Let me guess, biology threw out calculus and differential equations out of their curriculum so that now there are no "weeding out" classes. Literal retards.
And don't think I am overreacting. That 3rd year bio major may as well be a pre-med bio major and in 2 decades (when he finally gets accepted into med school) he could be the one treating your life threatening disease and at that moment he may "make a mistake with one fact" and kill you.
Seriously, can we pass a law that makes it legal to kill every biology major that does not get accepted into med-school right after graduation?
Alleles (I.e. Versions of a gene )are located on chromosomes so if an allele mutates then the chromosome does too. So his objection is wrong. It is not incorrect to say that a chromosome mutates like he claims.
Also saying that chromosomes can only be x or y is very silly as it seems to imply that all X chromosomes are the same and all Y chromosomes are the same. It also seems to imply that any chromosome can be x or y when in reality only one of the sex chromosomes can be Y and the rest are all Xs
This is also related to chromosomal polymorphism, the y chromosome is indeed shrinking, but this process is not happening at the same time for all of the human population, some men have abnormally long y chromosomes.
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