About mtDNA and it's advantages Watch

Terminatoring
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#1
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'Describe the features of mtDNA that make it a helpful source of evidence for human migration & evolution'

The mark scheme says:

High mutation rate

Maternally inherited

No recombination

I don't understand why these are helpful? Thanks to whoever can answer this


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aliciahaydenx
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It is only inherited from the mother because only the nucleus of the sperm enters the egg at fertilisation. The mitochondrial DNA comes from the mitochondria of the egg cell so thats why it is maternally inherited, this makes it easier for us to track it back because it shows who the mother is, the high mutation rate helps us see similarities and differences between people, i hope this makes sense lol im struggling with this too
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Leyla123
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Can anyone explain the menstrual cycle please really struggling
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Dynamo123
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(Original post by Leyla123)
Can anyone explain the menstrual cycle please really struggling
Which stage do you find difficult to understand?
Plus, it would be better if you created a new thread for this, as then more people will be able to view your query
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aliciahaydenx
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(Original post by Leyla123)
Can anyone explain the menstrual cycle please really struggling
Well, im guessing you mean about all the hormone stuffs-
The pituitary gland (located near the brain) Produces FSH which stimulates the follicle in the ovary, the follicle is what the egg grows in before it is ovulated.
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The developing follicle stimulates oestrogen release. This is released from the ovaries. Oestrogen causes the lining of the uterus to thicken, it stops FSH production.
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LH is released because of high levels of oestrogen, a surge of this causes the ovulation of the egg from the ovary. The developed follicle that is left behind is called the 'corpus luteum'.
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Corpus Luteum releases progesterone, this stops the release of LH.
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The corpus luteum shrinks, this means that less progesterone is being released. Falling levels of progesterone and oestrogen trigger ovulation and FSH to be released again to restart the process.

Hope this helps Good luck!
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Leyla123
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(Original post by aliciahaydenx)
Well, im guessing you mean about all the hormone stuffs-
The pituitary gland (located near the brain) Produces FSH which stimulates the follicle in the ovary, the follicle is what the egg grows in before it is ovulated.
|
|
|
v
The developing follicle stimulates oestrogen release. This is released from the ovaries. Oestrogen causes the lining of the uterus to thicken, it stops FSH production.
|
|
|
v
LH is released because of high levels of oestrogen, a surge of this causes the ovulation of the egg from the ovary. The developed follicle that is left behind is called the 'corpus luteum'.
|
|
|
v
Corpus Luteum releases progesterone, this stops the release of LH.
|
|
|
v
The corpus luteum shrinks, this means that less progesterone is being released. Falling levels of progesterone and oestrogen trigger ovulation and FSH to be released again to restart the process.

Hope this helps Good luck!


Thank you soo much !!
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aliciahaydenx
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(Original post by Leyla123)
Thank you soo much !!
No problem!
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