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327,542 Views ā¢ Mar 29, 2024 ā¢ Click to toggle off description
Scientists have discovered a group of three closely related flowers that seem to break the laws of genetics. These mountain beardtongues are pollinated by either bees or butterflies, but not both, and that's the key to an incredibly weird quirk of natural selection.
Hosted by: Hank Green (He/Him) Reid Reimers (He/Him)
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Sources:
theconversation.com/the-mystery-of-the-blue-flowerā¦
education.nationalgeographic.org/resource/speciatiā¦
www.khanacademy.org/science/ap-biology/heredity/meā¦
journals.plos.org/plosbiology/article?id=10.1371/jā¦
www.eurekalert.org/news-releases/1002279
www.sciencedirect.com/science/article/pii/S0960982ā¦
sc.edu/uofsc/posts/2021/11/professor_seeks_answersā¦
Image Sources
www.gettyimages.com/detail/photo/elfin-pink-pensteā¦
commons.wikimedia.org/wiki/File:Penstemon_virgatusā¦
.jpg#/media/File:Penstemon_virgatus_subsp._virgatus_-_Flickr_-_aspidoscelis_(1).jpg){kind=link}
www.inaturalist.org/observations/180349636
commons.wikimedia.org/wiki/File:Penstemon.barbatusā¦
www.inaturalist.org/observations/170774056
www.gettyimages.com/detail/photo/two-young-cats-roā¦
www.gettyimages.com/detail/photo/lion-panthera-leoā¦
www.gettyimages.com/detail/photo/great-dane-harleqā¦
www.gettyimages.com/detail/video/bees-flying-encouā¦
www.inaturalist.org/observations/148346363
www.gettyimages.com/detail/video/hummingbird-stretā¦
commons.wikimedia.org/wiki/File:Gregor_Mendel_2.jpā¦
www.gettyimages.com/detail/video/car-driving-in-thā¦
www.gettyimages.com/detail/video/on-my-way-to-explā¦
www.gettyimages.com/detail/video/beautiful-petuniaā¦
commons.wikimedia.org/wiki/File:Penstemon-barbatusā¦
www.gettyimages.com/detail/video/hummingbird-hoverā¦
www.inaturalist.org/observations/126401607
Views : 327,542
Genre: Education
Date of upload: Mar 29, 2024 ^^
Rating : 4.964 (131/14,534 LTDR)
RYD date created : 2024-05-12T04:37:06.659923Z
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YouTube Comments - 537 Comments
Top Comments of this video!! :3
The only immutable law of nature is that there will always be an exception to any law of nature we can define.
534 |
Mendel is not wrong. He knew full well what the limits of his theory were.
He had to assume the ideal case, because that is all he could observe with 1865's biology knowledge. Without DNA tests, he was limited to traits that he could:
1. Observe with a Mark 1 eyeball
2. That were inhereted independantly and by a single allele
The peas he grew in his garden just happened to fit both requirements for their color genes.
385 |
I just finished my honours in evolutionary biology specifically looking at taxonomy in a group of marsupials and one of the main takeaways I have is that 'species' don't really exist in an objective sense. We can define it in whatever way we like but there will always be exceptions and some degree of arbitrariness, because evolution ultimately isn't trying to create species (in the sense of discrete units of life).
169 |
1:47 Tell whoever did the art that they did a good job!
184 |
I won't put this against Mendel. The guy only had peas to work with. To cook up a whole theory that applies to the enormous number of species on earth is quite an achievement.
20 |
'Species' are just the filing system for scientists, but it seems inadequate when nature is just endless adaptation.
109 |
Genetic compatibility is ONE aspect of how a species may be described. In fact, the cat example in the video is counter to this definition, because Felis catus can have fertile offspring with Prionailurus bengalensis. Especially among plants, there are "species continuums" everywhere, in Salvia, Quercus, all over Orchidaceae etc.
86 |
āThey say great science is built on the back of giants. Not aperture science!ā
227 |
Less of a tree of life, more like a martini shaker of life.
56 |
Didn't expect to get the birds and the bees talk from hank today
7 |
Nature definitely does not like to be confined into neat little boxes, no matter how much some of humanity want it so. Dogs will breed with wolves and coyotes... Pugs and Malamutes are somehow the same species... Nature is complex and messy and I love it.
26 |
Ok..... So..... I've just spent the last 5 minutes watching the 2 bee's run into each other at 1:35. Now I have to watch the video all over again and pay attention to the flowers.
7 |
Thank you Hank for teaching us all about the birds and the bees.
Someone had to.
10 |
I heard Hank talk science today. Always a good thing
35 |
Hank: So the reds and the blues stay separate....
Me: The Bloods and Crips of the flower world.... š¤£
70 |
Re: pronunciation of "loci" -- in Latin, the letter C is always a hard consonant; it was the Roman equivalent of the Greek letter Kappa. Also, the letter I was a long vowel, pronounced like "ee" is in English. Basically, the word should be pronounced like Tom Hiddleston's most popular character.
8 |
@SciShow This the concept of a "functional locus" which can be a single QTL (Quantitative Trait Locus) region or it can be widely distributed throughout the genome. One theory of why this is so common in plants is that it is due to "paleoploidy" (or paleo-polyploidy if you prefer). Gene regions duplicate due to ancient polyploids that revert back to diploid populations with duplicate gene regions shuffled in the genome. These duplicated regions diverge over many generations due to mutation, so a plant winds up with many regions throughout the genome that are related in function but are slightly different. Polyploidy is not very common in animals (Daphnia being a notable exception) so this is perhaps not quite as common in animals, although there all other potential mechanisms. We know independent assortment is not true, that hypothesis has been utterly disproven. Chromosomes are inherreted in units. Even crossover events are not random and tend to occur in specific regions of chromosomes. This how we can define QTL regions in the first place, linkage disequalibrium can be statistically detected because regions of the genome are consistently coinhereted.
4 |
The same is true in fungi: genetics shows that many species we thought were distinct are actually single species and the taxonomy is changing constantly
4 |
Now what if they used to hybridize but the pollinator went extinct before we even realized what was going on
145 |
@daqq
1 month ago
So this was the birds and the bees talk my parents were talking about... weird.
939 |