From which layer does the nervous system develop
A) ectoderm
B) endoderm
C) mesoderm
D) embryoblast
Correct Answer:
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Q21: Cell division in gametes is achieved by
A)
Q22: More than 50% of fertilized eggs fail
Q23: Fertilization usually occurs in the
A) uterus.
B) cervix.
C)
Q24: The mother's genes predominantly determine the gender
Q25: A man releases about _ sperm in
Q27: Which layer gives rise to the heart
Q28: Which of the following chromosomal patterns determines
Q29: Biologically, ova and sperm are known as
A)
Q30: The embryoblast transforms into the placenta.
Q31: Twins result from two sperm penetrating an
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