Question

In monohybrid cross proportion of 3 : 1 explains:​

Answer 1

Law of dominance states that in a pair of alleles one is a dominant character and other is a recessive character. Only the dominant character will show itself in the heterozygous trait. ... C) In the F2 generation of a monohybrid cross, the phenotypic ratio is 3: 1 where three plants are tall and one is a dwarf plant.

Answer 2

In monohybrid cross proportion 3:1 explains the phenotypic ratio.

• The 3:1 monohybrid phenotypic ratio was proposed by Gregor. J. Mendel, the father of genetics.
• He observed that when two homozygous plants were crossed, the resultant offspring was heterozygous.
• He termed this type of crossing, the monohybrid cross.
• He used pea pants for his study.
• When he crossed one tall pea plant and one dwarf pea plant, all the four offsprings were tall. He named them the F1 progeny.
• He observed that all the offspring exhibited the characteristics of only one parent and the other parent's train was absent in them.
• Then again he self-crossed the F1 progeny.
• 3 of the resultant offspring were tall and 1 was a dwarf and he named them the F2 progeny.
• Thus he concluded that the monohybrid cross's phenotypic ratio was 3:1.

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