Dichotomous Key Explanation
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publish time: 2021-02-26
A vertebrate is an animal with a backbone. In this example, vertebrates are classified based on series of visible characteristics. If it has fur then it is classified as a mammal else they are grouped based on feathers. If it has feathers then it is classified as a bird else they are grouped based on dry skin. If it has dry skin then it is classified as a Reptile else divide the group based on scales. If it has scales it is classified under fishes else classified under Amphibians.
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Hemophilia is a rare disorder in which your blood doesn't clot normally because it lacks sufficient blood-clotting proteins (clotting factors). Hemophilia is a sex-linked recessive disorder. The gene with the instructions for making factor is found only on the sex chromosome labeled X. This genogram shows the family pedigree when the father is with hemophilia and the mother is normal.
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X-linked recessive disorders are also caused by mutations in genes on the X chromosome. In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition. In females (who have two X chromosomes), a mutation would have to occur in both copies of the gene to cause the disorder.
(Refer: U.S. National Library of Medicine)
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X-linked dominant disorders are caused by mutations in genes on the X chromosome, one of the two sex chromosomes in each cell. In females (who have two X chromosomes), a mutation in one of the two copies of the gene in each cell is sufficient to cause the disorder. (Refer: U.S. National Library of Medicine)
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