Reproduction Sex and Preparation for Marriage pdf epub mobi txt 电子书 下载 2024


Reproduction Sex and Preparation for Marriage

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Lawrence Q. Crawley
1973-6
0
39.00
9780137739370

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发表于2024-12-28

Reproduction Sex and Preparation for Marriage epub 下载 mobi 下载 pdf 下载 txt 电子书 下载 2024

Reproduction Sex and Preparation for Marriage epub 下载 mobi 下载 pdf 下载 txt 电子书 下载 2024

Reproduction Sex and Preparation for Marriage pdf epub mobi txt 电子书 下载 2024



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I<br > i<br > :Human life begins when a sperm cell and an egg eel1 unite. The sperm<br > cell develops within the father, the egg cell within the mother. The<br > union ta~es place within the reproductive tract of the mother.after sex-<br > ,uaFintereoursd: Ms in essence is the story of human reproduction.<br > Sex, always related to reproduction, also exists apart from it. The<br > meaning of sex ranges from the bodily differences between male and<br > ~female to the complex drive responsible for life itself and for many of its<br > lJleasures and problems. We will begin our discussion of reproductiori and<br > sex with the bodily differences between male and female. Sex in this<br > sense is fixed at the instant the sperm and egg cells unite (conception).<br > BODILY DIFFERENCES BETWEEN<br > THE SEXES<br > In every sperm and egg cell there are t~~ microscopically<br > small bodies called chromosomqs~ which constitute the principal working<br > machinery of hered~f~, ~ng the determination of sex. All egg cells<br > have similar "sex" chromosomes (x). Half of the sperm cells have one<br > small "sex" chromosome (y) and the other half have an x similar to<br > that of the egg cell. If a ~ fferm cell with a y chromosome fertilizes an<br > egg cell, the individual is male (xy); otherwise it is female (xx). This<br > 1<br >

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