Which term refers to the sex that has two different types of sex chromosomes?

The term that refers to the sex with two different types of sex chromosomes is heterogametic. In many species, this is typically the male sex, which possesses one type of sex chromosome (like XY in humans), while the female sex is homogametic, carrying two of the same type of sex chromosomes (such as XX in humans). Heterogametic organisms can produce gametes that carry different sex chromosomes, leading to variation in offspring.

This terminology is important in genetics as it helps to understand patterns of inheritance and the genetic basis of sex determination. In contrast, homogametic refers specifically to having identical sex chromosomes, while diploid refers to having two complete sets of chromosomes and monogamous describes a mating system rather than a genetic or chromosomal condition.