How Do X And Y Chromosomes Combine To Make Gender Reassignment

1. Gray RH. Natural family planning and gender selection: fact or fiction? Am J Obstet Gynecol. 1991;165:1982–1984. doi: 10.1016/S0002-9378(11)90558-4.[PubMed][Cross Ref]

2. Wilcox AJ, Weinberg CR, Baird DD. Timing of sexual intercourse in relation to ovulation. Effects on the probability of conception, survival of the pregnancy, and sex of the baby. N Engl J Med. 1995;333:1517–1521. doi: 10.1056/NEJM199512073332301.[PubMed][Cross Ref]

3. Jaiyesimi EO, Jaiyesimi RAK. Sex selection. Sexual Health Matters. 2004;5:27–29.

4. Nie JB. Non-medical sex-selective abortion in China: ethical and public policy issues in the context of 40 million missing females. Br Med Bull. 2011;98:7–20. doi: 10.1093/bmb/ldr015.[PubMed][Cross Ref]

5. Dawson K, Trounson A. Ethics of sex selection for family balancing. Why balance families? Hum Reprod. 1996;11:2577–2578. doi: 10.1093/oxfordjournals.humrep.a019171.[PubMed][Cross Ref]

6. Shettles LB, Rorvik DM. How To Choose The Sex Of Your Baby: Fully Revised And Updated (Rev Upd edition) Broadway 2006

7. Gledhill BL. Selection and separation of X- and Ychromosome-bearing mammalian sperm. Gamete Res. 1988;20:377–395. doi: 10.1002/mrd.1120200312.[PubMed][Cross Ref]

8. Cui KH. Size differences between human X and Y spermatozoa and prefertilization diagnosis. Mol Hum Reprod. 1997;3:61–67. doi: 10.1093/molehr/3.1.61.[PubMed][Cross Ref]

9. Gledhill BL, Edwards RG. Can spermatozoa be typed? In: Edwards RG, editor. Preconception And Preimplantation Diagnosis Of Human Genetic Disease. Cambridge University Press; Cambridge, UK: 1993. pp. 203–231.

10. Johnson LA. Isolation of X- and V-bearing sperm for sex preselection. In: Charlton HM, editor. Oxford Reviews of Reproductive Biology. Vol. 16. Oxford University Press; Oxford, UK: 1994. pp. 303–326.

11. Cui KH, Matthews CD. X larger than Y. Nature. 1993;366:117–118. doi: 10.1038/366117b0.[PubMed][Cross Ref]

12. Flaherty SP, Matthews CD. Application of modern molecular techniques to evaluate sperm sex selection methods. Mol Hum Reprod. 1996;2:937–42. doi: 10.1093/molehr/2.12.937.[PubMed][Cross Ref]

13. Jeon HL, Yi JS, Kim TS, Oh Y, Lee HJ, Lee M, Bang JS, Ko K, Ahn IY, Ko K, Kim J, Park HK, Lee JK, Sohn SJ. Development of a test method for the evaluation of DNA damage in mouse spermatogonial stem cells. Toxicol Res. 2017;33:107–118. doi: 10.5487/TR.2017.33.2.107.[PMC free article][PubMed][Cross Ref]

14. Ahmad G, Agarwal A, Esteves SC, Sharma R, Almasry M, Al-Gonaim A, AlHayaza G, Singh N, Al Kattan L, Sannaa WM, Sabanegh E. Ascorbic acid reduces redox potential in human spermatozoa subjected to heat-induced oxidative stress. Andrologia. 2017 doi: 10.1111/and.12773. [Epub ahead of print] [PubMed][Cross Ref]

15. Mesa AM, Roberson RL, Chun RI, Mortensen CJ. Stallion semen incubated with hydrogen peroxide decreased DNA fragmentation as measured by the TUNEL assay. J Equine Vet Sci. 2017;49:81–86. doi: 10.1016/j.jevs.2016.09.007.[Cross Ref]

16. World Health Organization. WHO Laboratory Manual For The Examination And Processing Of Human Semen. World Health Organization; 2010.

17. Hassan DA. Doctoral dissertation. Tshwane University of Technology; 2005. Separation Techniques for X and Y Chromosome Bearing Human Spermatozoa.

Men have sperm and women have eggs, or ova. When a sperm and an ovum combine, you get a zygote: a cell that is a combination of these two cells. This is the beginning of a new human life, and the moment that this happens is called fertilization.

Ova all have X chromosomes. Half of the sperm have Y chromosomes and the other half have X chromosomes. Girls have two X chromosomes. If a sperm with an X chromosome fertilizes the ovum, the fetus will be female. Boys have an X and a Y chromosome. If a sperm with a Y chromosome fertilizes the ovum, the fetus will be male.

Find the probability of a baby's gender.

  • Permanent Marker
  • Masking tape
  • 2 paper cups
  • 3 green marbles
  • 1 red marble
  • Friend
  1. Mark one cup “ova”, and put 2 green marbles into that cup.
  2. Mark the other cup “sperm” and put on green marble and one red marble into that cup.
  3. Make a table with the different options: two green (GIRL), one red and one green (BOY).
  4. Look away and choose one marble from each cup. What are the chances that it will be a boy or a girl? If you choose one marble from each container again and again, how many boys and how many girls will you get? Have your friend tally the results in the table, then put the marbles back into the cups.
  5. Do this 30 times. How many boys did you get? How many girls?

As your numbers increase, you’ll get closer to having half girls and half boys. How close did you get?

Since sperm are equally divided into X and Y chromosome sperm, the chances of having a boy or a girl should be equal. So why do some families have all girls or all boys?

Each time a sperm meets an ovum, there is a 50% chance that it will make a boy and a 50% chance that it will make a girl. It doesn’t matter what happened the time before that: each time an ovum is fertilized, this makes a new zygote that could be a boy or a girl.

As numbers increase, the law of large numbers starts to become easy to see. If you take two or three families you know, they may not have equal numbers of boys and girls. However, if you take 200 random families, they will likely have an almost-equal number of girls and boys.

Try this out, using families at your school or other community group as an example. Does the law of large numbers work?

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