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.
The father's genotype could be XB Y or Xb Y. The father's X chromosome does not matter if the offspring is male. The mother's genotype could be XB Xb or Xb Xb. The more likely of the two is XB Xb, because colorblind females are rare. For a female child, the genotype would have to be Xb Xb. For this combination, the father would have to be colorblind (Xb Y) and the mother would have to either be colorblind (Xb Xb) or a carrier (XB Xb). Newer Post Older Post Home.