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
Sickle -cell anaemia has not been eliminated from the African population because it
If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness ?
Describe pedigree analysis and draw its symbols.
Phenyketonuria is a genetic disorder of