lecture 6

Question 1

autosomal recessif disease

Answer 1

1. Cystic fibrosis
   
   2. Sickle cell anemia
   3. Tay sachs disease

Question 2

hemopholia

Answer 2

• Is it a rare genetic bleeding disorder caused by a shortage of certain clotting factors. These are needed to help stop bleeding after a cut or injury to prevent spontanoues bleeding.
  
  • 20,000 people in US suffer from it

** X-linked recessive

Question 3

duchenne muscular dystrophy, what time of genetic transmission

Answer 3

X-linked recessive

Question 4

rett syndrome, what time of genetic transmission

Answer 4

X-linked dominant

Question 5

formula number of possible gentoypes with multiple alleles

Answer 5

(n(n+1)/2

n= number of alleles

Question 6

what is compund heterozygote

Answer 6

an individual who carries 2 different alleles at a locus that results in a recessive phenotype

Question 7

relative amount of red and yellow pigments in the pepper

Answer 7

1. Precursor is transformed to phyotene by the enzyme: phytoene synthase which is encode in the Y locus
   
   2. Phytoene to violaxanthin by multiple enzymes
   3. Red and yellow pigments by the CC synthase (the C locus controls this step)
      * * the amount of pigments determine the colour of the pepper

Question 8

examples of different types of epilstatis

Answer 8

Example of recessive epistatsis: coat color in labrador
Of dominant epistasis: color in squash
Of duplicate recessive epistasis: alibinism in snails