A cross between two heterozygous tall pea plants (Tt x Tt) gives what proportion of tall offspring?
Answer and explanation
Correct answer: D. 3/4
- Step 1: The offspring are 1 TT : 2 Tt : 1 tt, so three out of four are tall. Answer: 3/4. Why not the others: 1/4: That is the proportion of short plants. 1/2: That is the proportion of heterozygous plants. All: Short plants appear in the F2 when both parents carry the recessive allele.
Practise more Genetics, reproduction and ecology.
Free questions with an explanation for every one, and full timed Kenya KCSE mock tests.
More Genetics, reproduction and ecology questions
- In humans, how many chromosomes are in a normal body cell?
- Colour blindness is more common in males than females because the gene is
- A woman who is a carrier of haemophilia marries a normal man. What proportion of their sons is expected to have haemophilia?
- Which process produces gametes with half the chromosome number?
- Which of the following is an example of a primary consumer?
- In the food chain grass, grasshopper, frog, snake, which organism has the least energy available to it?