Recessive genes express themselves even when they are heterozygous.
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Q6: The longest period in prenatal development is
Q7: The single cell that is the result
Q8: The amnion,chorion,and placenta form during the preimplantation
Q9: Fertilization is the
A) penetration of an ovum
Q10: The second meiotic division in oogenesis is
Q12: Trophoblast cells secrete human chorionic gonadotropin,which has
Q13: The ectoderm,mesoderm,and endoderm develop during the first
Q14: How long does the pre-embryonic period last?
A)
Q15: For fertilization to take place,sexual intercourse must
Q16: Fertilization usually takes place in the
A) uterus
B)
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