Table of Contents
Does a zygote have an X chromosome?
Growth, Development, and Reproduction The zygote’s sex is defined by its sex chromosome complement. All oocytes have an X chromosome (because female diploid cells are XX). Sperm may carry either an X chromosome or a Y, in keeping with the XY genotype of the diploid male.
Can YY males survive?
YY males of the dioecious plant Mercurialis annua are fully viable but produce largely infertile pollen. These authors contributed equally to the work.
Which is the determining factor in the sex of a zygote?
The Determining Factor in the Sex of a Zygote. Men and women have two sex chromosomes. Women have two X chromosomes and men have one X and one Y. When the female body forms the eggs, she only has X chromosomes to contribute. Men have a 50 percent chance of contributing either an X or a Y since they have both.
Where does the DNA for a zygote come from?
A zygote forms when sperm fertilizes an egg. In humans, both the egg and the sperm provide 23 chromosomes so that when they fuse together, the cell has 46 chromosomes — the standard number for human cells. That means half of the genetic material comes from the mother and the other half is from the father.
How many sex chromosomes do men and women have?
Men and women have two sex chromosomes. Women have two X chromosomes and men have one X and one Y. When the female body forms the eggs, she only has X chromosomes to contribute. Men have a 50 percent chance of contributing either an X or a Y since they have both.
Where does the zygote go after fertilization?
After fertilization, the zygote travels through the fallopian tube. It begins to divide, creating a ball of cells called a blastocyst. After about five days, the blastocyst reaches the uterus for implantation. The inner cells form the embryo and the outer cells form the protective membranes.