The second generation phenotypes resulting from the cross of purebred monohybrid pollination will display a ratio of _____. 2:2 4:1 3:1 none of the above

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Auzzy Auzzy

31-03-2016
Biology

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The second generation phenotypes resulting from the cross of purebred monohybrid pollination will display a ratio of _____. 2:2 4:1 3:1 none of the above

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JcAlmighty JcAlmighty · Answer 1 · 2016-04-08T07:30:36-04:00

The answer is 3:1.

If we imagine that plant has two alleles for the
trait, we can dominant allele represent with P represents and recessive allele with p. To get purebred monohybrid in the first generation, parents must be a dominant homozygote (PP) and a recessive heterozygote (pp):

Parental generation: PP x pp
The first generation: Pp Pp Pp Pp

Pp represents a heterozygote.
If we cross these heterozygotes:

The first generation: Pp x Pp
The second generation: PP Pp Pp pp

If dominant allele determines the phenotype, there will be 3 plants (one PP and two Pp) with one phenotype and only 1 plant (pp) with another phenotype and vice versa.

ebond ebond · Answer 2 · 2018-10-16T14:14:33-04:00

ebond ebond

16-10-2018

3:1 is correct, had this question earlier

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