Chromosome testing looks at the number and type of chromosomes in your cells, similar to sex testing you can have when pregnant they look under a microscope and see if you have the normal number, any extras eg trisomy like in Down's syndrome and whether your sex chromosomes (pair 23) are 2 the same i.e 2 X chromosomes XX genotype (= female developmental pathway will be expressed) or 2 different ones, a long X chromosome and a short Y chromosome XY genotype (= male developmental pathway will be expressed).
Genetic testing is used interchangeably but really means doing a much nore complex analysis of mutations, and their effects, in the genes on various chromosome i.e small parts of the DNA on individual chromosomes that can be have coding differences from the norm = a genetic mutations.
DSD Disorders of Sexual Development can arise from chromosomal abnormalities eg an extra chromosome eg XXY (still phenotypically male) or as a result of downstream genetic mutations which cause different effects eg under virilization of the secondary sex characteristics in the foetus eg XY males with 5ARD - mutation on the gene (not on the sex chromosomes, on another chromosome entirely) that produces DHT - a precursor to testostetone that is responsible for the virulization of secondary sex characteristics in the foetus i.e forming a little penis. This function is taken over by the testes and actual testosterone at puberty, in this condition, so these boy babies, who could well have been mistaken as girl babies in places where they dont do proper chromosomal or genetic testing when babies with ambiguous genitalia are born, undergo normal male puberty and develop pretty much as normal men from that point.
Distessing for the individual but should not be in normal XX female sports because they have been tbrough male puberty and have the potential strength, cardiac, muscle advantage of men. Whether they're not great boxers , naturally short and small, dont train enough or whatever and lots of women can beat them is irrelevant. They are genetic and phenotypical (eventually) males.
Remeber that what it looks like between your legs is only the end resukt of a conplex biological pathway and is only really of secondary importance (hence why they're called 'secondary sex characteristics') what determines yoyr sex is your primary sex characteristics - testes or ovaries and capabale of producing sperm or eggs. Its one or the other. There is no human on the planet, ever, no DSD condition, no identiftying as that has resulted in a human, or indeed mammal, that can produce both sperm and eggs. Sex is binary I am afriad and hence there are 2 sex categories for sports.
This was all in GCSE Biology people.
If these 2 boxers are claming to have the extremely rare DSD CAIS complete androgen insensitivity syndrome where they are XY but have a downstream mutation in testosterone receptors such that they are completely insensitive to testosterone for their entire lifecycles, then let them state that in public with medical evidence and i am sure no one would have a problem with them competing in womans sports, as they are functionally female and crucially do not go throughmale puberty. Its very unlikely though that such individuals with the medical issues that go with that condition would make it into elite sports and they would not look like normal men, like they do.