Sexual selection is a form of natural selection where one sex chooses mates based on specific traits or competes within the same sex for mating opportunities. It includes intersexual selection, where preferences are observed between genders, and intrasexual selection, which involves competition among the same gender. This concept also applies to humans, influencing mating choices and anatomical features as a means to enhance reproductive success.

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