Catkin

Examples:

Morus alba (mulberry), Betula (birches), Qercus (oaks), Salix (willows), etc.

TLS Online TPP Program

#Id: 9200

#XL - T Zoology

1. Resistant to pesticide in insect

2. Antibiotic resistant in pathogen

3. Industrial melanism

TLS Online TPP Program

#Id: 9201

#XL - T Zoology

TLS Online TPP Program

#Id: 9202

#XL - T Zoology

Disruptive Natural selection

Disruptive selection favors the survival of individuals at both extremes of a range, rather than the  intermediate.

Increase variance in the population because select those phenotype which are away from mean.

It maintain balance polymorphism and maximum selection coefficient value.

TLS Online TPP Program

#Id: 9203

#XL - T Zoology

Balance natural selection

Balancing selection is a type of natural selection that maintains genetic diversity in a population.

In balancing selection, two or more alleles are kept in balance, and therefore are  maintained in a population over the course of many generations.

TLS Online TPP Program

#Id: 9204

#XL - T Zoology

Evolution by natural selection occurs if variation must lead by Ecotypes. 

Ecophene is not be selected by natural selection

TLS Online TPP Program

#Id: 9205

#XL - T Zoology

Change in environmental condition is not necessary for natural selection.