Download App

Heredity and Evolution — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHeredity and Evolution3 Marks
Question
With the help of two suitable examples, explain why certain experiences and traits earned by people during their lifetime are not passed on to their next generations. When can such traits be passed on?
✓

Answer

He experiences and qualifications that a person earns during his/her lifetime are examples of acquired traits. These traits cannot be inherited, as they do not affect genetic makeup of an organism. In fact, these traits develop due to use and disuse of organs, or due to direct affect of environment. Thus, they are not passed on to the next generation. For example, a wrestler develops large muscles because of his training programme; it does not mean that his offspring will necessarily have large muscles. Similarly, if a lady pierces her nose, the children produced to her will not have pierced nose by birth.
Traits can be passed on to the next generation only when they have some direct effect on the genes. For example, if a mutation is caused in the germ cells of a person due to exposure to some harmful radiations, it is highly likely that the mutation caused will be passed on to the subsequent generations.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[3 Mark Questions]" from Heredity and Evolution→Heredity and Evolution — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Which of the following are concave mirrors and which convex mirrors?
Shaving mirrors, Car headlight mirror, Searchlight mirror, Driving mirror, Dentist’s inspection mirror, Torch mirror, Staircase mirror in a double-decker bus, Make-up mirror, Solar furnace mirror, Satellite TV dish, Shop security mirror.
→
Write a balanced chemical equation with state symbols for the following reactions.
  1. Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
  2. Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
→
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
→
Name the wastes which are generated in your house daily. What measures would you take for their disposal?
→
Name the functional group of organic compounds that can be hydrogenated. With the help of a suitable example, explain the process of hydrogenation, mentioning the conditions of the reaction and any one change in physical property with the formation of the product. Name any one natural source of organic compounds that are hydrogenated.
→
What is a rainbow? Draw a labelled diagram to show the formation of a rainbow.
→
On the basis of the possibilities of combination of the sex chromosomes, what percentage probability does a couple have of having a son or a daughter? Show the same by making a cross.
→
What do you understand by the term “electromagnetic induction”? Explain with the help of a diagram.
→
The electronic configuration of an element ‘X’ is 2, 8, 8, 2. To which (a) period and (b) group of the modern periodic table does ‘X’ belong? State its valency. Justify your answer in each case.
→
The electronic configurations of three elements X, Y and Z are as follows:
X 2, 4
Y 2, 1
Z 2, 1
  1. Which two elements will combine to form an ionic compound?
  2. Which two elements will react to form a covalent compound?
Give reasons for your choice.
→