Lecture 23: Introduction to Genetics

Question 1

What causes red hair?

Answer 1

A mutation in the Melanocortin 1 receptor, MC1R(on chromosome 16), which leads to an inability to make eumelanin (black / brown pigment) so only pheomelaning (red / yellow pigment) is made.
The MC1R mutation is recessive .

Question 2

What is the exome?

Answer 2

An exome is the DNA sequence complementary to all of the mRNA made from the genome.