The genotypes of a plant variety were TtHh,Tthh,ttHh and tthh , where T = tallness and H = hairy stem. Which one of the following crosses would produce progeny giving a phenotypic ratio approximately 1:1:1:1 ?

Question

The genotypes of a plant variety were TtHh,Tthh,ttHh and tthh , where T = tallness and H = hairy stem. Which one of the following crosses would produce progeny giving a phenotypic ratio approximately 1:1:1:1 ? (A) TtHh× TtHh (B) TtHh× Tthh (C) TtHh× ttHh (D) TtHh× tthh

Tardigrade Admin · Accepted Answer

This is a dihybrid test cross between the heterozygous parental dominant type with the recessive trait that produces the ratio of

1 : 1 : 1 : 1.

Dihybrid cross is a cross between two different lines/genes that differ in two observed traits.

Q. The genotypes of a plant variety were $Tt H h, Tt hh, tt H h$ and $tt hh$ , where T = tallness and H = hairy stem. Which one of the following crosses would produce progeny giving a phenotypic ratio approximately $1 : 1 : 1 : 1$ ?

$Tt H h \times Tt H h$

$Tt H h \times Tt hh$

$Tt H h \times tt H h$

$Tt H h \times tt hh$

This is a dihybrid test cross between the heterozygous parental dominant type with the recessive trait that produces the ratio of $1 : 1 : 1 : 1.$
Dihybrid cross is a cross between two different lines/genes that differ in two observed traits.

Q. The genotypes of a plant variety were TtHh,Tthh,ttHh and tthh , where T = tallness and H = hairy stem. Which one of the following crosses would produce progeny giving a phenotypic ratio approximately 1:1:1:1 ?

TtHh×TtHh

TtHh×Tthh

TtHh×ttHh

TtHh×tthh