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The effect of natural selection on colonies or population favouring one group in preference to other may be referred to as group selection. A group can be the smallest collection of individuals within a population or a colony. Group selection, it must be understood, is distinct from selection among individuals. The fitness of the genotypes between groups may vary within a population. The concept of altruism can be extended to groups as well. A colony consisting of many altruists has better chances of survival than a colony consisting of selfish individuals. Let us take hypothetical situatioii where individuals of a colony, reproduce indiscriminately having no regard for the carrying capacity of the environment. On the other hand, consider a colony of individuals with genes restricting population growth, utilising optimally the food sources of the environment. The selection would essentially favour the latter group and the former may eventually face extinction.
Honeybees are unusual in that male bees (drones) have only one copy of each gene, while female bees have two copies of their genes. That is because drones develop from eggs that ha
Psychotropic Drugs - Act on brain and effect its normal functioning slow down and interphere in the functioning of the nervous system. These drugs alter behaviour, consciosn
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What is the phenotype? Phenotype is every observable characteristic of a living being conditioned by its genes. A few phenotypes may be altered by nongenetic factors (for insta
AGA R - AGAR It is cell wall mucopolysaccharide of some red algae (e.g. Gelidium, Gelidiella, Gracillaria). Agar is used as culture medium, thickener, stabilizer and as lax
Q. What is the difference between translation and transcription? Transcription is the name given to the formation of DNA molecules from an open DNA chain used as a template, Tr
How can a baby become infected with (a) gonorrhoea, (b) syphilis (a) During birth, a baby might be become infected with gonorrhoea bacteria as it passes by t
Define Regulation of amino acid levels in the blood? Regulation of amino acid levels in the blood: Vitamin D helps to prevent loss of amino acids through the kidney and thus
What is biology
Trichomonas vaginalis - Protozoan This cosmopolitan protozoan lives exclusively in the female vagina and male urethra or prostate. It causes a mild disease called trichomonas
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