3 isoforms of actin-

α - expressed only in muscle cells

β and γ - found together in almost all non-muscle cells

TLS Online TPP Program

#Id: 9569

#XL - T Zoology

Dollo’s law:  A biological generalization positing that complex characters, once lost in evolution, are extremely unlikely to reappear and thus the loss of complex characters is virtually always irreversible.

TLS Online TPP Program

#Id: 9570

#XL - T Zoology

Van Valen law -  he found a surprising result: rather straight curves, implying that the probability of extinction is roughly constant.

TLS Online TPP Program

#Id: 9571

#XL - T Zoology

Ockham’s principle - Principle of parsimony

TLS Online TPP Program

#Id: 9572

#XL - T Zoology

The Forces of Evolution

Mutation, 

Genetic drift

Gene flow or migration

Selection

TLS Online TPP Program

#Id: 7337

#XL - T Zoology

TLS Online TPP Program

#Id: 7338

#XL - T Zoology

Nonrandom Mating Nonrandom mating affects the way in which alleles combine to form genotypes and alters the genotypic frequencies of a population.