Question

Which of the following represents a testcross?

Select one:

a. Ww x WW

b. ww x WW

c. Ww x Ww

d. WW x WW

e. none of the above

Answer 1

• Test vross os performed to test genotybe of the trait as homozygous or heterozygous.
• The test cross is performed between dominant F1 hybrid (homozygous dominant or heterozygous dominant) with recessive parent

• If the genotyp is homozyous, all the offsbring will be heterozygous dominant.
• If the genotybe is heterozygous, the genotybe will be 1 homozygous dominant and 2 heterozygous dominant and 1 recessive, out of 4 offsbring.

Representation:

• C= dominant
• c= recessive

CC x cc

	C	C
c	Cc	Cc
c	Cc	Cc

Cc x cc

	C	c
C	CC	Cc
c	Cc	cc

Answer: b