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Cell structure and function
All organisms, whether simple or complex, plants or animals. are composed of cells. For example, a bacterium or an amoeba is made up of just one cell, while a complex organism like an adult human is composed of hundreds of billions of cells (over 1014 cells). The sum total of the properties of cells in an organism is represented by its appearance, behaviour, activities and functions. It becomes thus, important to study cells for understanding all forms of life.
What is the meaning of Darwin's expression "descent with modification"? Descent with modification refers to natural selection. Descent with modification refers to evolutionary chan
Which is the type of gamete produced by a heterozygous individual? What is the genotypical proportion of these gametes? Heterozygous individuals, for instance, AA, produce two
How did Alfred Hershey and Martha chase arrive at the conclusion that DNA is the Genetic material?
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Q. From which germ layer do the epidermis and the nervous system originate? What are other organs and tissues made from that germ layer? Epidermis and nervous system have the s
In this section, we shall discuss a classic example of natulal selection in action. In the preceding unit, it was stated that natural selection always aims at eliminating alleles,
what is the prevailing wind direction in equatorial regions affected by the trade winds? a) The wind blows from east to west b) the wind blows from west to east
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