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We hinted at it before, but here's the whole story: most plants have their sexual organs all in one flower, so that the pollen (think plant sperm) can fall into or onto the stigma, which is a sticky bit at the top of the female reproductive parts. The stigma catches the pollen and starts it on the journey to fertilizing the ovules. Others—like avocados—have some male flowers and some female flowers on the same plant, or have male versus female plant individuals. But avocados go ahead and make it more complicated by only opening one type of flower at a time. Type A plants start off female in the morning, and type B are female in the afternoon (and of course vice versa for their male periods).
Pollinators can still fertilize avocados—they just have to do it over the course of two days rather than minutes or hours. That's not generally good enough for avocado farmers, though. You may only see Hass avocados in stores, but in the orchard, they're grown alongside B cultivars. Hass avocados are an A type themselves, which means the flowers are complimentary—you always have male and female open at the same time, just on different trees. This helps the avocado trees to be more productive, even if there's just a smattering of B types mixed in with the Hass varieties. You can sometimes find them at a farmer's market with weird names like Bacon, Walter Hole, and Fuerte.
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Pollinators can still fertilize avocados—they just have to do it over the course of two days rather than minutes or hours. That's not generally good enough for avocado farmers, though. You may only see Hass avocados in stores, but in the orchard, they're grown alongside B cultivars. Hass avocados are an A type themselves, which means the flowers are complimentary—you always have male and female open at the same time, just on different trees. This helps the avocado trees to be more productive, even if there's just a smattering of B types mixed in with the Hass varieties. You can sometimes find them at a farmer's market with weird names like Bacon, Walter Hole, and Fuerte.
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That's because clownfish have a female-dominated society, where the most aggressive female only mates with one male in her little group. When she dies, the breeding male takes her place, and one of the juvenile males goes through a growth spurt to take that vacant spot as consort. Most sequentially hermaphroditic fish start off female and work in the other direction, so clownfish are part of the minority here.
Why bother with this strange conga line of shifting sexes? For one, it massively reduces competition between males. In general, though, biologists aren't always sure why sequential hermaphroditism evolves. It seems to be evolutionarily helpful to some species, but it's clearly not so helpful that everyone evolved this way.
Whatever the reason, know that the eventual remake of Finding Nemo should include Marlin's sexual transition at the beginning of the film. In fact, a lot of those fish should have gone through sex changes. Roughly 500 species of fish are sequentially hermaphroditic, from groupers to wrasses.
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Why bother with this strange conga line of shifting sexes? For one, it massively reduces competition between males. In general, though, biologists aren't always sure why sequential hermaphroditism evolves. It seems to be evolutionarily helpful to some species, but it's clearly not so helpful that everyone evolved this way.
Whatever the reason, know that the eventual remake of Finding Nemo should include Marlin's sexual transition at the beginning of the film. In fact, a lot of those fish should have gone through sex changes. Roughly 500 species of fish are sequentially hermaphroditic, from groupers to wrasses.
Play bazaar Satta King
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