Theme 2 3 and 4 review

Question 1

Mytulis mussels

Answer 1

produce a strong “glue” 5
* Marine mussels cling to rocks & are remarkably
resistant to the pounding of water.
* Fibers holding mussels to rocks are proteins
secreted by the muscular foot of the mussel.
* These proteins have keratin and a resinous
protein and other proteins, which form a strong,
tough, adhesive known as byssus.
Byssus – remarkable underwater adhesive
* Genetic engineers insert segments of mussel
DNA into yeast cells, serve as “factories”
translating mussel genes into byssus
* Surgeons want better ways to hold repaired
body parts together, dentists, adhesive
manufacturers, for other human needs

Question 2

Kermode spirit bear

Answer 2

Is a white subspecies of the American
black bear. It is not an albino, since its
skin & eyes are pigmented
* A single nucleotide mutation results in
modified protein product from the mc1r
gene.
ermit Ritland & coworkers identified single
nucleotide mutation in the melanocortin 1
receptor gene (mc1r), which caused
a tyrosine-to-cysteine replacement at codon 298.
* The mc1r gene encodes for a protein
responsible for regulating skin and hair colour
in mammals.

Question 3

Eden Atwood

Answer 3

Androgen Insensitivity
A mutation that changes the nucleotide sequence of a
single gene, causing a single type defective protein to
be produced.
* Person who is genotypically (46, XY). No functional
androgen receptor proteins, so cells are unable to
respond to testosterone