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palantriel palantriel
wrote...
Posts: 464
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6 years ago
Fraternal twins arise from
  a. fertilization of two eggs by two sperm.
  b. fertilization of two eggs by one sperm.
  c. a split of the morula.
  d. a split of the blastomere.
  e. cleavage of the zygote.

Question 2

Identical twins arise from a split at which stage?
  a. the morula
  b. the blastula
  c. two cells
  d. eight cells
  e. 32 cells
Textbook 
Human Biology

Human Biology


Edition: 10th
Authors:
Read 62 times
2 Replies

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Replies
wrote...
6 years ago
Answer to q. 1

A

Answer to q. 2

C
palantriel Author
wrote...
6 years ago
Thank you for taking the time to explain this, just got my quiz back: Perfect
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