homologous chromosomes in the organism. Hence, they segregate independently during the formation of gametes and recombine randomly during fertilisation. It results in the production of progeny with variable traits in a dihybrid cross.
Hence, a dihybrid cross yields a phenotypic ratio of 9:3:3:1 in the second filial generation on selfing of the first filial generation. This shows the presence of parental combination of traits(9 and 1) and recombinants (3 and 3).
Final answer :
d.) The alleles of two genes are segregating independently.
Dihybrid cross:
A cross involving two pairs of contrasting characters is called a dihybrid cross. For example, a plant with yellow and round seed (YYRR) crossed with a plant with green and wrinkled seeds (yyrr). The phenotypic ratio of second filial generation obtained in this case is 9:3:3:1 on selfing of the first filial generation
Law of independent assortment:
Law of independent assortment states that when two pairs of traits (two characters) are combined in a hybrid, segregation of one character is independent of the other character.
9:3:3:1 ratio in dihybrid cross:
The alleles for different traits are present in different homologous chromosomes in the organism. Hence, they segregate independently during the formation of gametes and recombine randomly during fertilisation. It results in the production of progeny with variable traits in a dihybrid cross.
Hence, a dihybrid cross yields a phenotypic ratio of 9:3:3:1 in the second filial generation on selfing of the first filial generation. This shows the presence of parental combination of traits(9 and 1) and recombinants (3 and 3).
Final answer :
d.) The alleles of two genes are segregating independently.
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