Question
a tall pea plant is crossed with a short pea plant. a tall pea plant is crossed with a short pea plant. All of the offspring that are produced are tall. the pun square for the second cross is shown below
What can be concluded from this cross
Tall pea plants can only produce tall offspring tall pea plants can only produce short offspring tall pea plants can create tall, medium, and even short offspring tall pea plants can carry the short tray and create some tall and short offspring
What can be concluded from this cross
Tall pea plants can only produce tall offspring tall pea plants can only produce short offspring tall pea plants can create tall, medium, and even short offspring tall pea plants can carry the short tray and create some tall and short offspring
Answers
GPT-4o mini
In the scenario you described, we can conclude that the tall pea plant is likely homozygous dominant for the tall trait (TT) and the short pea plant is homozygous recessive (tt). Since all offspring from the first cross are tall, it suggests that "tallness" is dominant over "shortness."
When tall plants are crossed with short plants (TT x tt), all offspring will inherit one dominant allele from the tall parent and one recessive allele from the short parent, resulting in all offspring being heterozygous (Tt) and expressing the tall phenotype.
If a second cross is made by crossing two heterozygous tall plants (Tt x Tt), the Punnett square would show the following genotype ratio:
- 1 TT (tall)
- 2 Tt (tall)
- 1 tt (short)
This would result in 75% of the offspring being tall and 25% being short.
Based on your options, the correct conclusion is:
**Tall pea plants can carry the short trait and create some tall and short offspring.**
This indicates that while the tall plants currently appear tall, they can still be heterozygous for the height trait, carrying the recessive allele for shortness.
When tall plants are crossed with short plants (TT x tt), all offspring will inherit one dominant allele from the tall parent and one recessive allele from the short parent, resulting in all offspring being heterozygous (Tt) and expressing the tall phenotype.
If a second cross is made by crossing two heterozygous tall plants (Tt x Tt), the Punnett square would show the following genotype ratio:
- 1 TT (tall)
- 2 Tt (tall)
- 1 tt (short)
This would result in 75% of the offspring being tall and 25% being short.
Based on your options, the correct conclusion is:
**Tall pea plants can carry the short trait and create some tall and short offspring.**
This indicates that while the tall plants currently appear tall, they can still be heterozygous for the height trait, carrying the recessive allele for shortness.