If a plant with genotype Tt is crossed with a plant of genotype tt, what fraction of the offspring will be tall?
Practice Questions
1 question
Q1
If a plant with genotype Tt is crossed with a plant of genotype tt, what fraction of the offspring will be tall?
0
1/4
1/2
3/4
The cross Tt x tt results in 50% Tt (tall) and 50% tt (short), so the fraction of tall offspring is 1/2.
Questions & Step-by-step Solutions
1 item
Q
Q: If a plant with genotype Tt is crossed with a plant of genotype tt, what fraction of the offspring will be tall?
Solution: The cross Tt x tt results in 50% Tt (tall) and 50% tt (short), so the fraction of tall offspring is 1/2.
Steps: 6
Step 1: Identify the genotypes of the parent plants. One plant has genotype Tt (tall) and the other has genotype tt (short).
Step 2: Write down the possible gametes (sperm or egg cells) from each parent. The Tt plant can produce gametes T and t, while the tt plant can only produce gametes t.
Step 3: Set up a Punnett square to visualize the cross. Place the gametes from one parent on the top and the gametes from the other parent on the side.
Step 4: Fill in the Punnett square by combining the gametes. The combinations will be Tt and tt.
Step 5: Count the offspring genotypes from the Punnett square. You will have 1 Tt (tall) and 1 tt (short).
Step 6: Calculate the fraction of tall offspring. There is 1 tall plant (Tt) out of 2 total plants, which gives a fraction of 1/2.
