Which statement concerning in vitro fertilization is false?
a. The odds of having twins or triplets may increase.
b. About 90 percent of in vitro fertilization attempts are successful.
c. The procedure is not typically covered by insurance.
d. There is an increased risk of birth defects in infants conceived using the procedure.
Question 2
How many of the following adolescents are experiencing a change in primary sex characteristics: Larry, who has acquired the ability to ejaculate; Curly, who is producing sperm; and Moe, who is experiencing growth of his scrotum?
a. none
b. one
c. two
d. three
An example of external fertilization.
The correct statement about hormones-insulin and glucagon
Fraternal twins share about 50 percent of their segregating genes.
Sperm and Egg Cell Movements Before and After Fertilization
identical (left) and fraternal (right) twins
Plant Fertilization