Out of the 200500 million sperm cells that are released during an ejaculation, only ____ complete the short journey up the Fallopian tubes to where an egg is waiting to be fertilized.
a. half
b. a few thousand
c. a few hundred
d. a few hundred thousand
Question 2
In the study by Kobayashi-Winata and Power (1991), were there any differences in the childrearing techniques of middle-class parents from Japan and America?
a. In both cases, parents used high amounts of punishment.
b. Japanese parents were higher in control and lower in warmth.
c. American parents were low in control and low in warmth.
d. American parents relied on external punishments, such as sending a child to his/her room, whereas Japaneseparents used more verbal comments, explanations and reprimands.
Fertilization of an egg by a sperm.
Whitefish blastula cells
B and T Cells
Normal Red Blood Cells
Over time, cells acquire mutations. Two independently acquired mutations in the same cell may be suf
Light micrograph of cells in a strand of Chladophora