The Y chromosome has 60 genes that are expressed specifically in the testis.

TLS Online TPP Program

#Id: 8011

#Unit 10. Ecological Principles

                                   Richard hypothesis 

d/w = resource separation ratio.

d/w < 1, species cannot coexist;

1 < d/w < 3, there will be some competition between species

d/w > 3, species coexist harmoniously

TLS Online TPP Program

#Id: 8013

#Unit 10. Ecological Principles

                     Proportional similarity analysis

TLS Online TPP Program

#Id: 8014

#Unit 10. Ecological Principles

Proportional similarity values of less than 0.70 have been taken to indicate possible coexistence

While those greater than 0.70 indicate competitive exclusion.

TLS Online TPP Program

#Id: 8015

#Unit 10. Ecological Principles

Character displacement

Morphological differences in two closely related species present in same geographical area while similar morphology when present at different geographical are

1. Niche diversification

2. Co-existence of many species

3. Evolutionary program

TLS Online TPP Program

#Id: 8016

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 8017

#Unit 10. Ecological Principles

Ecological compression

Short term evolutionary response

More number of species coexist together

Non inheritable trait

Not change habitat but reduce the food range