Hemophilia is Xlinked recessive trait .Consider a cross between a women who is carrier and man who suffers from hemophilia, Which of the folling statements ia true

II and III

Explanation:

I. All sons of these parents will be a hemophiliac.

II. A son who suffers from hemophilia received the hemophilia allele from his mother.

III. Half of the daughters of this cross are predicted to be hemophiliacs.

Assuming the haemophilia allele is represented by h, the alternate form being H.

A woman that is a carrier will have the genotype .

A man who suffers from haemophilia will have the genotype

Crossing both of them:

  x    =  

From the result of the cross, the following can be deduced:

Hence, statements II and III are true.

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

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