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.
Answers. Best Answer: A karyotype is picture of all the chromosomes. In order to do this the cells are arrested in metaphase and the DNA is stained. The diference between the karyotype of human males and females is simply that females have two X chromosomes while males have an X and a Y chromosome.The other 22 chromosomes are the same between human males and females. Below is a link to a karyotype of a human male.Source(s):he diference between the karyotype of human males and females is simply that females have two X chromosomes while males have an X and a Y chromosome. The other 22 chromosomes are the same between human males and females. Below is a link to a karyotype of a human male. Source(s):