Question

what is colourblindness. give it's symptoms and causes . make a pedigree analysis for :1)carrier mother and normal father
2)carrier mother and an affected father.

please answer ​

Answer 1

Answer:

Color blindness is a genetic condition caused by a difference in how one or more of the light-sensitive cells found in the retina of the eye respond to certain colors. These cells, called cones, sense wavelengths of light, and enable the retina to distinguish between colors. This difference in sensitivity in one or more cones can make a person color blind.

Common symptoms of color blindness include:

➡️Difficulty distinguishing between colors

➡️Inability to see shades or tones of the same color

Answer 2

Color Blindness

Explanation:

Color vision deficiency is the inability to distinguish certain shades of color. The term "color blindness" is also used to describe this visual condition, but very few people are completely color blind. Normal color vision is known as trichromacy - tri because it uses all three types of cones correctly allowing us to see so many brilliant colors. There are 3 kinds of color blindness.

1. Red-Green Color Blindness.
2. Blue-Yellow Color Blindness.
3. Total Color Blindness.

The condition can be acquired genetically from the mother or father. The 23rd chromosome is made up of two parts – either two X chromosomes if you are female or an X and a Y chromosome if you are male. The faulty ‘gene’ for color blindness is found only on the X chromosome.

So for a boy to be color blind, the faulty color blindness ‘gene’ has to appear on his X chromosome.

For a girl to be color blind it must be present on both of her X chromosomes.

If a woman has only one color blind ‘gene’ she is known as a ‘carrier’ but she won’t be color blind.

This carrier can pass the disorder to a daughter or son genetically in case the father also happens to be a carrier.

But if only the father has the disorder, he won't be able to pass on the genes to the son.