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Conducting a monohybrid cross of F1 generation plants, the
recessive trait reappears in F2 plants in a ratio of 3.1.

 

A monohybrid is a hybrid that is heterozygous with respect to
a specified gene.

 

The correct answer between all
the choices given is the third choice or letter C. I am hoping that this answer
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Answer: The correct answer for the blank is-

C. 3:1

Monohybrid cross is a genetic cross between two organisms, which are having pure homozygous genotype for one contrasting character/ trait ( such as between tall and dwarf height of pea plant).

This means that parents are pure breeding (TT and tt for tall and dwarf respectively) for a contrasting trait.

Parents - TT and tt  will produce all offspring with the genotype Tt ( tall, as T is a dominant allele that depicts tall plant height and masks the dwarf plant height when present with t allele, which is for dwarf height).

When plants of F1 generation ( that is Tt and Tt) are crossed, they will produce offspring in the ration 3: 1 ( tall: dwarf) in F2 generation.

Refer punnet square.

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