Question

HELP IS NEEDED??!!

Can anyone....?

HOW CAN GENE FLOW BE A REASON WHICH CAN LEAD TO THE RISE OF NEW SPECIES??
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Answer 1

If gene is common in a species , then it can give rise to new variation of species to ensure their survial

Answer 2

Natural selection:

All populations respond to changes in their environment. Individuals will

respond in different ways depending on their genes. Those individuals whose

genes are best suited to the environment are more likely to survive and pass

on their genes to the next generation. This is natural selection. Gradually,

favourable genes will start to predominate in the population and less

favourable genes will decline.

Genetic drift:

It is caused by drastic changes in the frequencies of particular genes by

chance alone. Genetic drift with changes in the gene flow imposed by

isolation mechanism acts as an agent of speciation which ultimately results in

evolution.

Geographical isolation:

Geographical isolation is caused by various types of barriers such as

mountain ranges, rivers and seas. It leads to reproductive isolation due to

which there is no flow of genes between separated groups of population

which ultimately results in speciation.