Class 10 Science - Chapter Heredity and Evolution NCERT Solutions | Give the basic features of the mechanism
Give the basic features of the mechanism of inheritance.
Transfer of genetic characters from individuals of one generation to those of a future generation through genetic descendants is known as heredity or inheritance.
Basic features of the mechanism of inheritance are as follows:-
1. Each character or trait is controlled by the pair of alleles.
2. In an organism having two alleles for the given trait, one is dominant (that expresses itself) and other is recessive (that may remain unexpressed), also defined as the law of dominance.
3. The two alleles of the trait get separated during the gametogenesis so that each gamete cell receives only one allele of each trait, and is defined as the law of segregation.
4. Each allele is transferred from one generation to another and remains unchanged.
5. Genes control the characters and are present on the chromosomes.
6. Two different forms of the gene will get separate at the time of gamete formation and are brought together in zygote.
More Questions From Class 10 Science - Chapter Heredity and Evolution
- Q:-
Outline a project which aims to find the dominant coat colour in dogs.
- Q:-
How is the sex of the child determined in human beings?
- Q:-
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
- Q:-
How do Mendel’s experiments show that traits are inherited independently?
- Q:-
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
- Q:-
Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?
- Q:-
Explain the terms analogous and homologous organs with examples.
- Q:-
How do Mendel’s experiments show that traits may be dominant or recessive?
- Q:-
How does the creation of variations in a species promote survival?
- Q:-
Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
Popular Questions of Class 10 Science
- Q:-
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
- Q:-
What is a good source of energy?
- Q:-
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
- Q:-
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
- Q:-
What changes can you make in your habits to become more environment-friendly?
- Q:-
What is the difference between a reflex action and walking?
- Q:-
What is the importance of DNA copying in reproduction?
- Q:-
Why should a magnesium ribbon be cleared before burning in air?
- Q:-
Define the principal focus of a concave mirror.
- Q:-
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
Recently Viewed Questions of Class 10 Science
- Q:-
What are the components of the transport system in highly organised plants?
- Q:-
Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.
- Q:-
What is the function of an earth wire? Why is it necessary to earth metallic appliances?
- Q:-
When does an electric short circuit occur?
- Q:-
Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?
- Q:-
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
- Q:-
State the rule to determine the direction of a (i) magnetic field produced around a straight conductor-carrying current, (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and (iii) current induced in a coil due to its rotation in a magnetic field.
- Q:-
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
- Q:-
Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.
- Q:-
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
- All Chapters Of Class 10 Science
- All Subjects Of Class 10