Can you identify the reproductive barrier illustrated by each example? Example T
ID: 302415 • Letter: C
Question
Can you identify the reproductive barrier illustrated by each example?
Example Type of evidence 1. Some closely related species of snails cannot mate because their shells spiral in opposite directions, making it impossible for their reproductive organs to be aligned 2. Although some closely related (but separate) species of salamander can mate gametic incompatibility with each other to produce offspring, the offspring fail to develop normally and cannot reproduce behavioral isolation 3. In North America, one species of garter snake lives primarily in the water, while another species lives primarily on land. Therefore, they rarely meet and mate. mechanical incompatibility 4. Certain species of plants require hummingbirds to transfer pollen from the male parts of one flower to the female parts of another flower. The shape of the plant flower is compatible only with the one species of hummingbird that transfers its pollen habitat isolation 5. In the Galapagos Islands, birds called blue-footed boobies will mate only after hybrid weakness a specific "dance" is performed where a potential mate displays bright blue feet. 6. Within the open ocean, many species of sea slug release gametes simultaneously, but eggs of each species cannot be fertilized by sperm of a different species 7. Male firefies signal to females of the same species by blinking their tail lights at a particular rhythm. Females only respond to signals sent by males of their speciesExplanation / Answer
1. The situation in which two organisms cannot mate because their reproductive organs do not fit each other as they are supposed to is known as mechanical incompatibility. Thus, this is a case of mechanical incompatibility.
2. Members of closely related species are often capable of mating, but the offspring produced in such cases is either infertile or unbale to survive and dies soon after its birth. Thus, this is a case of hybrid weakness.
3. The two species in this case are physically separated and unable to mate because they live in different areas. Thus, this is a case of habitat isolation.
4. This is a case of mechanical incompatibility because the flower has adapted to change its shape in such a way that only a particular species of humming bird is able to enter it and collect nectar and pollen.
5. This is an example of behavioural isolation because the male displays a particular behaviour (a dance) which attracts the females of a particular species only.
6. The gametes of a particular species are compatible with that species only and cannot fertilize or get fertilized by the gametes of another species. This is known as gametic incompatibility.
7. This is an example of behavioural isolation because the males of a particular species blink their tails in a particular pattern which can only attract the females of the same species.