Polydactyly in humans is due to:

What is the cause of sickle cell anemia?

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?

Color blindness is more common in males because it is a:

Which of the following genotypes results in hemophilia in females and males respectively?
$\quad\quad$ Female $\quad\quad$ Male

Write a short note on Haemophilia.