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Question
What would be the colour of flower in F1 progeny as a result of cross between homozygous red and homozygous white flowered Snapdragon?
What would be the colour of flower in F1 progeny as a result of cross between homozygous red and homozygous white flowered Snapdragon?
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Solution
The correct option is A Pink
Snapdragon plant shows incomplete dominance of flower colour. It means that one allele for the flower colour is not completely dominant over the other one and thus the heterogenous genotype shows a combination of dominant and recessive phenotypes. A cross between white flowered (rr) and red flowered plant (RR) gives all plants with pink colored flowers (Rr). Option D is correct answer. If the red colour was completely dominant over white colour; the F1 hybrid would show red flowers which makes option A wrong. If the red and white colour were codominant, none of them was dominant, the F1 hybrid would show red and white flowers; option C is wrong. White colour is recessive which is not expressed in a hybrid; option B is wrong.
Snapdragon plant shows incomplete dominance of flower colour. It means that one allele for the flower colour is not completely dominant over the other one and thus the heterogenous genotype shows a combination of dominant and recessive phenotypes. A cross between white flowered (rr) and red flowered plant (RR) gives all plants with pink colored flowers (Rr). Option D is correct answer. If the red colour was completely dominant over white colour; the F1 hybrid would show red flowers which makes option A wrong. If the red and white colour were codominant, none of them was dominant, the F1 hybrid would show red and white flowers; option C is wrong. White colour is recessive which is not expressed in a hybrid; option B is wrong.
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