If a man is color blind (an X-linked trait), how did he get this condition? He got it from either his mom or his dad.
He got it from both his mom and his dad.
He got it from his dad.
He got it from his mom.

He got it from his mom.

Explanation:

An X-linked trait means it is transmitted on the X chromosome.

Females have two X chromosomes (XX), and males have one X and one Y chromosome (XY).

Males get their Y chromosome from their dad, and X chromosome from their mom.

Therefore, the man inherited the colorblindness trait (X chromosome) from his mom

it will increase due to the time span