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  • What are the genetic mechanisms that regulate self-incompatibility in plants?Option: 1 Gametophytic and sporophytic &nb

What are the genetic mechanisms that regulate self-incompatibility in plants?

Option: 1

Gametophytic and sporophytic

 


Option: 2

Heterozygotic and homozygotic


Option: 3

Dominant and recessive

 


Option: 4

Polygenic and monogenic


Answers (1)

best_answer

Self-incompatibility in plants is regulated by two main genetic mechanisms: gametophytic and sporophytic.

Gametophytic self-incompatibility involves the interaction between the pollen and the stigma. The S-allele gene is expressed in the pollen, and the S-receptor gene is expressed in the stigma. If the pollen and stigma express the same S-allele, the pollen will not be able to fertilize the ovules.

In sporophytic self-incompatibility, the interaction occurs between the pollen and the maternal tissues of the plant. The S-allele gene is expressed in the sporophyte, and the S-receptor gene is expressed in the stigma. If the pollen and sporophyte express the same S-allele, the pollen will not be able to fertilize the ovules.

Overall, these mechanisms ensure that plants cannot self-fertilize, promoting genetic diversity within the species. Hence, option 1 is the correct answer. 

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Rishi

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