Question

Marks 30
Long answer type questions (6*5=30)

1) Distinguish between homologous organs and analogous organs. In which category

would you place wings of a bird and wings of a bat? Justify your answer giving a

suitable reason

2) What is meant by the term speciation? List four factors which could lead to

speciation.

3) With the help of a flow chart explain in brief how the sex of a newborn is

genetically determined in human beings. Which of the two parents, the mother or the

father, is responsible for determination of sex of a child?

4) Distinguish between acquired and inherited traits by giving one example of each.

Why are traits acquired during the lifetime of an individual not inherited?

5) A man with AB blood group marries a woman with O blood group

(i) Work out all the possible phenotypes & genotypes of the progeny.

(ii) Discuss the kind of domination in parents & progeny in this case?

6) How is it possible for a child to have a blood group O if the parents have blood groups A and B?​

Answer 1

Answer:

Homologous organs are defined as the organs which have same structure but different functions whereas Analogous organs are defined as the organs which have same functions but different structure. Wings of a butterfly and wings of a bat are the analogous organs because they have same functions but different structure.