Q23 of 30 Page 1

According the Darwinian theory, the rate of appearance of new forms is linked to their life cycles. Explain.

• Microbes have a short life span.


• Therefore they divide very fast and they have the ability to multiply and become millions of individuals within hours.


• Because of the short life span, it is easy to see variations in population.


• But in a higher organism, the life span is long, hence variations are not visible fast.


More from this chapter

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21

Morgan carried out several dihybrid crosses in Drosophila and found F2-ratios deviated very significantly from the expected Mendelian ratio. Explain his findings with the help of an example.

 22

With the help of a schematic diagram, explain the location and the role of the following in a transcription unit:

Promoter, Structural gene, Terminator.


 24

Draw a labelled sketch of a typical biogas plant.

OR


(a) Name the causative organisms for the following diseases:


(i) Elephantiasis


(ii) Ringworm


(iii) Amoebiasis


(b) How can public hygiene help control such diseases?


 25

Following a severe accident, many charred-disfigured bodies are recoveredfrom the site making the identification of the dead very difficult. Name and explain the technique that would help the authorities to establish the identity of the dead to be able to hand over the dead to their respective relatives.