To determine the percentage of tall offspring from a cross between a heterozygous tall pea plant (Tt) and a homozygous recessive short pea plant (tt), we can set up a Punnett square.
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Parent Genotypes:
- Parent 1 (heterozygous tall): Tt
- Parent 2 (homozygous recessive short): tt
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Possible Gametes from each parent:
- Parent 1 can produce gametes: T or t
- Parent 2 can produce gametes: t or t
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Punnett Square:
T | t ------------------ t | Tt | tt ------------------ t | Tt | tt
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Offspring Genotypes:
- Tt (tall): 2 squares
- tt (short): 2 squares
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Percentage Calculation:
- Total offspring: 4 (2 Tt + 2 tt)
- Tall offspring (Tt): 2 out of 4
Thus, the percentage of tall offspring is: \[ \frac{2}{4} \times 100 = 50% \]
Therefore, the expected percentage of the offspring that is tall is 50%.