The notochord develops in which stage of embryonic development?
A. gastrulation
B. cleavage
C. neurulation
D. blastulation
Answer: C
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The parasympathetic ganglia are arranged in an orderly chain along the spinal cord
Indicate whether the statement is true or false.
If one person in 50 is a carrier of an autosomal recessive disorder in a population, the chance that an unrelated man and woman are both carriers is
A) 1/50. B) 1/100. C) 1/1000. D) 1/2500.
At which point during pregnancy can human chorionic gonadotropin be detected in the mother’s blood?
1.at the time of fertilization 2.at the time of implantation 3.by the first week of pregnancy 4.by the third week of pregnancy 5.by the sixth week of pregnancy
Ecologists are concerned about amphibian populations because
A. amphibians are very sensitive to environmental change-they may be indicating serious problems. B. their loss would be an aesthetic loss to the planet. C. of the possibility of numerous medicinal uses. D. they are keystone species in many areas-their loss will cause other populations to crash. E. they are increasing to the point of competing with indigenous species.