Sexy TIMES! Reproduction and Sexual intercourse
What 2 things do you need to make a baby? • 1. Sperm from the male • 2. An ovum (egg) from the female • In order to create new life, a sperm cell must join and enter an ovum (fertilization)
How many days can an ovum survive once released? • The ovum generally has a lifespan of one day. If it is not fertilized, it will disintegrate and gradually be discharged in the menstrual flow. • (and no, you can’t see the egg in the toilet! It’s microscopic)
How many days can a sperm survive once in the vagina/uterus? • The sperm’s lifespan is up to 5 days. • If the sperm cell enters the ovum, fertilization occurs.
What is a chromosome? • Chromosomes contain all the genetic material that makes the newly developing human unique • Ex: hair colour, eye colour, body size and shape, etc.)
How many chromosomes does a sperm/ovum contain? • A sperm contains 23 chromosomes • An ovum contains 23 chromosomes • Each chromosome matches the corresponding chromosome from the other parent, forming 23 numbered pairs.
What happens with less or more chromosomes? • Most fetuses with chromosomal anomalies are miscarried during the first trimester. • First trimester: • Week 1 – Week 12 (first 3 months of pregnancy) • Most of those who survive have Down syndrome; it's caused by an extra chromosome 21.
What does the “X” and “Y” chromosome mean? • X = female • Y = male
Does the Sperm or Ovum decide on the sex of the baby? • The sperm (father) contributes the X or Y chromosome that will decide the sex of the baby. • Ex: The mother’s ovum has two XX chromosomes (female). The father’s sperm has XY chromosomes (female/male). Each parent contributes ONE of those two chromosomes.
How are fraternal twins (non-indentical) made? • If two eggs are released during ovulation and both are fertilized by a different sperm, fraternal twins are created.
How are identical twins made? • When one ovum is fertilized but splits into two eggs.
For the first two months, what is the baby called? • The baby is called an embryo for the first 8 weeks (2 months) and kinda looks like a little alien!
What is the baby called from 8 to 40 weeks? • The baby is then called a fetus for the rest of the pregnancy.
Where is the ovum fertilized? • The ovum is fertilized in the Fallopian tube, where it then moves into the uterus and imbeds itself in the thick, nourishing lining.