nature vs nurture

Question 1

point colouring in Himalayan rabbits and cats

Answer 1

white boides and extremities are dark ( so melanin has been produced.

Question 2

melanin

Answer 2

dark pigment

Question 3

tyrosinase

Answer 3

an enzyme that produces melanin. this is only produced at low temperatures.

Question 4

why are Siamese cats white but have black ears

Answer 4

because ears have a smaller surface area to volume ratio and are colder in temperature.

Question 5

epigenetics

Answer 5

the study of heritable phenotype changes that don’t change DNA

Question 6

molecular tags

Answer 6

genes can be switched on and off in DNA such as methylation and acetylation.

Question 7

methylation

Answer 7

don’t read this part of the DNA ( methyl is added ).

Histones are wrapped more tightly

Question 8

acetylation

Answer 8

histones are wrapped loosely and spread out more so they can be read more promptly.

Question 9

agouti mice

Answer 9

is the agouti gene is methylated the mouse is brown and small. If it isn’t methylated then the mouse is obese and yellow. However, they are genetically identical. Due to folic acid in a diet, they can have more off springs with methylated genes.