Question

Can someone help me please ?

Answer 1

Based on freckles being recessive,

First cross:

• The genotypic ratio is 1; all heterozygous normal
• The phenotypic ratio is 1; all normal

Second cross:

• The genotypic ratio is 2:2; two heterozygotes, 2 h0m0zygous recessive
• The phenotypic ratio is 2:2; two normal, 2 freckles

Third cross:

• The genotypic ratio is 2:2; two h0m0zygous normal, two heterozygous normal
• The phenotypic ratio is 1; all normal

What are genotype and phenotypes?

Genotype refers to the genetic makeup of an organism.

Phenotype refers to the phusical expression of a trait in an organism due to the genes and the environment.

Given that freckles are recessive:

1. FF x ff = Ff, Ff, Ff, Ff

• The genotypic ratio is 1; all heterozygous normal
• The phenotypic ratio is 1; all normal

2. Ff × ff = Ff, Ff, ff, ff

• The genotypic ratio is 2:2; two heterozygotes, 2 h0m0zygous recessive
• The phenotypic ratio is 2:2; two normal, 2 freckles

3. FF × Ff = FF, FF, Ff, Ff

• The genotypic ratio is 2:2; two h0m0zygous normal, two heterozygous normal
• The phenotypic ratio is 1; all normal

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