GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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50% red, 50% speckled
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50% red, 50% blue
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50% blue, 50% speckled
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None of the above
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Detailed explanation-1: -This pattern of inheritance is described as incomplete dominance, meaning that neither of the alleles is completely dominant over the other: both alleles can be seen at the same time. The allele for red flowers is incompletely dominant over the allele for white flowers. Red + white = pink.
Detailed explanation-2: -In codominance, both alleles are expressed together in the offspring. If we cross a red flower and white flower that have a codominance inheritance pattern, the offspring would be flowers with red and white patches on them.
Detailed explanation-3: -The cross can be shown as in the image. This is called incomplete dominance. Due to this reason, the F2 phenotypic ratio and genotypic ratios are same in a cross between red-flowered and white flowered snapdragon plants.
Detailed explanation-4: -The phenotypic ratio in the F2 generation differs from the original ratio due to this incomplete inheritance pattern. This can be explained through a Punnett square. The phenotypic ratio in this is similar to the genotypic ratio i.e, 1:2:1.