How Many Recessive Alleles Are Needed For A Female To Be A Carrier?

Usually it is the X chromosome that is considered in which case the female will have two alleles, the male will only have one. The genetic condition of haemophilia is carried on the X chromosome. The normal allele is dominant (H), the allele for haemophilia is recessive (h). XHXH = normal female

How many total alleles do females have for the gene for?

But, if she has the genotype X-X-, she has two mutant alleles and would have the disease. The XY male will be normal but the X-Y male has the mutant gene on his X chromosome and will express this as the disease hemophilia or colorblindness.

Can a female have both homozygous and recessive genes?

You can recall that recessive traits are only shown if they are homozygous (both copies of the alleles are recessive). For a female to have the disease, both of her X chromosomes must carry the recessive diseased copies of alleles.

Can a male carrier pass a recessive gene to his child?

Carriers can pass abnormal genes to their children. The term "sex-linked recessive" most often refers to X-linked recessive. X-linked recessive diseases most often occur in males. Males have only one X chromosome. A single recessive gene on that X chromosome will cause the disease.

Which is recessive to the A and B alleles?

In the ABO blood groups inheritance, the A and B alleles are co-dominant, and O is recessive to both the A and B alleles. If a man with type B blood and a woman with type A blood marry, the phenotype of their children could be

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