There are no cases of -XX or Y individuals, but X individuals do exist. Propose an explanation for this statistic
What will be an ideal response?
Embryos without an X chromosome are not observed in miscarriages; these must be eliminated early in development—perhaps even before pregnancy is recognized. At least one copy of an X chromosome is essential for survival. The most likely explanation is that the X chromosome contains the majority of genes that encode for human development and that the Y chromosome is primarily the carrier of genes responsible for development into a male. Research has shown this to be the case.
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The process of evolutionary changes that result in formation of new species and groups of species is called
A. temporal evolution. B. artificial selection. C. macroevolution. D. serial evolution. E. a combination of temporal and serial evolution.
What is the function of xylem?
a. It conducts water downward in the plant. b. It transports food upward in the plant. c. It transports minerals and water throughout the plant. d. It transports photosynthetic materials from stem to leaf. e. It slows the evaporation of water from the plant.
A frontal plane is indicated by
a. A. b. B. c. C. d. D. e. E.
A phosphate group binds to what molecule to create the "backbone" of the DNA molecule?
A) Adenine B) Deoxyribose C) Ribose D) Other phosphate molecules