Question

1. Population is not used in describing species. Population is a group of organisms of the same species populating a given area, a group of individuals of the same species that live in the same area and interbreed, producing fertile offspring. Interbreeding, sexual reproduction, natural selection and color are used in describing species. Individuals in an interbreeding population share in a common gene pool. My question is can you tell me how interbreeding, sexual reproduction, natural selection and color are used in describing species?

2. The convergence in external morphology of sharks, penguins, and porpoises is attributed to selection pressures that are common to these groups. Such as favorable enrionment or ability to swim. The prey for these species are also swimmers and so to ensure their survival they have to exhibit the morphology that will enable them get their food. This is not due to reduced genetic variability in these groups, reproductive isolation of these groups, or identical genes in all three groups. I know that by reading the options and know slection pressures is the answer but don't know why the others could not be. Can you explain it?

3. During RECENT epoch does a major extinction event begin. The major extinctions took place in "recent" time/era because of humans are the most complex and evolved species on earth which is the most common cause of extinction. Can you tell me why the answer would not be: Eocene, Oligocene, Miocene, and Pleistocene ?

Answer 1

Ans-1 the interbreeding, sexual reproduction, natural selection and color are used for description of the species because interbreeding occur between the organisms of the two population having same type of morphology and gene pool.

Sexual reproduction is used because mating will be between the same type of organisms i.e. which share same species. Sexual reproduction is always intraspecific.

Natural selection help in gaining some specific some specific traits which are required by that species to survive efficiently in specific geographical region, so the natural selection for the same species living in the same region will be similar to each other that's why it can be used for description of the species.