Question
A tall pea plant is crossed with a short pea plant. All of the offspring that are produced are tall. Two of these tall offspring are crossed. The Punnett square for this second cross is shown below. TT 25%, Tt 25%, Tt 25%, tt 25%
What can be concluded from this cross? A. tall pea plants can only produce tall offspring. B. tall pea plants can only produce short offspring. C. tall pea plants can create tall, medium, and even short offspring. D. tall pea plants can carry the short trait and create some tall and short offspring.
What can be concluded from this cross? A. tall pea plants can only produce tall offspring. B. tall pea plants can only produce short offspring. C. tall pea plants can create tall, medium, and even short offspring. D. tall pea plants can carry the short trait and create some tall and short offspring.
Answers
GPT-4o mini
To analyze the results of the cross, we need to consider the genotypes involved.
1. The initial cross was between a tall pea plant (which we can assume has the genotype Tt or TT for the dominant tall trait) and a short pea plant (genotype tt). Since all offspring are tall, we can conclude that the tall plant is at least heterozygous (Tt) because the short plant (tt) can only contribute the recessive allele (t).
2. When two tall offspring (which could be Tt x Tt) were crossed, the Punnett square indicates the following offspring ratios:
- TT: 25%
- Tt: 50% (25% + 25%)
- tt: 25%
This indicates that the offspring will have genotypes of 25% TT (tall), 50% Tt (tall), and 25% tt (short).
Based on this analysis, the most accurate conclusion from the options provided would be:
**D. tall pea plants can carry the short trait and create some tall and short offspring.**
This is correct because while all tall plants can be produced from the first cross, the second cross shows that tall plants can also carry the allele for shortness (t) and thus produce short offspring.
1. The initial cross was between a tall pea plant (which we can assume has the genotype Tt or TT for the dominant tall trait) and a short pea plant (genotype tt). Since all offspring are tall, we can conclude that the tall plant is at least heterozygous (Tt) because the short plant (tt) can only contribute the recessive allele (t).
2. When two tall offspring (which could be Tt x Tt) were crossed, the Punnett square indicates the following offspring ratios:
- TT: 25%
- Tt: 50% (25% + 25%)
- tt: 25%
This indicates that the offspring will have genotypes of 25% TT (tall), 50% Tt (tall), and 25% tt (short).
Based on this analysis, the most accurate conclusion from the options provided would be:
**D. tall pea plants can carry the short trait and create some tall and short offspring.**
This is correct because while all tall plants can be produced from the first cross, the second cross shows that tall plants can also carry the allele for shortness (t) and thus produce short offspring.