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In a dihybrid cross, If you get $9: 3: 3: 1$ ratio it denotes that
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The alleles of two genes are segregating independently
The alleles of two genes are segregating independently
Alleles of two genes are segregeting independently. Mendel explained by crossing a pea plant with round and yellow seeds and one with wrinkled and green ones.
All $F_1$ hybrids give yellow and round seeds. Since yellow colour is dominant over the green and the round shape is dominant over the winkled.
When the $\mathrm{F}_1$-hybrid plants are crossed to each or allowed to self fertilise, and $\mathrm{F}_2$ - generation form as represented in the following figure
Phenotypic ratio $-9: 3: 3: 1$
The outcome of the dihybrid cross make it very clear that segregation of the seed colour is independent of the seed shape and both the parental and new combinations of the characters appear in the $\mathrm{F}_2$ offspring, i.e., assortment of genes of one pair is independnet of the other pair.
All $F_1$ hybrids give yellow and round seeds. Since yellow colour is dominant over the green and the round shape is dominant over the winkled.
When the $\mathrm{F}_1$-hybrid plants are crossed to each or allowed to self fertilise, and $\mathrm{F}_2$ - generation form as represented in the following figure
Phenotypic ratio $-9: 3: 3: 1$
The outcome of the dihybrid cross make it very clear that segregation of the seed colour is independent of the seed shape and both the parental and new combinations of the characters appear in the $\mathrm{F}_2$ offspring, i.e., assortment of genes of one pair is independnet of the other pair.
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