The variation/difference in the off springs of a species from their parents constitutes an important component of
- genetics
- speciation
- species fixation
- heredity
The Correct Option is B
Solution and Explanation
Top Questions on Principles of Inheritance and Variation
- If there were 100 rose plants in a garden last year. 20 new rose plants are added through reproduction in current year. the birth rate of rose is ____ offspring per rose per year.
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Which of the following statements are correct about Klinefelter’s Syndrome?
A. This disorder was first described by Langdon Down (1866).
B. Such an individual has overall masculine development. However, the feminine development is also expressed.
C. The affected individual is short statured.
D. Physical, psychomotor and metal development is retarded. E. Such individuals are sterile.Choose the correct answer from the options given below:
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Questions Asked in NEET exam
- A chemical reaction proceeds into the following steps Step I,$\hspace15mm 2A \rightleftharpoons X$ fast Step II,$\hspace10mm X + B \rightleftharpoons Y$ slow Step III,$\hspace10mm Y + B \rightleftharpoons $ Product fast The law for the overall reaction is
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- Chemical Kinetics
- A solution is $0.1 M$ with respect to $Ag ^{+}, Ca ^{2+}, Mg ^{2+}$ and $Al ^{3+}$, which will precipitate at lowest concentration of $\left[ PO _{4}^{3-}\right]$ when solution of $Na _{3} PO _{4}$ is added?
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- Equilibrium
- How many $ 1\,\mu F $ capacitors must be connected in parallel to store a charge of $1\, C$ with a potential of $110\, V$ across the capacitors?
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- electrostatic potential and capacitance
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Concepts Used:
Principles of Inheritance and Variation - Mutation
A Mutation is a change in the sequence of our DNA base pairs caused by numerous environmental stimuli such as UV light or mistakes during DNA replication. Germline mutations take place in the eggs and sperm and can be passed onto offspring, whereas somatic mutations take place in body cells and are not passed on.
Types of Mutations
There are three types of mutations, which are as follows:
Silent mutation
It refers to any change in DNA sequence that has no effect on the amino acid sequence in a protein or the functions that a protein performs. There is no phenotypic indication that a mutation has occurred.
Nonsense mutation
When there is a change in the sequence of base pairs due to a point mutation, that results in a stop codon. This leads to a protein that is either shortened or non-functional.
Missense mutation
A missense mutation occurs when a point mutation causes a change in the codon, which then codes for another amino acid.
The mutation is caused by the following factors:
Internal Causes
When DNA copies incorrectly, the majority of mutations occur. Evolution occurs as a result of all of these mutations. DNA makes a copy of itself during cell division. When a copy of DNA isn't flawless, it's called a mutation since it differs somewhat from the original DNA.
External Causes
When certain chemicals or radiations are used to break down DNA, it causes the DNA to break down. The thymine dimers are broken by UV radiation, resulting in altered DNA.
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