Sources of variability, Biology

Assignment Help:

Mutations and genetic recombination (in sexually reproducing organisms) are major sources of variations in natural populations, In this section we will briefly mention the various types of mutations, their rates and how they are caused.

The term mutation is used to designate the process by which changes arise in the genetic material and, the end products of such processes. Mritations form a separate category of sources of variability, distinct' from variability arising from genetic recombination or independent assortment of chromosomes, characteristic of sexually reproducing individuals. There are two categories of mutations. '(1) Chromosomal mutations which affect the'number of chromosomes and the number or the arrangement of gencs in a chromosome; (2) gene mutations which affect only one or a few nucleotides in a gcne. We shall now tiiscuss these two aspects of mutaion.


Related Discussions:- Sources of variability

Biological responses controlled by phytochrome, Biological Responses Contro...

Biological Responses Controlled by Phytochrome Phytochrome responses are those which are controlled reversibly by red and far-red light. These can be broadly categorised as:

Explain gluconeogenesis, Explain Gluconeogenesis Gluconeogenesis (i.e...

Explain Gluconeogenesis Gluconeogenesis (i.e synthesis of  new  glucose)  is  the  synthesis of carbohydrate from  non-carbohydrate, source. The major  substrates for glucone

Criticism of lamarckism, point out the criticism of lamarckism in any six s...

point out the criticism of lamarckism in any six short points.

Sona, characters of phylum protozoa

characters of phylum protozoa

Primate heritage, Table provides you the classification of the living prima...

Table provides you the classification of the living primates. The primate fossil history dates back to 60 million years i.e. to Paleocene times, more specifically to the cretaceous

Cracking, Cracking is the process in which large molecules are broken into ...

Cracking is the process in which large molecules are broken into smaller molecules.                      C 10 H 22         C 5 H 12 + C 5 H 10                      C 8 H

Explain nutrition assessment, Nutrition Assessment The nutritional care...

Nutrition Assessment The nutritional care process, you would realize, begins with nutritional assessment. Nutrition  assessment  is  the  evaluation  of  an individual's nutrit

What is the function of the antidiuretic hormone, Q. What is the function o...

Q. What is the function of the antidiuretic hormone? Where it made and which is the stimuli that increase or reduce its secretion? The antidiuretic hormone is secreted by the h

Define excretion of iron in human body, Define Excretion of Iron in Human B...

Define Excretion of Iron in Human Body? Our body has a limited capacity to excrete iron once it has been absorbed. Daily losses in adult man are between 0.9 to 1.05 mg. About 0

Define osseointegration and its theories, Q. Define osseointegration and it...

Q. Define osseointegration and its theories? Osseointegration implies that "it is a contact established without interposition of non bony tissue between normal remodeled bone a

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd