Anil Ahlawat Solutions for Chapter: Heredity and Evolution, Exercise 2: EXERCISES

Humans inherit colour of their eyes from their parents. Brown-eyed couple has three blue-eyed children. Which of the following statements gives correct explanation of this situation?
(i) Each parent has an allele for brown eyes and an allele for blue eyes.
(ii) The allele for blue eyes is recessive. 
(iii) The probability that their next child will have blue eyes is $0.75$.
(iv) The probability that their next child will have brown eyes is $0.5$. 

For evolution to occur in a population, which of the following must happen?

Read the given passage and answer the following questions. 
Siddhi studied forelimbs of three organisms and described them as follows:
Organism X- Long and short bones, covered with muscles, used for running. 
Organism Y- Long and short bones, covered with feathers used for flying. 
Organism Z - A layer of a complex chemical with supporting framework which is not made of bones and used for flying.

Select the option that shows correct relationship between these on organisms.

Forelimbs of organisms X and Y are _____ organs while forelimbs of organisms Y and Z are _____ organs.

Given pedigree chart depicts the inheritance of attached ear-lobes, an autosomal recessive trait.

Which of the following conclusions drawn is correct?