Given below is a pedigree chart of a family with five children. It shows the inheritance of attached earlobes as opposed to the free ones. The squares represent the male individuals and circles the female individuals Which one of the following conclusions drawn is correct
The parents are homozygous recessive
The trait is $Y$-linked
The parents are homozygous dominant
The parents are heterozygous
If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father ? Comment.
Select the correct sentence for colour blindness ?
Among symbol $A, B$ and $C, C$ indicates
Explain thalassemia.