reproductive isolation worksheet
use the options below to identify which isolating mechanism is being described.
temporal isolation behavioral isolation geographic isolation
hybrid inviability hybrid infertility

| example | type of reproductive isolation | explanation |
| --- | --- | --- |
| four circus wolves escape on long island. they establish a small, viable population, coexisting with humans in a partly suburban environment. the population is isolated from other wolves. | | |
| females of the species drosophila pseudoobscura (fruit flies) respond less well to courtship signals from males of their close relative d. persimilis than they do to those of males of their own species. | | |
| when a lion and a tiger breed they create a hybrid known as a liger. this offspring cannot reproduce with another liger. | | |
| in some species of irises, the pollination of one iris from the other plant will never result in a seed that can later become a plant because the embryo dies. | | |
| despite inhabiting overlapping ranges, the western spotted skunk and the eastern spotted skunk do not interbreed. one reason for this lack of interbreeding is that the western species breeds in early fall and the eastern species breeds in late winter to early spring. | | |

Question

reproductive isolation worksheet
use the options below to identify which isolating mechanism is being described.
temporal isolation  behavioral isolation  geographic isolation
hybrid inviability  hybrid infertility

| example | type of reproductive isolation | explanation |
| --- | --- | --- |
| four circus wolves escape on long island. they establish a small, viable population, coexisting with humans in a partly suburban environment. the population is isolated from other wolves. |  |  |
| females of the species drosophila pseudoobscura (fruit flies) respond less well to courtship signals from males of their close relative d. persimilis than they do to those of males of their own species. |  |  |
| when a lion and a tiger breed they create a hybrid known as a liger. this offspring cannot reproduce with another liger. |  |  |
| in some species of irises, the pollination of one iris from the other plant will never result in a seed that can later become a plant because the embryo dies. |  |  |
| despite inhabiting overlapping ranges, the western spotted skunk and the eastern spotted skunk do not interbreed. one reason for this lack of interbreeding is that the western species breeds in early fall and the eastern species breeds in late winter to early spring. |  |  |

Accepted Answer

### First Example (Circus Wolves)
# Brief Explanations:
The wolves are separated from other wolf populations by their location (Long Island, suburban environment), so this is Geographic Isolation. The explanation is that the physical location (geography) keeps them isolated from other wolf groups.
# Answer:
Type of Reproductive Isolation: Geographic Isolation
Explanation: The wolf population is isolated from other wolves due to their geographic location (Long Island, suburban area), preventing interbreeding with other wolf groups.

### Second Example (Fruit Flies)
# Brief Explanations:
Females respond less to courtship signals of a related species, which is about mating behaviors. So this is Behavioral Isolation. The explanation is that differences in courtship behavior (a behavioral trait) prevent mating between the species.
# Answer:
Type of Reproductive Isolation: Behavioral Isolation
Explanation: Female fruit flies of *Drosophila pseudoobscura* show reduced response to courtship signals from males of the related species *D. persimilis* (due to behavioral differences in courtship), leading to reproductive isolation.

### Third Example (Lion - Tiger Hybrid)
# Brief Explanations:
The liger (hybrid) cannot reproduce, which fits Hybrid Infertility. The explanation is that the hybrid offspring (liger) is infertile, so it can't produce offspring with another liger.
# Answer:
Type of Reproductive Isolation: Hybrid Infertility
Explanation: The hybrid offspring (liger) produced by a lion and a tiger is infertile (cannot reproduce with another liger), so this is hybrid infertility.

### Fourth Example (Irises)
# Brief Explanations:
The embryo of the hybrid seed dies, so the hybrid is not viable. This is Hybrid Inviability. The explanation is that the hybrid embryo (from pollination between different iris species) dies, so a viable plant never develops.
# Answer:
Type of Reproductive Isolation: Hybrid Inviability
Explanation: Pollination between different iris species results in a seed with an embryo that dies, so the hybrid (seed - to - plant) is not viable, which is hybrid inviability.

### Fifth Example (Spotted Skunks)
# Brief Explanations:
The skunks breed at different times (western in fall, eastern in winter/spring), so this is Temporal Isolation. The explanation is that differences in breeding time (temporal factor) prevent interbreeding between the two skunk species.
# Answer:
Type of Reproductive Isolation: Temporal Isolation
Explanation: The western spotted skunk breeds in early fall and the eastern spotted skunk breeds in late winter to early spring. Their different breeding times (temporal difference) prevent interbreeding, so this is temporal isolation.

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QUESTION IMAGE

Question

Explanation:

First Example (Circus Wolves)

Second Example (Fruit Flies)

Answer:

example	type of reproductive isolation	explanation
females of the species drosophila pseudoobscura (fruit flies) respond less well to courtship signals from males of their close relative d. persimilis than they do to those of males of their own species.
when a lion and a tiger breed they create a hybrid known as a liger. this offspring cannot reproduce with another liger.
in some species of irises, the pollination of one iris from the other plant will never result in a seed that can later become a plant because the embryo dies.
despite inhabiting overlapping ranges, the western spotted skunk and the eastern spotted skunk do not interbreed. one reason for this lack of interbreeding is that the western species breeds in early fall and the eastern species breeds in late winter to early spring.