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Theodosius Dobzhansky and Boris Spassky demonstrated the working of normalising selectioion a behavioural trait in two populations of Drosophida pseudobscura. The two populatiors were subject to artificial selection. One population was selected for positive phofobctic behaviour and the other negative phototactic behaviour Flies were placed in a container from where they could choose to go towards light or darkness. The photopositive flies or those that moved towards light were collected and bred, as also tljie ones which exhibited photonegative (movement away from light) behaviour. The brezding experiments were repeated for several generations and for each generation the artifical selection was maintained. At the end of several generations of artificial selection, it was observed that two distinct populations resulted, one increasingly photopositive and the other increasingly photonegative.
A hypothesis can be used to predict the outcome of future testing. Which type of hypothesis is easier to test? A. It is easier to specify and test for a difference between two outc
Define role of Lipids in Controlling Gene Expression? In the lipogenic pathway, the genes that encode the enzymes of the fatty acid synthase complex are co-ordinately expressed
Pseudorabies Pseudorabies is a viral disease caused by pseudorabies virus (PRV) that is classified under family Herpesviridae. This disease is also known as “Aujeszky’s diseas
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Explain risk factor at the global perspective in heart diease? While the risk of Cardio-vascular diseases has been found to be variable in different ethnic groups with the high
Point out Research Findings Related to Cancer Prevention? In this section we shall discuss some of the research findings related to cancer prevention. Many of the natural, canc
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notochotr is absent in the group ...........
Indicating the name and respective ploidy of each involved cell how can the formation of sperm cells from germ cells be described? The formation of sperm cells, or spermatogene
Explain the classes of biomaterials When an artificial material is placed in the human body, tissue reacts in a variety of ways depending on the material type thereby, affectin
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