There are nearly 30 different disorders of sexual development. who can have these disorders? there are nearly 30 different disorders of sexual development. who can have these disorders? people with either xx or xy chromosomesonly people with xy chromosomesonly people with xx chromosomespeople with neither xx nor xy chromosome

Option A

Explanation:

Both the X and Y chromosome are sexual chromosomes with "XX" representing the gamete of a female sex of an individual and "XY" representing the gamete of a male sex of an individual.

Since these two "X" and "Y" chromosome are sex chromosome, there can be no disease that is defined by any other chromosome set including "YY" as well.

Hence  option A is correct

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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