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TLS Online TPP Program

#Id: 4740

The founder cell (AB) divides equatorially, while the P1 cell divides meridionally (transversely) to produce another founder cell (EMS) and a posterior stem cell (P2).


#Unit 5. Developmental Biology #Vulva formation in Caenorhabditis elegans #Part B Pointers
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TLS Online TPP Program

#Id: 2254

#Unit 11. Evolution and Behavior

Frequency-dependent selection,
1.    Positive frequency
2.    Negative frequency
TLS Online TPP Program

#Id: 2255

#Unit 11. Evolution and Behavior

There are three basic modes of selection on a quantitative trait.
TLS Online TPP Program

#Id: 2256

#Unit 11. Evolution and Behavior

Overdominance, the heterozygote has higher fitness than the  fitness of the two homozygotes.
TLS Online TPP Program

#Id: 2257

#Unit 11. Evolution and Behavior

Underdominance, in which the heterozygote has lower fitness than both homozygotes.
TLS Online TPP Program

#Id: 2258

#Unit 11. Evolution and Behavior

Directional selection leads to fixation of the favored allele and elimination of the other allele.
TLS Online TPP Program

#Id: 2259

#Unit 11. Evolution and Behavior

Directional selection favors individuals at one extreme of a phenotypic distribution that have greater reproductive success in a particular environment.