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Which are related to incomplete dominanc...

Which are related to incomplete dominance in following :
(i) Flower colour in mirabilis jalapa
(ii) Coat colour in cattle
(iii) ABO blood group
(iv) Flower colour in snapdragon
(v) Coat colour in mice
(vi) Feather colour in andalusian fowls

A

i, ii and vi

B

i, iii and iv

C

i, iv and vi

D

ii, iii and v

Text Solution

AI Generated Solution

The correct Answer is:
To determine which examples are related to incomplete dominance, we will analyze each option given in the question: 1. **Flower color in Mirabilis jalapa**: - In Mirabilis jalapa, also known as the four o'clock plant, when red-flowered plants (RR) are crossed with white-flowered plants (rr), the resulting offspring (Rr) exhibit a pink flower color. This is a classic example of incomplete dominance because neither allele is completely dominant over the other, resulting in a blending of traits. - **Conclusion**: This is related to incomplete dominance. 2. **Coat color in cattle**: - In cattle, when black (BB) and white (bb) individuals are crossed, the offspring (Bb) display a coat with patches of both black and white. This phenomenon is known as co-dominance, where both alleles are expressed simultaneously without blending. - **Conclusion**: This is not related to incomplete dominance. 3. **ABO blood group**: - The ABO blood group system is another example of co-dominance. In this system, both A and B alleles are expressed in individuals with AB blood type, showing both traits distinctly rather than blending. - **Conclusion**: This is not related to incomplete dominance. 4. **Flower color in snapdragon**: - Similar to Mirabilis jalapa, in snapdragons, crossing red-flowered (RR) and white-flowered (rr) plants results in pink-flowered (Rr) offspring. This is another example of incomplete dominance, where the phenotypes blend. - **Conclusion**: This is related to incomplete dominance. 5. **Coat color in mice**: - In mice, the coat color can also exhibit co-dominance, where different color alleles can be expressed together, leading to a mixed phenotype rather than a blended one. - **Conclusion**: This is not related to incomplete dominance. 6. **Feather color in Andalusian fowls**: - In Andalusian fowls, crossing black (BB) and white (bb) birds results in blue (Bb) offspring, which is a blending of the two colors. This is an example of incomplete dominance. - **Conclusion**: This is related to incomplete dominance. **Final Summary**: The examples related to incomplete dominance are: - (i) Flower color in Mirabilis jalapa - (iv) Flower color in snapdragon - (vi) Feather color in Andalusian fowls
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