【英语时差8,16】动物界的染色体有何不同？
时间：2019-03-06 作者：英语课 分类：英语时差8，16
In mammals, the sex of a baby is determined 1 by the combination of chromosomes 3 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 sperm 4 and the female egg come together, each one contributes one sex chromosome 2. 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 embryo 5 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.
- 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。
- 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。
- 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》
- 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。