Question

Heterozygous X Homozygous Recessive

Answer 1

Answer :

Heterozygous × homozygous recessive.

It is an example of test cross where an unknown individual with dominant trait is crossed with homozygous recessive individuals in order to known the genotype of unknown individual whether it has homozygous of heterozygous genotype.

Ex:- let P is a dominant allele and p is recessive allele.

Where PP represents homozygous dominant condition

And pp represents homozygous recessive condition

And Pp represents heterozygous condition with dominant phenotype.

Let cross :

P1:- Pp (heterozygous) X. pp (homozygous recessive)

F1:-

Gamete	P	p
P	PP	Pp
p	Pp	pp

Genotypic ratio: 1(PP):2(Pp):1(pp)

Phenotypic ratio : 3(dominant trait): 1(recessive trait).