Question

Which of the following character has same result in reciprocal cross:

• A. Branch colour in Mirabilis
• B. Male sterility in maize
• C. Flower colour in snapdragon
• D. Eye colour in Drosophila

Answer 1

The correct option is C Flower colour in snapdragon

Most firmly established cases of true cytoplasmic inheritance are those that involve plastids, which are minute cytoplasmic organelles in plant cells. As obvious, usually plastids are transmitted through egg cytoplasm, and only very rarely few, if any plastids are transmitted through pollen. Consequently characters depending on plastids exhibit cytoplasmic inheritance sometimes independent of nuclear genes as in Mirabilis jalapa.

Cytoplasmic male sterility is total or partial male sterility in plants as the result of specific nuclear and mitochondrial interactions. Male sterility is the failure of plants to produce functional anthers, pollen, or male gametes.

Eye colour in Drosophila also show different results in reciprocal cross because the eye colour trait is a sex linked trait which varies according to the gender of the organism showing the trait. However, flower colour in Snapdragon is showing incomplete dominance which is not having a gender bias.

So the correct option is 'Flower colour in snapdragon'.