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miv72 [106K]
3 years ago
13

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
Biology
2 answers:
Art [367]3 years ago
5 0
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 hetero<span>zygote (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 </span><span>(pp)</span> with another phenotype and vice versa.
Sedbober [7]3 years ago
5 0

3:1 is correct, had this question earlier

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