Unit 8 notes 7

Question 1

What are examples of genetic disorders that are caused by recessive alleles

Answer 1

Cystic fibrosis, Tay-sachs disease, phenylketonuria

Question 2

Define recessive heredity

Answer 2

Most geneitc disorders are caused by recessive alleles

Question 3

Define cystic fibrosis

Answer 3

condition that cause the formation of thick mucus in the lungs and digestive track

Question 4

Define tay-sachs disease

Answer 4

causes fats (lipids) to accumulate in the central nervous system (the brain)

Question 5

Why does tay - sachs disease mainly affect Jews from eastern Europe?

Answer 5

because Jewish people often marry people within their own religon, so this disorder cannot spread to other religons easily

Question 6

Define phenylkatonuria

Answer 6

The boby can’t change the amino acid phenylalnine into the amino acid trysoine, this can cause damage to the nervous system

Question 7

Define dominate heredity

Answer 7

Some genetic disorders can only be inherited if you have 2 dominate alleles

Question 8

What is an example of a genetic disorder that is caused by a dominate alleles?

Answer 8

huntingtons disease

Question 9

define huntingtons disease

Answer 9

break down of parts of the brain
- onset of this disease does not occur until 30 - 50 years of age