Sources of variability, Biology

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.

Posted Date: 4/6/2013 1:12:03 AM | Location : United States







Related Discussions:- Sources of variability, Assignment Help, Ask Question on Sources of variability, Get Answer, Expert's Help, Sources of variability Discussions

Write discussion on Sources of variability
Your posts are moderated
Related Questions
????? # 100 ??????????? #Minimum ?????? ?????

Explain the systemic antibiotic cover The need for  systemic antibiotic cover should be considered. The original protocols recommended an antibiotic such as amoxicillin 250 mg

R in d e rp es t It is also known as cattle plague resulting in high fever, diarrhoea and high mortality rates. In year 2006, OIE has declared that India is free from rin

CRANIAL NERVES 12 pairs. Total weight 12 gms. Upto amphibian 10 pairs cranial nerves are present. 1, 2, 8, - sensory. 3, 4, 6, 11, 12, motor. 5, 7, 9, 10 - mixed. 3

Define Casein - Tests for Presence of Exoenzymatic Activity? Casein is a major milk protein composed of various amino acids linked through peptide bonds. Extra-cellular enzyme

“Define nosocomial infections. Discuss the factors that might influence whether a patient may acquire nosocomial infection. How might these risks be reduced?”

The bacteria that cause dental cavities in humans break down sugars, releasing what chemical which causes tooth destruction? a) Acids b) Bases c) Enzymes d) Monosaccha

Q. Dietary tips for hyperlipideinic patients? It is important to note here that the dietary modifications need to be individual in each patient and these should be tailored lo


Determine the Preservation Changes While Cooking? While cooking, two preservation changes (at least) occur which include: 1.  Destruction or reduction of microorganisms 2