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TLS Online TPP Program

#Id: 2257

Underdominance, in which the heterozygote has lower fitness than both homozygotes.

#Unit 11. Evolution and Behavior #Rate of change in gene frequency through natural selection #Part B Pointers
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TLS Online TPP Program

#Id: 2026

#Unit 8. Inheritance Biology

Plasmid Small, circular DNA molecule found in bacterial cells that is capable of replicating independently from the bacterial chromosome.
TLS Online TPP Program

#Id: 7679

#Unit 1. Molecules and their Interaction Relevant to Biology

Because they cannot rotate, each peptide bond holds 6 atoms in a plane.

However, most possible angles of Phi (φ) and Psi (ψ) are impossible due to clashes

between atoms. These balls are much smaller than the atoms they represent.
TLS Online TPP Program

#Id: 5330

#Unit 7. System Physiology – Animal

Rapid Ventricular Filling
The rapid flow of blood from the atria to the ventricles produces the third heart sound (S3).
TLS Online TPP Program

#Id: 9178

#Unit 11. Evolution and Behavior

Fitness 
Fitness is defined as the relative reproductive success of one genotype compared with other genotypes in the population
TLS Online TPP Program

#Id: 7371

#Unit 5. Developmental Biology

The transcription factors encoded by the pair-rule genes activate the segment polarity genes, whose mRNA and protein products divide the embryo into 14-segment-wide units, establishing the periodicity of the embryo.