c-Cbl 

adds a single ubiquitin to a given lysine of a protein

TLS Online TPP Program

#Id: 9436

#Unit 11. Evolution and Behavior

Several hypotheses explain the existence of monogamy.

1. Mate-guarding hypothesis, a male stays with a female to protect her from being fertilized by other males.

2. The male assistance hypothesis maintains that males remain with females to help them rear their offspring.

3. The female-enforced monogamy, females stop their male partners from being polygynous.

TLS Online TPP Program

#Id: 9437

#Unit 11. Evolution and Behavior

Polygamy

Polygamy is a system in which either males or females' mate with more than one partner in a breeding season.

1. In polygyny

2. In polyandry

TLS Online TPP Program

#Id: 9438

#Unit 11. Evolution and Behavior

Polygynous

In polygyny, one male mates with more than one female in a single breeding season, but females mate only with one male.

In species with male-male competition, males are often substantially larger than females, a phenomenon called sexual dimorphism.

TLS Online TPP Program

#Id: 9439

#Unit 11. Evolution and Behavior

Condition favor polygyny

Resource-based polygyny - Choosing dominant males, a female may be gaining access to good resources.

Harem mating structures - Sometimes males defend a group of females without commanding a resource - based territory. 

Ex- horses and zebras, some deer, lions, and seals.

Communal courting - In some instances, particularly in birds and mammals, males display in designated communal courting areas called leks.

TLS Online TPP Program

#Id: 9440

#Unit 11. Evolution and Behavior

Polyandrous

In polyandrous mating systems, one female mates with many males.

Honeybees are polyandrous because the queen often mates with multiple males.

TLS Online TPP Program

#Id: 9441

#Unit 11. Evolution and Behavior

Promiscuous

In promiscuous mating systems, each male or female may mate with multiple partners.

Chimpanzees, bonobos and Intertidal and terrestrial mollusks