Thus, XX mammals are female and XY are male. In humans, biological sex is determined by five factors present at birth: the presence or absence of a Y chromosome, the type of gonads, the sex hormones, the internal reproductive anatomy (such as the uterus in females), and the external genitalia.
https://en.wikipedia.org/wiki/Sex
XY sex determination is found in other organisms, including the common fruit fly and some plants. In some cases, including in the fruit fly, it is the number of X chromosomes that determines sex rather than the presence of a Y chromosome (see below).
https://en.wikipedia.org/wiki/Sex
In these animals it is the female gamete that determines the sex of an individual. Female gametes can either contain a Z chromosome or a W chromosome. Male gametes contain only the Z chromosome.
http://biology.about.com/od/basicgenetics/p/chromosgender.htm
The Iphone 5C is Iphone 5Colorful  5c can also stand for the number 500 (c is the Roman numeral  for 100) or for 5 degrees Celsius (centigrade) . 21 people found this useful. Edit. Share to: Liam Frayne. 27,068 Contributions. Synthesist, Photo and Electrochemical PhD student at Dublin City University.
http://www.answers.com/Q/What_determines_the_sex_of_an_organism-
If the zygote that wins the race to the egg has a Y chromosome in it's back pocket you have made a boy. The last part is right, but a zygote is a fertilized egg... Huma … n's have 46 chromosomes. The female egg (X) and the male sperm (X or Y) have 23 each so that when they meet they make 46. The sperm X or Y have to get to the egg.
http://www.answers.com/Q/What_determines_the_sex_of_an_organism-
Sexual reproduction in eukaryotes is a process whereby organisms form offspring that combine genetic traits from both parents. Chromosomes are passed on from one generation to the next in this process. Each cell in the offspring has half the chromosomes of the mother and half of the father.
https://en.wikipedia.org/wiki/Sex
In Masters and Johnson's original research of the human sexual response cycle, orgasm is the third of four stages, occurring after the plateau phase and before the resolution phase.
http://health.howstuffworks.com/sexual-health/sexuality/orgasm-dictionary.htm
Sex Chromosomes X-Y: The male gametes or sperm cells in humans and other mammals are heterogametic and contain one of two types of sex chromosomes. They are either X or Y. The female gametes or eggs however, contain only the X sex chromosome and are homogametic. The sperm cell determines the sex of an individual in this case.
http://biology.about.com/od/basicgenetics/p/chromosgender.htm
Many insects use a sex determination system based on the number of sex chromosomes. This is called X0 sex-determination —the 0 indicates the absence of the sex chromosome. All other chromosomes in these organisms are diploid, but organisms may inherit one or two X chromosomes. In field crickets, for example, insects with a single X chromosome develop as male, while those with two develop as female.
https://en.wikipedia.org/wiki/Sex
There are 22 pairs of autosomes and one pair of sex chromosomes. The sex chromosomes are the X chromosome and the Y chromosome. Sex Chromosomes: In human sexual reproduction, two distinct gametes fuse to form a zygote. Gametes are reproductive cells produced by a type of cell division called meiosis.
http://biology.about.com/od/basicgenetics/p/chromosgender.htm
what determines the sex of the organism
XY sex determination determines the  sex of the organism.