Reproduction Sex and Preparation for Marriage

Reproduction Sex and Preparation for Marriage pdf epub mobi txt 電子書 下載2025

出版者:
作者:Lawrence Q. Crawley
出品人:
頁數:0
译者:
出版時間:1973-6
價格:39.00
裝幀:
isbn號碼:9780137739370
叢書系列:
圖書標籤:
  •  
想要找書就要到 圖書目錄大全
立刻按 ctrl+D收藏本頁
你會得到大驚喜!!

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 >

具體描述

讀後感

評分

評分

評分

評分

評分

用戶評價

评分

评分

评分

评分

评分

本站所有內容均為互聯網搜索引擎提供的公開搜索信息,本站不存儲任何數據與內容,任何內容與數據均與本站無關,如有需要請聯繫相關搜索引擎包括但不限於百度google,bing,sogou

© 2025 qciss.net All Rights Reserved. 小哈圖書下載中心 版权所有