<span>one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.</span>
Sister chromatids have different alleles although carry same genes on same loci. So if it doesn't happen so, like if there are same alleles on sister chromatids then there is a problem in its formation. i.e., male and female alleles haven't contributed equally ( may be an error during their segregation process ). And obviously it doesn't happen in a real cell so we must understand this point. Because normally whenever it happens there's one half from the male and one half from the female. (i.e. maternal and paternal alleles contribute equally).
I hope you get the answer!!!
Answer:
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v
Explanation:
photosynthesis creates oxygen, water and glocose(starch) and we take in those and use it in our mitochondrias to create atp so it can hapen all over again.
The first one is 100% and the second one is 50%
