COLOUR BLINDNESS

A normal man x Carrier female

• 25% Normal female: 25% colour blind male: 25% Carrier female:25% normal male

• 50% Normal female: 50% colour blind male

• 75% Carrier female:25% normal male

• 25% Normal female: 50% colour blind male: 25% Carrier female

Colour blind male x Normal (Homozygous ) female

• 75% Carrier female:25% normal male

• 25% Carrier female:75% normal male

• 100% normal males

• 50% Carrier female:50% normal male

If a normal female wants to have children with a color-blind male, what is the probability of having a son who is color blind?

• 50%

• Nil

• 100%

• 25%

If a color-blind female wants to have children with a normal male, what is the probability one of their sons could be color blind?

• 50%

• 25%

• 100%

• Nil

If a female carrier wants to have children with a color-blind male, what is the probability of one of their sons could be color blind?

• 25%

• 50%

• Nil

• 100%

Colour blindness genes show

• Monohybrid inheritance

• Co-dominance

• Sex linked inheritance

• Incomplete dominance

Genes for Red and green colour are located in Which sex chromosomes

• Y chromosome

• X chromosome

• X and Y chromosome

• body chromosome

The test for identifying colour blindness is

• DNA fingerprinting

• Ishihara test

• Eye test

• Gene test

Person with colour blindness cannot identify

• Green colour

• Both red and green

• Red only

• Blue only

A carrier normal female has

• Both normal allele

• one normal and one recessive

• both recessive

• Abnormal allele