The risk for Down syndrome increases in situations where the
A. mother is 20?29 years old.
B. father is 35?50 years old.
C. mother is 35?45 years old.
D. father is 20?29 years old.
E. both parents are 30?35 years old.
C
You might also like to view...
When two genes on the same chromosome are located 10 map units from each other, ____ of the
offspring from a testcross for genetic linkage should have a recombinant phenotype.
a. over 75% b. about 50% c. about 25% d. about 10% e. about 5%
Humans and chimps are both able to
A. walk upright. B. walk upright and use tools. C. use tools and communicate. D. use tools. E. communicate.
Four of the five choices listed below relate to
speciation. Select the exception. a. postzygotic b. allopatric c. parapatric d. punctuation e. sympatric
What is the name for molecules that provoke a specific immune response?
A. Antibodies B. Lymphocytes C. Antigens D. Lysozymes