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Reproductive Isolation Mechanisms

Speciation

what is speciation?

Hybrid infertility

what is a species ?

why reproductive isolation is important?

-The offspring can grow into a mature adult but unable to mate and have offspring of its own

Zygotic mortality

- Speciation is the process....

- A species is a group of organisms that...

No fertilized zygotes or embryos develop to maturity.

Gametic isolation

- Reproductive isolation occurs when populations cannot mate successfully with one another.

Example: reefs

post zygotic mechanisms

The sperm and egg are not compatible, so the fertilization cannot occur and the zygote will not form.

Temporal Isolation

it means 'isolated in time' , so this is a mechanism that prevents species from mating because they breed at different times like different days, seasons or even years. it happens even if species are closely related and live in the same habitat.

- Zygotic mortality

- Hybrid inviability

- Hybrid infertility

- Hybrid "break down"

Hybrid inviability

Hybrid offspring are unlikely to live long after birth.

Prezygotic Mechanisms

QUIZZZZ

-Ecological Isolation

-Temporal Isolation

-Behavioral Isolation

-Mechanical Isolation

-Gametic Isolation

1)Hybrid inviability is an example of what kind of isolation.............

a) prezygotic isolation b) postzygotic isolation

Behavioral Isolation

It includes differences in courtship behavior, differences in chemical signals or vocalizations and differences in color that allow individuals to recognize their own species.

Hybrid "break down"

Hybrids are capable of reproducing but their offspring have either reduced fertility or reduced viability.

Ecological isolation

-Individuals mate in their preferred habitat, and therefore do not meet individuals of other species with different ecological preferences.

2)When potential mates occupy overlapping ranges but reproduce at different times, this is a case of ...... isolation.

a) Ecological b) Temporal c)behavioral

Mechanical Isolation

it is when different species are isolated by their mechanics- the genitalia ofthe males and females may have different shapes or locations.

3)Reproductive isolating mechanisms _____ .

a. prevent interbreeding

b. prevent gene flow

c. reinforce genetic divergence

d. all of the above

4) Ecological isolation is an example of what kind of isolation.............

a) prezygotic isolation b) postzygotic isolation

5)When potential mates occupy overlapping ranges but their ecological needs or breeding requirements differ, this is a case of ...... isolation.

a) Ecological b) Temporal c)behavioral

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