First slide

Inheritance of One Gene

Question

If we spray a genetically dwarf pea plant with gibberellin it grows tall. Now we cross fertilize this tall pea plant with a homozygous tall pea plant. The offspring will have:

Easy

A

only dwarf plants.
B

50% of the offspring will be tall and 50% dwarf.
C

75% of the offspring will be tall and 25% dwarf.
D

all the offspring produced will be tall.

Solution

When we are spraying a genetically dwarf (tt) pea plant with gibberellin then the gibberellin helps to increase the stem height by compensating for no production of gibberellin by the dwarf pea plant. But the genotype of the dwarf pea plant does not change. So, we when cross this pea plant with homozygous tall pea plant we observe that 100% of the pea plants are heterozygous tall.

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