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【英语时差8,16】动物界的染色体有何不同?

时间:2015-11-06 07:26来源:互联网 提供网友:yajing   字体: [ ]
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 In mammals, the sex of a baby is determined1 by the combination of chromosomes3 it inherits from its parents. Nearly every cell in a male body has two different sex chromosomes–one is shaped like an X and one is shaped like a Y. Females also have two sex chromosomes in each cell but they are both X-shaped. When the male sperm4 and the female egg come together, each one contributes one sex chromosome2. The female always contributes an X chromosome while the male can provide either an X or a Y. If the male provides an X then the embryo5 has two X chromosomes and becomes a female. If the male provides a Y then the embryo has one of each and grows into a male.


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1 determined duszmP     
adj.坚定的;有决心的
参考例句:
  • I have determined on going to Tibet after graduation.我已决定毕业后去西藏。
  • He determined to view the rooms behind the office.他决定查看一下办公室后面的房间。
2 chromosome 7rUzX     
n.染色体
参考例句:
  • Chromosome material with exhibits of such behaviour is called heterochromatin.表现这种现象的染色体物质叫做异染色质。
  • A segment of the chromosome may become lost,resulting in a deletion.染色体的一个片段可能会丢失,结果产生染色体的缺失。
3 chromosomes 11783d79c0016b60332bbf1856b3f77d     
n.染色体( chromosome的名词复数 )
参考例句:
  • Chromosomes also determine the sex of animals. 染色体也决定动物的性别。 来自《简明英汉词典》
  • Each of four chromosomes divide longitudinally. 四种染色体的每一种都沿着纵向分裂。 来自《现代汉英综合大词典》
4 sperm jFOzO     
n.精子,精液
参考例句:
  • Only one sperm fertilises an egg.只有一个精子使卵子受精。
  • In human reproduction,one female egg is usually fertilized by one sperm.在人体生殖过程中,一个精子使一个卵子受精。
5 embryo upAxt     
n.胚胎,萌芽的事物
参考例句:
  • They are engaging in an embryo research.他们正在进行一项胚胎研究。
  • The project was barely in embryo.该计划只是个雏形。
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