w**d
发帖数: 362 | 1 做OB的练习题，有道题很有意思。
Question 7:
Many couples attempt to influence the gender of the child they are trying to
conceive by using special sexual positions, eating special food, or having
intercourse at specific times. None of these are factors in the
determination of the gender of the conceptus. What has research shown about
gender determination?
You selected: There is a 50-50 chance of having a male or a female
Correct
Explanation:
Sex determination occurs at the time of fertilization based on the
inheritance of X or Y chromosomes. Because the spermatozoon can have either
an X or a Y chromosome, the male gamete is responsible for fetal sex
determination. Research indicates that there is an approximately 50-50
chance of either occurrence. 是专家在这里胡扯吓唬人？
俗语说：灾年多生男，富家多生女。大鱼大肉的饮食会生女。 |
|
