Evidences of evolution of life
Studies and researches that are done in different fields from time to time show increasing complexities in organisms than their ancestors. These studies and evidences show many important evidences of organic evolution.
Biology
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Questions and answers on Heredity/Bio- X
1. Trait-A exists in 10% of a population of an asexually reproducing species and trait-B in 60%of the same population….
Determination of sex in living organisms
Determining male or female form of living organism through sexual reproduction is called as sex determination. Sex determination on a large scale is of two types- environmental, genetic and chromosome based.
Heredity, Its Physical Basis and Variations
Some specific characters are found in the parents of each species. These characters are transferred from generation to generation through the process of sexual reproduction.
Inheritance of Genetic Characters
Parental traits are transferred from one generation to other generation by means of chromosomes, DNA, or Genes.
Mendel’s Laws of Inheritance
On the basis of his experiments of hybridization Mendel proposed following rules of heredity-1. Law of dominance, 2. Law of iseggregation and , 3.Law of Independent Assortment.
Human Reproductive Health
The physical and mental conditions that collectively affect the reproductive capacity of a male or a female are called as reproductive health. The reproductive health is most essential for reproduction.
Population Control
Through different means – natural and unnatural the process of keeping in a limit the growth of population is called as Population Control. It is essential for the welfare of human families. This is the reason why its name has been changed to the Family Welfare.
Important Processes of Reproduction
When both the ovaries are fully mature, they alternatively produce ova at the interval of 28 days. Release of ovum into the uterus through the fallopian tube is called as ovulation.
Disasters – Natural & Man Induced
We may know that there are two types of disasters: Natural and Manmade or Human Induced Disasters. Disasters that occur…
Pollution- disruption of nutrient cycles and habitats
Our natural resources are known to have some specific qualities of their own. These qualities are known as natural qualities. It is due to specific natural qualities that different natural resources have been useful to us and to the whole biosphere. But now, the condition has changed considerably. Most of our natural resources like air, water and soil have gone bad due to pollution of different types. What is pollution?
