In the technique of embryo splitting, _____
a. two embryos are fused
b. an embryo is split apart to form two identical individuals
c. two sperm are used to fertilize a single egg
d. two eggs and two sperm are used to form two embryos
e. an embryo’s nucleus is removed and replaced with an adult embryo
ANSWER: b
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The effect of parathyroid hormone is to ________ blood calcium levels
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Which one of the following is TRUE regarding mature human gametes?
A) produced by the process of mitosis B) contain the haploid number of chromosomes C) produced in the testes and oviducts D) are also known as primary spermatocytes and primary oocytes E) contain 46 chromosomes
Site-specific recombination systems ________.
A. depend on enzymes that are often specific for sequences within the host B. are features of some viruses C. do not depend on extensive nucleotide sequence homology D. All of the choices are correct.
Which individuals are most likely to survive in a given environment?
a. Ones with negative traits b. Ones with adaptive traits c. Ones with neutral traits d. Everyone has an equal chance