Question

Among the following which one is a hereditary trait?
A. Eye colour
B. Hair colour
C. Blood group
D. All of these

Answer 1

Traits are noticeable characteristics that are passed down from parent to the next generation.
An individual will have several traits they share in mutual with others and more common with their siblings and parents.
An individual's total arrangement of traits makes them unique from others.
An equal number of traits are passed on from each parent of an individual.

Complete answer:
DNA is responsible to convey genetic material that is inherited from one generation to the next generation. Most of the traits detected in a child are inherited from his/her parents. Eye colour, hair colour and blood group all can be inherited to the next generation.
Option A – Eye colour: A child's eye colour depends on the coupling of genes passed on from each of the parents. If both parents of a child have blue eyes then the child will have blue eyes. The brown form of the eye colour gene or allele is dominant, while the blue eye allele or gene is recessive.
So, it is correct information.
Option B – Hair colour:Genetic factors seem to play a vital role in determining hair colour.
So, it is correct information.
Option C – Blood group:Every person has an ABO blood type (it includes A, B, AB or O blood groups) and an Rh factor or Rhesus factor (whether it’s positive or negative). Just like eye colour or hair colour our blood group is inherited from our parents. Each biological parent donates one of two ABO genes to their child whereA and B genes are dominant and the O gene is recessive.

So, here the correct answer is option D ‘All of these’.

Note:
All human beings have the same genes organized in the same order. About $99.9\%$ of DNA sequence in everybody is the same. It is the rest $0.1\%$ of the genetic code that accounts for all the variances between people. Those limited dissimilarities between us make each one of us unique.