Two independent monohybrid cross is were crossed out involving a tall pea plant . In the 1st cross the offspring had an equal number of tall and dwarf plants where as the second cross it was all different . Work out the crosses and explain giving reasons for the different offspring population.

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Solution

Dear Student,

In the first cross, the genotype of parents would be Tt and tt (test cross).
The progeny would be:
Gametes: TT and tt

t

t

T

Tt

Tt

t

tt

tt

Progeny: Tt and tt
The ratio of progeny is 1:1

In the second cross, the genotypes of the parents would be TT and tt
Gametes: T T t t

t

t

T

Tt

Tt

T

Tt

Tt

Progeny: All will be Tt
The ratio of the progeny is 100% tall.

The difference in offspring populaiton is due to the differences in the genotypes of the parents.

Regards

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