Principles of Inheritance and Variation Question 157
157. Which one of the following symbols and its representation, used in human pedigree analysis is correct?
[2010]
(a) $\square=$ mating between relatives
(b) $\bigcirc=$ unaffected male
(c)
(d)
Show Answer
Answer : a
Hints & Solution
(a) Pedigree analysis is a record of the occurrence of a trait in several generations of a human family. In this, male members are shown by squares and female by circles. Sibs are represented horizontally on a line in order of birth. It helps us in giving information about genotype of an individual for trait under investigation.
