Reproductive cells (sperm in men and ova in women) are different from other human cells in that they:
a. Have an outer coating that can be easily penetrated
b. Have only half as many chromosomes
c. Are tadpole-shaped rather than round
d. Are unaffected by poor nutrition
Question 2
Which one of the following statements most accurately describes the effects of a particular gene on a child's development and functioning?
a. A gene's effects depend partly on the child's health and activity levels and on environmental conditions in which the child lives.
b. A gene is like a computer program that, once started, proceeds through a series of steps to its inevitable conclusion.
c. A gene is essentially a ticking time bomb that is scheduled to explode at a certain time regardless of other things that might be happening in the body.
d. Any single gene's impact is highly unpredictable from one individual to the next.
The age structure of human populations in West Africa and Western Europe, as of 2000.
18 weeks old human fetus
Motile sperm cells of algae and seedless plants.
A cerebral angiogram of a healthy human subject.
The Broad Range of Human Emotions.
Mosaic X Chromosome Expression in Human Females