Hi I really need some help my teacher told me to redo my last 3 questions
1.
Expl...
Hi I really need some help my teacher told me to redo my last 3 questions
1.
Explain what it means for a section of DNA to be considered a molecular clock. Be sure to discuss the importance of neutral mutations in this measure of time.
Be sure to answer this question in paragraph form using complete sentences.
*this is what I said* Natural mutations aren't harmful nor beneficial but they are invisible to natural selection. but mutations can still spread into a population
*this is my teacher's feedback*Essay Feedback
good, but how does it relate to the molecular clock?
2.
Snakes and worms have no legs and share a similar tube-like body structure. Describe how you could determine how closely related these two types of organisms are.
Be sure to answer this question in paragraph form using complete sentences.
*this is what i said*
The snakes and worms most likely have a common ancestor that had tube-like bodies and no legs.
* This is what my teacher said* Nice start, but how do we know and what could we do to check out to know more.
3
A certain segment of DNA can be used as a molecular clock. Its rate of mutation is one mutation per 15 million years. Examine the DNA segments from two different species:
Species A: GTTGAGCTAGTATGGACC
Species B: GATAAGCTAGTAAGGTCA
Using this example, explain how this information can be used to determine how long ago these two species shared a common ancestor.
Be sure to answer this question in paragraph form using complete sentences.
* this is what I said *
while comparing species a and b together I see that 1 mutation occurs every 15 million years and I noticed that they had to share the same ancestor 75 million years ago.
Essay Feedback
* this is what he said* good try, but please take another look, I got 5 mutations, and what do you need to do with that info to find how long they shared a common ancestor?
Answers: 2
Biology, 22.06.2019 07:40, pulliamdylan
Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one
Answers: 1
Biology, 22.06.2019 08:30, thompsonjeremiah837
Which coal field location is related to coal fields in the eastern united states and supports the theory of continental drift? eastern india southern africa western australia northern south america
Answers: 3
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