In this case, "T" represents the dominant allele for tallness, and "t" represents the recessive allele for shortness. When you cross two Tt plants, you can use a Punnett square to determine the possible genotypes of the offspring.
The possible combinations of alleles from Tt × Tt are:
- TT (tall)
- Tt (tall)
- Tt (tall)
- tt (short)
So, the resulting genotypes from the cross would be:
- 1 TT
- 2 Tt
- 1 tt
This gives us a total of 4 possible genotype combinations.
Since only the genotype "tt" results in a short plant, we can calculate the percentage of short offspring as follows:
- Number of short offspring (tt) = 1
- Total number of offspring = 4
The percentage of short offspring is:
\[ \text{Percentage of short offspring} = \left(\frac{\text{number of short offspring}}{\text{total number of offspring}}\right) \times 100 = \left(\frac{1}{4}\right) \times 100 = 25% \]
Therefore, 25% of the offspring will be short.
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