Question

a man who is heterozygous for freckles and black hairs marries a women who is also heterozygous for freckles and Black hairs. show the possible phenotype and genotype of children​

Answer 1

Answer :-

Let the trait for black hair be B and freckles hair be b

Genes for man :- Bb

Genes for woman :- Bb

( punnett square in the attachment )

Phenotype :- The physical or external appearance of an organism, regardless of its genetic constitution.

Phenotypic ratio = 3 : 1

( Black hair : Freckles hair )

Genotype :- The genetic type constitution of an organism.

Genotypic ratio = 1 : 2 : 1

( Homozygous black : Heterozygous black : Homozygous freckles )

Additional information :-

Homozygous : A condition in which the two members of an allelic pair are similar in a diploid organism.

Heterozygous : A condition in which two members of an allelic pair are dissimilar.

Dominant characteristic : Any characteristic that appears in F₁ generation offspring from a cross between parents possessing contrasting characteristics such as tallness and dwarfness.

Recessive characteristic : Any characteristic present in the parental generation that does not appear in F₁ generation but reappears in the F₂ generation.

Answer 2

Answer :-

Let the trait for black hair be B and freckles hair be b

Genes for man :- Bb

Genes for woman :- Bb

( punnett square in the attachment )

Phenotype :- The physical or external appearance of an organism, regardless of its genetic constitution.

Phenotypic ratio = 3 : 1

( Black hair : Freckles hair )

Genotype :- The genetic type constitution of an organism.

Genotypic ratio = 1 : 2 : 1

( Homozygous black : Heterozygous black : Homozygous freckles )

Additional information :-

Homozygous : A condition in which the two members of an allelic pair are similar in a diploid organism.

Heterozygous : A condition in which two members of an allelic pair are dissimilar.

Dominant characteristic : Any characteristic that appears in F₁ generation offspring from a cross between parents possessing contrasting characteristics such as tallness and dwarfness.

Recessive characteristic : Any characteristic present in the parental generation that does not appear in F₁ generation but reappears in the F₂ generation.