Chapter 9 – Heredity and Evolution

Assertion: Specialization is the reproductive isolation amongst once interbreeding population.
Reason: Genetic drift, Natural selection and Severe DNA change can cause specialization.

Assertion: Acquired trait cannot be passed on from one generation to next generation.
Reason: Inaccuracy during DNA copying of acquired trait is minimum.

Human offspring’s sex is determined

Wing of a bird and wing of an insect are

Which concept was not included in Charles Darwin’s theory of Natural Selection?

The remaps (or impressions) of dead animals or plant? that lived in the remote past are known as

Natural selection is called ‘survival of the fittest’. Which of the following statements best describes an organism?

The process by which new species develop from the existing species is known as

The more characteristics two species have in common :

A cross between two individuals results in a ratio of 9 : 3 : 3 :1 for four possible phenotypes of progeny. This is an example of a

Two pink colored flowers on crossing results in 1 red, 2 pink and 1 white flower progeny. The nature of the cross is-

Differences between organisms in a species are described as variation. Which of the following would you describe as continuous variation?

Those organs which have the same basic structure but different functions are called

A man with blood group A marries a woman having blood group O. What will be the blood group of the child?

The concept of origin of species by natural selection was given by.

Which of the following is not correct-

Which of the following is the ancestor of ‘Broccoli’?

The process of evolution of a species whereby characteristics which help individual organisms to survive and reproduce are passed on to their offspring and those characteristics which do not help are not passed on is called

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that-

Process of selecting individuals with desired characters by man is called

Select the group which shares maximum number of common characters-

Which of the following scientist gave the principles of inheritance?

Assertion: Human, frog and bird have a common ancestor.
Reason: Limbs of human, bird and frog are homologous.

Assertion: Variation is high in sexually reproducing organisms compared to asexually reproducing organisms.
Reason: Inaccuracies during DNA copying give rise to variation.

An example of homologous organs is

A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as

Wild cabbage has evolved into new varieties like cabbage, broccoli and cauliflower by

The fossil remains of Archaeology is a connecting link between

What is the difference between genetic drift and change due to natural selection?

The theory of chemical evolution of life was experimentally demonstrated by-