Question

chromosomal inheritance: phenotype of xxy
in humans, if a non - disjunction event led to an individual with a genotype of xxy, they would
multiple choice
be male because they have a y chromosome.
not survive.
display both male and female characteristics.
be female because they have two x chromosomes.

Explanation:

In humans, the presence of a Y chromosome determines maleness. Even with an extra X chromosome (XXY), the Y chromosome's SRY gene (sex - determining region Y) initiates male development. Individuals with XXY (Klinefelter syndrome) are male. They do survive (contrary to the 'not survive' option). Having two X chromosomes doesn't override the Y - chromosome - based maleness determination. And they don't display both male and female characteristics in a simple 'both' sense; they have male - typical gonads (testes) but may have some secondary sex - characteristic differences (like reduced facial hair, breast development) due to hormonal and genetic interactions, but the primary sex determination is male.

Answer:

be male because they have a Y chromosome.