At what level of biological organization does evolution take place?
A. community
B. organism
C. ecosystem
D. population
Answer: D
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Any genetic differences between individuals in a population are called
A. markers. B. alleles. C. polymorphisms. D. SNPs.
Substances that cannot be broken down into simpler substances are called ____________.
A. neutrons B. elements C. compounds D. protons
Matching I. Choose the one most appropriate answer
for each. 1. ___ abortion 2. ___ abstinence 3. ___ coitus 4. ___ douching 5. ___ ejaculation 6. ___ implantation 7. ___ lactation 8. ___ menopause 9. ___ menstruation 10. ___ miscarriage 11. ___ orgasm 12. ___ ovulation 13. ___ tubal ligation 14. ___ vasectomy A. the production and secretion of milk B. sloughing off of endometrium stops permanently C. induced dislodging and removal of an embryo or fetus from the uterus D. an abortion that occurs spontaneously E. the burrowing of the blastocyst into the uterine lining F. the release of an egg from the ovary G. the release of seminal fluid from the male reproductive tract H. a 100-percent-effective method of preventing conception I. a highly unreliable form of birth control J. the periodic elimination of the uterine lining K. characterized by involuntary muscle contractions, release of tension, and warmth L. sexual intercourse M. sperm and egg cannot meet because a section of oviduct is missing N. cutting and tying of vasa deferentia
Clusters of Hox genes are found in
a. flies and frogs only b. flies only c. plants only d. nearly all animals