A trend toward the decrease in the size of plants on the slopes of mountains as altitudes increase is an example of
A) a cline.
B) a bottleneck.
C) relative fitness.
D) genetic drift.
E) geographic variation.
Ans: A) a cline.
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Prenatal diagnosis techniques such as amniocentesis and chorionic villus sampling remove cells produced by the embryo. These cells are then used ____.
a. to treat diseases b. for implantation to produce pregnancy c. to develop embryonic stem cells d. to test for the presence of mutant alleles or chromosomal alterations e. for cloning
__________ is a field of study concerned with the origins, evolution, and persistence of life on Earth
as it relates to life in the universe. Fill in the blank(s) with the appropriate word(s).
An animal zygote is a(n) haploid cell
__________________ Indicate whether the statement is true or false.
Which of the following is responsible for nearly 100,000 human deaths worldwide every year?
A) Entamoeba histolytica B) Amoeba proteus C) plasmodial slime molds D) Dictyostelium discoideum