When a researcher transplanted the nucleus of an intestinal cell from a tadpole into an egg cell whose nucleus had been destroyed, the egg developed into a normal frog. This illustrates that:
A) each cell of an organism has all the genes needed for development.
B) the homeobox genes in a transplanted nucleus undergo mutation.
C) a nucleus that is removed from its normal location is influenced by adjoining cells.
D) scientists can clone a human by putting one of his or her nuclei into an egg cell.
E) genes are lost in differentiation.
Correct Answer:
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Q1: Human embryos differ from bird embryos in
Q2: One characteristic of animal development is the
Q4: The cells that line the inside of
Q5: Which of the following is the result
Q6: At the blastula stage, the embryo consists
Q7: Which germ layer forms the pancreas?
A)endoderm
B)ectoderm
C)mesoderm
D)somite
E)amnion
Q8: In placental organisms, the _ is the
Q9: Which extraembryonic membrane lies immediately beneath the
Q10: During the embryonic stage, a hollow ball
Q11: _ is the developmental event that results
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