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A-Level生物考试应用遗传学知识点

2021-01-13 15:10:51 527人已读 分享到

  A-Level考试共有70多门课程,其中生物课程也是不少学生都喜欢的,尤其是近年来,受到了大家的欢迎,但是在备考的过程中,大家也会发现生物课程学习并没有那么容易,下面就为大家讲解应用遗传学知识点。

  Define genetic screening

  Testing a population for the presence or absence of a gene

  Discuss three advantages and disadvantages of genetic screening

  Advantages

  Lessen the devastating impact of genetic disease

  Identification of persons who have genetically determined susceptibilities to specific environmental agents

  Insurance Companies can give lower premiums

  Disadvantage

  Can stigmatize and emotionally traumatize those who learn that they are carriers of genetic defects

  Invasion of privacy

  Has the potential of being used to dictate who may or may not reproduce

  State that the Human Genome project is an international cooperative venture to sequence the complete human genome

  Discuss two possible advantages of this project

  Understanding of many genetic diseases

  Genome libraries

  Production of gene probes to detect sufferers and carriers of genetic diseases

  Production of pharmaceuticals based on DNA sequences


 A-Level生物考试应用遗传学知识点


  Define clone

  A group of organisms of identical genotype / a group of cells descended from a single parent cell.

  Outline a technique used in the cloning of farm animals

  Early division of a fertilized egg produces 8 cells each of which would give rise to an embryo (totipotency).

  After in vitro fertilization processes the 8 resultant separated embryos can be transferred to surrogate mothers (e.g. cattle or sheep) to continue using selected prime animals for the production of gametes

  At present used for genetically manipulated animals to produce pharmaceuticals

  Discuss the ethical issues of cloning human embryos

  Happens naturally in monozygotic twins

  In vitro fertilization of twins unacceptable?

  Selection of those fit to be cloned

  Eugenics and super-race?

  Discuss the results of crop plant and animal breeding

  Breeding for disease resistance

  Increased food production

  Higher yields of milk/wool/protein

  Breeding plants that can spread

  关于ALevel应用遗传学知识点就为大家介绍到这里了,希望大家能够好好复习,提高备考能力,并且小编建议大家要好好积累词汇,这样才能顺利通过考试,如果还想了解更多关于alevel高分范文、alevel冲刺班的信息,可以在线咨询我们或添加客服微信kewo11!


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