43570
Description
Mind Map by laurawatson_28, updated more than 1 year ago
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Created by laurawatson_28
about 11 years ago
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Sexual Dimorphism
- Primary sexual characteristics are physical
differences between the sexes such as sexual
organs
- Secondary sexual characteristics such as colours
and ornaments are differences between sexes that
are not directly involved with the mechanics of sex
- Secondary sexual characteristics such as colours
and ornaments are differences between sexes that
are not directly involved with the mechanics of sex
- Natural selection is when an individual is
selected according to its ability to survive
and reproduce
- Sexual selection is when an individual is
selected solely by its ability to obtain mates
- There is often a conflict between natural
selection and sexual selection
- There is often a conflict between natural
selection and sexual selection
- Sexual selection is when an individual is
selected solely by its ability to obtain mates
- Fisher's explanation is that selection of such traits
is a result of sexual preference; that members of
the opposite sex find a trait desirable
- This preference makes the trait advantageous,
which in turn makes having a preference for the trait
advantageous
- The process is termed "runaway", because over
time, it would facilitate the development of greater
preference and more pronounced traits
- until the costs of producing the trait balance
the reproductive benefit of possessing it
- until the costs of producing the trait balance
the reproductive benefit of possessing it
- The process is termed "runaway", because over
time, it would facilitate the development of greater
preference and more pronounced traits
- This preference makes the trait advantageous,
which in turn makes having a preference for the trait
advantageous
- Female choosiness: females
usually invest more in gametes so
will be the choosey sex
- Direct benefits of being choosey
include picking males that will
provide parental care and
resources to the female
- Direct benefits of being choosey
include picking males that will
provide parental care and
resources to the female
- Good Genes - male attractiveness is an
indication of his survivorship qualities and
reproduction potential
- Attractiveness is linked to good
genes because it takes a lot of
investment, as does fighting off
parasites etc
- Attractiveness is linked to good
genes because it takes a lot of
investment, as does fighting off
parasites etc
- Do mites lower host fitness? - Offspring from
heavily infected Barn Swallows grow slower and
less will survive
- Is resistance to mites heritable? - An infected
will have a similar parasite burden to their
father, showing it is heritable
- Resistant males are more showy because they
can allocate more resources into attractiveness
and ornamentation instead of fighting parasites
- Resistant males are more showy because they
can allocate more resources into attractiveness
and ornamentation instead of fighting parasites
- Is resistance to mites heritable? - An infected
will have a similar parasite burden to their
father, showing it is heritable
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