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(D) Mendelian disorders are primarily determined by alteration or mutation in a single gene.$i$. Hemophilia is a sex-linked recessive Mendelian disord

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$i, iii$ and $iv$

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(D) Mendelian disorders are primarily determined by alteration or mutation in a single gene.$i$. Hemophilia is a sex-linked recessive Mendelian disorder.$ii$. Down's syndrome is a chromosomal disorder caused by the presence of an additional copy of chromosome number $21$ (trisomy).$iii$. Cystic fibrosis is an autosomal recessive Mendelian disorder.$iv$. Color blindness is a sex-linked recessive Mendelian disorder.$v$. Night blindness is typically caused by Vitamin $A$ deficiency,not a genetic disorder.Therefore,the Mendelian disorders are Hemophilia $(i)$,Cystic fibrosis $(iii)$,and Color blindness $(iv)$.

Consider the following human disorders: $i$. Hemophilia,$ii$. Down's syndrome,$iii$. Cystic fibrosis,$iv$. Color blindness,$v$. Night blindness. Which of these represent Mendelian disorders?

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