南通通报春运交通安全情况 查纠违法逾70万起
百度 目前，被海信收购的这家东芝子公司还有很大的亏损，周厚健希望今年就通过一些改革和措施扭转乾坤，实现盈利。
Changes in the heritable attributes of populations of organisms over time. The mechanisms of evolution are mutation, migration, drift, and selection.
40 questions from the last 365 days
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Confusion in concept of dominance and incomplete dominance
According to my textbook(NCERT)- out of two alleles one of them undergoes some changes(mutations I suppose) that leads to it making a normal/less efficient enzyme, a non functional enzyme or no enzyme ...
- 101
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1
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29
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Endogenous retroviruses questions
What is the randomness of MLV retroviruses?
How bias is it and what are the chances for it to invade the same base pair as another individual?
I understand HIV1 has a 1 in 10 million or much higher ...
2
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0
answers
103
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Seedless as a derived characteristic of plants
In my exam, I got the following question which confused me:
Which of the following is NOT a derived characteristic of plants?
a. seedless
b. vascular tissue
c. flowers
d. seeds
e. all of the above ...
- 21
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0
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50
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Does more evolutionary time result in a healthier population?
A lot of people ask why a particular human condition still exists if it's maladaptive to reproductive success (it should have been weeded out). And the answer all the time is that if the individual ...
- 255
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1
answer
81
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What does it mean for an organ to be related, by descent, to another organ?
I am reading a book by philosopher Justin Garson called What Biological Functions Are and Why They Matter and he is defending an etiological account of biological function, a selected effect theory, ...
- 127
1
vote
1
answer
134
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Book recommendations on animal evolution
I am very interested in learning the evolutionary history of all kinds of modern animals like whales, bears, tigers and gorillas, starting from an unicellular organism. Is there any book that covers ...
- 121
1
vote
1
answer
66
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How does sequential hermaphroditism evolve?
sequential hermaphroditism is the process of changing one’s biological gender. I’m just curious how this evolved. I understand why it evolved but how did this evolve? Evolution is a gradual process, ...
- 283
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3
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3k
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How did snakes lose their legs?
I understand the why, but how did snakes lose legs completely? In most other cases they become very small but still there (whale back legs, fly secondary wings, kiwi wings, etc.) but they almost never ...
- 283
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61
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Difference between Modern Synthesis and Gene Centric View of Evolution
Modern Synthesis was a synthesis between Darwin's model of evolution through natural selection and Mendel's discovery of particulate inheritance, correcting Darwin's false assumptions about ...
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1
answer
83
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Does the tail of an Indian spiny-tailed lizard detach while threatened like other lizards?
Indian spiny-tailed lizards (Saara hardwickii) have an evolutionary trait to store excess fat in their tails.
This makes me wonder whether they shed / detach their tail while being hunted like other ...
5
votes
1
answer
147
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Dog domestication timeline?
Full disclosure: not a biologist, I am pretty much a noobie when it comes to biology.
I was shocked to find out that the domestication of dogs is believed really to have only taken around 40,000 years....
1
vote
1
answer
68
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Sexual vs Asexual reproduction
Why is sexual reproduction so common among multicellular organisms, when asexual reproduction seems like a more straightforward way to reproduce?
Asexual doesn’t require the energy & risk involved ...
- 13
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0
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28
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How can I make a good gene tree based on multiple genes from multiple gene families (in IQTREE or otherwise)?
I am trying to generate a gene tree, based on several genes in several species, all grouped by being in broadly one gene family.
Specifically, I am looking at about 30 heat shock proteins in C. ...
0
votes
1
answer
57
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How does evolution select for higher mutation rates in viruses (e.g. HIV)?
I've recently become interested in the evolution of the HIV virus. From what I understand, the high mutation rate of the HIV genome is beneficial, since this makes the host unable to develop any kind ...
- 45
2
votes
1
answer
266
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"Leaf" with legs and eyes - species identification, and mechanisms underlying its leaf-like appearance
Attached to the green wall of a tunnel walkway on a cold February morning in northern Taiwan a ~3 cm long, brown "leaf" caught my eye. Upon closer inspection and telephone photography, I ...
- 5,506