In which of the inheritance patterns, both phenotypic ratio and genotypic ratio of the F2 are identical?
In which of the inheritance patterns, both phenotypic ratio and genotypic ratio of the F2 are identical?
The correct option is A Incomplete dominace
Incomplete dominance is a phenomenon in which the alleles do not have a dominant - recessive relationship, thus the offspring will have characters other than parents. The expression of an F1 hybrid individual is an intermediate or a fine mixture of the expression of the two alleles.
Consider the flower colour in the snapdragon plant: Firstly, true-breeding red (RR) and white (rr) flowered snapdragon plants were crossed. The F1 generation produced a pink coloured flower. Then the F1 progeny was self-pollinated. This resulted in red (RR), pink (Rr) and white (rr) flowered plants in the ratio of 1:2:1.
Thus, we see that in the case of incomplete dominance the phenotypic and genotypic ratio are same.
The phenotypic and genotypic ratios of the Mendelian monohybrid cross are 3:1 and 1:2:1 respectively. For the Mendelian dihybrid cross, the phenotypic and genotypic ratios are 9:3:3:1 and 1:2:1:2:4:2:1:2:1 respectively.
Incomplete dominance is a phenomenon in which the alleles do not have a dominant - recessive relationship, thus the offspring will have characters other than parents. The expression of an F1 hybrid individual is an intermediate or a fine mixture of the expression of the two alleles.
Consider the flower colour in the snapdragon plant: Firstly, true-breeding red (RR) and white (rr) flowered snapdragon plants were crossed. The F1 generation produced a pink coloured flower. Then the F1 progeny was self-pollinated. This resulted in red (RR), pink (Rr) and white (rr) flowered plants in the ratio of 1:2:1.
Thus, we see that in the case of incomplete dominance the phenotypic and genotypic ratio are same.
The phenotypic and genotypic ratios of the Mendelian monohybrid cross are 3:1 and 1:2:1 respectively. For the Mendelian dihybrid cross, the phenotypic and genotypic ratios are 9:3:3:1 and 1:2:1:2:4:2:1:2:1 respectively.
