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Q.

Which of the following can be expected if scientists succeed in introducing apomictic gene into hybrid varieties of crops? 

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a

Polyembryony will be seen and each seed will produce many plantlets. 

b

Seeds of hybrid plants will show longer dormancy. 

c

Farmers can keep on using the seeds produced by the hybrids to raise new crop year after year.  

d

There will be segregation of the desired characters only in the progeny.
 

answer is C.

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Detailed Solution

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Farmers can keep on using the seeds produced by the hybrids to raise new crops year after year because with apomictic seeds, the genetic uniformity of the hybrid plants is maintained across generations.This is because apomictic seeds are produced without sexual reproduction, so there is no genetic recombination or segregation of traits. As a result, the plants grown from these seeds will be true to the original hybrid and display the same desired traits, allowing farmers to use the seeds produced by the hybrids repeatedly for subsequent crops with consistent characteristics.

(1) Polyembryony refers to the development of multiple embryos within a single seed. While apomixis can lead to polyembryony, it is not a direct consequence of introducing an apomictic gene into hybrid varieties of crops.

(2) The presence of an apomictic gene is not directly related to the dormancy of seeds. Seed dormancy can be
Influenced by various factors but it is not a specific outcome of introducing apomictic genes.

(4) Apomixis leads to a lack of segregation of traits in the progeny because the seeds are genetically identical to the parent plant. Therefore, there will not be segregation of desired characters in the progeny when apomictic genes are introduced.  

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