Morphology & Anatomy of Frog (at a glance)

Morphology ovoid, slightly flattened body, generally 10-15 cm long, bilateral symmetry. skin is naked, smooth, moist and slippery (due to mucus secreted by the cutaneous glands present in skin). dorsal surface of skin is generally olive green and pigmented while...

Natural Selection

Introduction In the mid 19th century, Charles Darwin (1809 – 1882), formulated the scientific theory of evolution by natural selection, published in his book “On the origin of species” in 1859. Darwin’s idea were inspired by the observations...
Chromosomal Mutations

Chromosomal Mutations

The process that produces an alteration in DNA or chromosome’s structure or number is known as mutation. The term ‘mutation’ was coined by Hugo Marie de Vries in 1901. Any agent that cause mutation or increase the rate of mutation is known as...
Chromosome Abnormality: Down Syndrome

Chromosome Abnormality: Down Syndrome

A chromosome abnormality or a chromosomal disorder is a missing or irregular or extra portion of chromosomal DNA. usually occur when there is an error in cell division following meiosis or mitosis. are generally not inherited but occur as random events during the...
Principles of One-Gene Inheritance

Principles of One-Gene Inheritance

The study and analysis of inheritance as a result of monohybrid crosses is called one-gene inheritance. The cross between true-breeding pea plants with tall stems and dwarf stems is represent Mendel’s monohybrid crosses. When Mendel crossed true breeding tall plants...
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