Which of the following is a neural tube defect that involves incomplete development of the brain and results in stillbirth or death shortly after birth?
A) spina bifida
B) neurulation
C) anencephaly
D) morphogenesis
C
You might also like to view...
During a polymerase chain reaction,
a. a DNA template is mixed with primers, nucleotides, and Taq polymerase. b. the sample is heated in order to allow the two strands of DNA to separate completely. c. some of the primers base-pair with template DNA. d. Taq polymerase performs DNA synthesis from the primers. e. all of these occur
Which of the following events occur(s) during the
follicular phase of the menstrual cycle? a. An ovarian follicle enlarges. b. A zona pellucida forms around the oocyte. c. An oocyte completes meiosis I. d. Estrogen levels increase. e. All of these occur.
A botanist studying a plant with geographically separated and morphologically distinct populations wants to know the degree to which the differences between the populations are attributable to genetic factors
Outline a simple experiment she can perform to address this question.
A group is experimenting with selection in an insect species due to exposure to a newly developed insecticide, cpd AW143. The group has found that after 10 generations of exposure, the population is now bimodal in its response to the drug
Close to 30% of the population are completely normal while 70% live only about 1/6 of the normal lifetime. This is an example of __________. A) threshold effect B) stabilizing selection C) additive genes D) directional selection E) disruptive selection