Pages in this set

Page 1

Preview of page 1
Biology Revision Notes


B1- You and Your Genes


Differences in individuals are called variations
Variation can be effected by genetics and environment
Genes carry the genetic information for every living organism.
Different genes control different characteristics, e.g. eye colour
Genes come in long strips called chromosomes
Chromosomes are made of…

Page 2

Preview of page 2
Dominant alleles controls the development of the characteristic even if you only
inherit them from one parent
Recessive alleles can only control the characteristic if you inherit them from both
parents
Dominants are displayed by capital letters and Recessive by lower case letters
Most characteristics are determined by different genes…

Page 3

Preview of page 3
If one parent is healthy and not a carrier, the disorder cannot be passed on, but if
both parents carry the disease they have a 75% chance of their child either
developing the disease or becoming a carrier
It is possible to test a person for faulty alleles
If tests…

Page 4

Preview of page 4
Then left to divide up till the 8 cells stage, before being screened for alleles which
cause specific genetic disorders
Any healthy embryos are implanted back into the uterus and the pregnancy goes
ahead as normal
There are concerns about this technique and how it plays nature
People believe it…

Page 5

Preview of page 5
Then make a decisions depending on what will benefit the majority of people

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »