Question on: JAMB Biology - 2001
A tall plants crossed with a dwarf one produces offspring of which half are tall and half are dwarf. What are the genotypes of the parents?
A
TT, TT
B
Tt, tt
C
TT, tt
D
Tt, Tt
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Correct Option: B
Here's the explanation:
* **Understanding the Problem:** The question describes a classic Mendelian genetics problem. The key is that the offspring ratio is 1:1 (half tall, half dwarf). This indicates that one parent must be heterozygous and the other homozygous recessive.
* **Analyzing the Options:**
* **A. TT, TT:** If both parents were homozygous dominant (TT), all offspring would be tall (TT). This doesn't match the 1:1 ratio.
* **B. Tt, tt:** This is the correct answer.
* Tt (tall) crossed with tt (dwarf)
* Possible gametes: T, t from Tt and t from tt
* Offspring genotypes: Tt, tt
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