Question

in human males all the chromosomes are paired perfectly expect
21st chromosome
y chromosome
small chromosome
x chromosome ​

Answer 1

x chromosome............

Answer 2

Answer:

Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA). ... Chromosomes are thread-like structures located inside the nucleus of animal and plant cells.