First slide

Inheritance of One Gene

Question

When a tall pea plant of heterozygous genotype is testcrossed, we obtain 100 pea plants in the progeny. Calculate the number of pea plants that will be tall and dwarf respectively.

Easy

A

75 Tall and 25 Dwarf
B

50 Tall and 50 Dwarf
C

25 Tall and 75 Dwarf
D

100 Tall and 0 Dwarf

Solution

When a tall pea plant of heterozygous genotype is testcrossed, the phenotypic ratio will be 1 (tall):1(dwarf). Therefore, if total number of progeny is 100. Then 50% of the offspring will be tall and 50% will be dwarf. So, 50 pea plants will be tall and 50 will be dwarf.

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