There are four known forces that are involved in evolution:

1)mutation,

2) genetic drift

3) gene flow or migration

4) selection.

TLS Online TPP Program

#Id: 7421

#Unit 5. Developmental Biology

when flies have a mutation wherein the Antennapedia gene is expressed in the head (as well as in the thorax), legs rather than antennae grow out of the head sockets

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#Id: 824

#Unit 4. Cell Communication and Cell Signaling

ETI are usually stronger than PTI and cause hypersensitive reaction or apoptosis of tissue

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#Id: 399

#Unit 2. Cellular Organization

Variants have been identified for all core histones except histone H4.

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#Id: 5188

#Unit 7. System Physiology – Animal

The initial reaction in the intrinsic system is conversion of inactive factor XII to active factor XII (XIIa).

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#Id: 3634

#Unit 3. Fundamental Processes

When inosine (I) is the first (wobble) nucleotide of an anticodon, three different codons can be recognized—the maximum number for any tRNA.