SAMPLE APA PAPER FOR STUDENTS 2. Abstract. You may not have to include an abstract with your paper; if in doubt, ask your instructor. The. abstract is a single paragraph in block format (without paragraph indentation) and should be. between 150 and 250 words. Be sure to understand the difference between the abstract (a.
In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively. Hormone levels in the male parent affect the sex ratio of sperm in humans.
Best Answer: Sex chromosomes are either X or Y. They determine the sex of the baby... XX = female. XY = male Autosomes are every chromosome except for the sex chromosomes. They have no affect in the outcome of the sex of the organism Humans have 46 chromosomes, which means we have 23 pairs. The 23rd pair of human chromosomes are sex chromosomes. All 22 other pairs are autosomes.