Heredity and Evolution | CBSE Class 10 Science

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HEREDITY
The most obvious outcome of the reproductive process still remains the generation of individuals of similar design. The rules of heredity determine the process by which traits and characteristics are reliably inherited. Let us take a closer look at these rules.

Inherited Traits
What exactly do we mean by similarities and differences? We know that a child bears all the basic features of a human being. However, it does not look exactly like its parents, and human populations show a great deal of variation.

EVOLUTION
We have noted that there is an inbuilt tendency to variation during reproduction, both because of errors in DNA copying, and as a result of sexual reproduction. Let us now look at some consequences of this tendency.
Evolution is the sequence of gradual changes that take place in primitive organisms, over millions of years, in which new species are produced.

Gregor Mendel – The Father of Genetics
Acquiring characteristics or traits from one generation to the other is nothing but inheritance. Here, both parents contribute equally to the inheritance of traits.
It was Gregor Mendel, known as the Father of Genetics, who conducted immense research and studied this inheritance of traits.

Rules of Inheritance
Gregor Johann Mendel was a scientist who is recognized as the Father and Founder of genetics. Mendel conducted many experiments on the pea plant (Pisum sativum) between 1856 and 1863.
He studied the results of the experiments and deducted many observations. Thus, laws of inheritance or Mendel’s laws of inheritance came into existence.

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