Syntelic attachment 

Both kinetochores of a sister chromatid pair can attach to microtubules from the same pole

TLS Online TPP Program

#Id: 9425

#Unit 11. Evolution and Behavior

TLS Online TPP Program

#Id: 9426

#Unit 11. Evolution and Behavior

TLS Online TPP Program

#Id: 9427

#Unit 11. Evolution and Behavior

TLS Online TPP Program

#Id: 9428

#Unit 11. Evolution and Behavior

A- Parental investment is high in females than male

Reason - Eggs are much larger than sperm.

Females are responsible for gestation and lactation.

B - Parental investment is high in males than female - very rare

Male Mormon crickets transfer a protein-containing spermatophore to females during mating. Almost 30% of a male’s body weight is made up by the spermatophore.

C- Parental investment of males is equal to female

Degree of mate choice should be equal between the sexes.

No sexual dimorphism

Present in bird

TLS Online TPP Program

#Id: 9429

#Unit 11. Evolution and Behavior

TLS Online TPP Program

#Id: 9430

#Unit 11. Evolution and Behavior

Bateman’s principle

In most cases, it is the male’s secondary sexual traits that are exaggerated.

This shows that sexual selection is more common and intense on males than females