Final answer:
The term for when there are conflicts between an individual's sex chromosomes and their genital appearance, making it hard to determine their biological sex at birth, is 'intersex'.
Step-by-step explanation:
When Nik was born, determining Nik's biological sex was difficult due to conflicts between sex chromosomes and the appearance of genitals. The term that refers to this situation is intersex. This term is an umbrella for those with variations in sex characteristics that don't fit typical male or female categories. Examples of these variations include differing numbers of sex chromosomes like XO or XXY, variations in hormone levels, or anatomical differences that aren't immediately identifiable as male or female. Cultural perspectives often try to assign a binary gender at birth, but this does not always align with an individual's biology. The identity of intersex individuals and the complexity of gender as a spectrum challenge the binary understanding of sex and gender.