Sexual selection

This ppt is on the sexual selection which includes the definition of sexual selection, its purpose, types and their explanation, and bibliography.

1. Sexual selection

2. WHAT IS SEXUAL SELECTION? It is a type of natural selection in which the sexes acquire distinct forms either because the members of one sex choose mates with particular features or because in the competition for mates among the members of one sex only those with certain traits succeed.

3. PURPOSE OF SEXUAL SELECTION Better survival chances for offspring Weaker genes are eliminated not chosen to reproduce Produce offspring

4. TYPES OF SEXUAL SELECTION The two basic types of sexual selection are INTERSEXUAL SELECTION(between sex) INTRASEXUAL SELECTION(within sex )

5. WHAT IS INTERSEXUAL SELECTION? This type of selection occurs in between two gender i.e. it can be male or be female. Suppose there is group of male and female has to select one of male its INTERSEXUAL SELECTION and in such case multiple character are observed like:- Colorful tail of Peacock Antler of Dear Bands on Tiger Mane in Lion

6. INTERSEXUAL SELECTION MATE CHOICE Mate selection depends on the attractiveness of its trait. Traits related to resource holding potential and nobility. SEXUAL CONFLICT Males and females prefer different reproductive strategies to reach optimal fitness. Strategies include frequency of mating frequency and parental care.

7. WHAT IS INTRASEXUAL SELECTION? This means Selection of Candidate within same Gender i.e. Suppose there is group of male they will choose one candidate and let him go for mating with female. This type of selection involves:- Direct fight in same gender (Northern elephant seals). or Direct competition

8. INTRASEXUAL SELECTION Males Status Power Wealth Resource holding potential- the ability of an animal to win an all out fight if one were to take place. Females Youth Health Availability Nubility - sexually attractive young female, suitable for mating with high reproductive capacity.

9. SEXUAL DIMORPHISM The differences in male and female of the same species. males often have more deleterious characters(characteristics that reduce survival chances.

10. EVOLUTION Anagenesis occurs due to female choices ( changes that occur within a species overtime). Sensory exploitation – harmful characteristics evolve in males to attract female(fulfil reproductive needs) i.e long ,bright colour tails etc.

11. SEXUAL SELECTION IN HUMANS Sexual selection in humans concerns the concept of sexual selection , introduced by Charles Darwin as an element of his theory of natural selection , as it affects humans . Sexual selection is a biological way one sex chooses a mate for the best reproductive success. Most compete with others of the same sex for the best mate to contribute their genome for future generations.

12. SEXUAL SELECTION QUALITIES IN HUMANS The theory of sexual selection has been used to explain a number of human anatomical features. These include rounded breasts, facial hair, pubic hair and penis size. The breasts of primates are flat, yet are able to produce sufficient milk for feeding their young .

13. BIBLIOGRAPHY Guided by teacher Books Wikipedia.org Serpentfd.org Edge.org

14. Thank you