Question

Class 12 ISC


1)what is the lifespan of a fruit fly ?
2)Give an account of Lederberg’s replica plating experiment to show the genetic basis of evolution?
3)(a) Define phylogeny. ?
(b) What is Founder s effect? ​

Answer 1

Answer:

FIRST - 40 to 50 day

SECOND -The Lederberg's replica plating experiment provided support to Darwinism is that the adaptation in bacterial cells arose due to the selection of pre-existing mutant forms of bacteria. It is based on the fact that the pattern of colonies seen in all the replica plates was the same.

THIRD - Phylogeny, the history of the evolution of a species or group, especially in reference to lines of descent and relationships among broad groups of organisms.

FOURTH - In population genetics, the founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population. It was first fully outlined by Ernst Mayr in 1942, using existing theoretical work by those such as Sewall Wright.

Explanation:

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