Unit 8.3- Sex determination

what is color blindness

the inability to distinguish some color from others

how does color blindness occur

some cone cells in the eye fail to produce the protein that responds to light

what is the most common color blindness

red-green

it is recessive X-linked chromosome

why is it harder for women to be color blind rather than men

because women have two X chromosomes the need two recessive alleles for the color blindness to be apparent

why is it easier for men to be color blind rather than women

because they only have one X chromosome, so if there is a small chance they may be colorblind, and recieve the recessive allele, they are color blind

what is an autosomal disorder

gene if affected within one of the first 22 chromosomes

what is a sex- linked disorder

the gene is affected within the last (23) chromosome (gametes)

what is hemophilia

a recessive sex linked disorder

why is hemophilia rare and what is it

where the blood doesnt clot normally because it lacks sufficient blood-clotting proteins

what is a treatment for hemophilia

regular replacement of the specific clotting factor that is reduced

how does a person develop hemophilia

when a persons immune system attacks clotting factors in the blood

what are factors that can allow a person to acquire hemophilai

pregnancy

autoimmune conditions

cancer

multiple sclerosis

what is a pedigree chart

diagram that shows the occurrence and appearance or phenotypes of a particular gene or organism

where does cystic fibrosis occur

mutation on chromosome 7