Abnormalities in the sex chromosome combination can result in a variety of gender-specific conditions that are rarely lethal. You're on your way to a new account. The sex chromosomes are referred to as X and Y, and their combination determines a person's sex. Password must be at least 8 characters long. When it meets the egg, which also has 23 chromosomes, it forms a zygote which has the full complement of 46 chromosomes in the case of a human. The sperm nuclei reach the eggs through fertilization tubes, similar to the pollen tube mechanism in plants.
They consist of a head and a tail.
How sperm and eggs develop precisely 23 chromosomes each
Before the tube reaches the ovulethe nucleus of the generative cell in the pollen grain divides and gives rise to two sperm nuclei, which are then discharged through the tube into the ovule for fertilization. Phone number is invalid. Email is not a valid email. A new UC Davis study that explains the actions of a gene mutation that causes early onset cancer provides a fundamental insight into the mechanism of DNA-break repair. How many chromosomes will each cell have?