Dolly the sheep was born in 1996. She was unusual because she had no biological father. Sheep have a diploid number of 54 chromosomes in their body cells. The diagram shows the process of how she was produced.
Which of the following statements about this process is/are correct?
1 The gamete cell nucleus contained 27 chromosomes.
2 The cells produced in step 4 had the same properties as stem cells.
3 None of the cells involved in the process were produced by meiosis.

Answer:

13) E

1 – Correct
The gamete is always haploid meaning it would contain half the number of chromosomes as other body cells. Since body cells of sheep have 54 chromosomes, the gametes would contain 27 chromosomes.

2 – Correct
Stem cells are the cells which make the embryo. So stage 4 would have the same properties as stem cells.

3 – Wrong
The gamete used is produced by meiosis.

Since statements 1 and 2 are correct, E is the answer.