B-Cell Development

TLS Online TPP Program

#Id: 4308

#Unit 11. Evolution and Behavior

Haldane’s rule: hybrid sterility or hybrid inviability is often limited to the heterogametic sex. (The heterogametic sex is the one with two different sex chromosomes, while the homogametic sex has two sex chromosomes of the same type).

TLS Online TPP Program

#Id: 4309

#Unit 11. Evolution and Behavior

Hamilton’s rule: It states that an allele that causes an altruistic behavior will spread if the following condition is met (rb>C)

TLS Online TPP Program

#Id: 4310

#Unit 11. Evolution and Behavior

Cope’s rule: A proposed generalization that individual body size in animals tends to increase during evolution.

TLS Online TPP Program

#Id: 4311

#Unit 11. Evolution and Behavior

Hitchhiking: Change in the frequency of an allele due to linkage with a selected allele at another locus.

TLS Online TPP Program

#Id: 4312

#Unit 11. Evolution and Behavior

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: 4313

#Unit 11. Evolution and Behavior

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