Perhaps if the snakes were eating the starlings, those that had a gape big enough to eat the starlings survived while those who couldn't eat them died; hence, the mean gape increased after the starlings arrived - not that the starlings ate the snakes! 😊 Thanks for the helpful video, Nikolay 👍
Artificial selection for tetrahydrocannabinol (THC) production is carried out in a plant population. From each plant, flower THC percentage is measured and the average THC percentage per plant is regarded as the phenotype of the plant. In the population as a whole, the average THC percentage per plant is 5.8 percent. Plants whose THC percentage averages 6.2 percent are selected and mated to produce the next generation. The narrow-sense heritability of THC percentage in this population is estimated to be 20 percent (0.20). a. What is the expected average THC percentage among the plants after two generations of selection? (2 marks) b. Is this continuous improvement sustainable? Why is it unreasonable to expect continuous crop “improvement” through artificial selection? (What limits artificial selection ?) (2 marks)
The broad-sense heritability for tail length in cats is 0.7. You have a population of cats with a mean tail length of 24cm and you select for longer tails by using parents with tails that average 30cm in length. The off-spring have tails that are on average 26cm in length. What proportion of the total variance is due to dominant and epistatic interactions? Cant solve this
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This was very very helpful! Thank you :)
You're welcome! Thanks for watching.
Thanks a lot for your efforts, very helpful
You are welcome!
Perhaps if the snakes were eating the starlings, those that had a gape big enough to eat the starlings survived while those who couldn't eat them died; hence, the mean gape increased after the starlings arrived - not that the starlings ate the snakes! 😊 Thanks for the helpful video, Nikolay 👍
Thank you, you are a good teacher
You're welcome! Thanks for watching.
So easy to understand. Thank you
Artificial selection for tetrahydrocannabinol (THC) production is carried out in a plant population. From each plant, flower THC percentage is measured and the average THC percentage per plant is regarded as the phenotype of the plant. In the population as a whole, the average THC percentage per plant is 5.8 percent.
Plants whose THC percentage averages 6.2 percent are selected and mated to produce the next generation. The narrow-sense heritability of THC percentage in this population is estimated to be 20 percent (0.20).
a. What is the expected average THC percentage among the plants after two generations of selection? (2 marks)
b. Is this continuous improvement sustainable? Why is it unreasonable to expect continuous crop “improvement” through artificial selection? (What limits artificial selection ?) (2 marks)
Ok, I will make a video, but honestly - after watching this video you should be able to give all unswears yourself.
Here is a solution: th-cam.com/video/Z3W1WTmp8gk/w-d-xo.html
The broad-sense heritability for tail length in cats is 0.7. You have a population of cats with a mean
tail length of 24cm and you select for longer tails by using parents with tails that average 30cm in length.
The off-spring have tails that are on average 26cm in length. What proportion of the total variance is
due to dominant and epistatic interactions?
Cant solve this
Watch my video about mnemonic techniques: How to memorize abstract numbers th-cam.com/video/BLWK1MpE3hY/w-d-xo.html
What does the selection differential value mean . Like what does the value tell you?
The selection differential is the difference of the base population mean and the mean of the selected parents.