Reproduction

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DNA Molecule

Sex Chromosomes Male embryos usually have an X and a Y chromosome in every cell, whereas females have two Xs in every cell. When a human egg (from the mother) is fertilized by a sperm (from the father), together they form an embryo. The egg and sperm cells each contain a half-set of chromosomes – so the embryo comes to inherit a full set of chromosomes containing all the genetic instructions required for life, half from the mother, half from the father. A person’s chromosomal profile is called their karyotype. One particularly important pair of chromosomes is the sex chromosomes which, as the name implies, determine the sex of the embryo. The sex chromosomes are the X chromosome and the Y chromosome. An oocyte (egg cell) from the mother almost always carries a single X chromosome, while a sperm cell from the father typically carries either an X or a Y chromosome (but not both). Depending on which type of sperm cell fertilises the egg, an embryo with two X chromosomes (that is, a sex chromosome karyotype of XX) or one X and one Y (XY) normally results. XX embryos usually develop as female, and XY embryos usually develop as males.   Chromosomes Embryos DNA

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Egg & Seed Plants Chicken Fish Humans

Plants

Humans & other Mammals Reproduce Internally  

HUMAN REPRODUCTION TERMINOLOGY

Genes – is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. You share 50% of each of your parent’s genes.                 Offspring – is the product of reproduction.  A human’s offspring is children. A bear’s offspring is a cub. A cow’s offspring is a cafe. a cat’s offspring is a kitten a dog’s offspring is a puppy etc…       Sexual Reproduction – when a male and female cell come together to create a unique organism.                 Sperm – male reproductive cell – 50% of the father’s gene Egg – female reproductive cell – 50% of the mother’s gene Fertilization – joining of reproductive cells; two cells join together and the genetic material combines       Types of Fertilization – Internal & External Internal Fertilization – Egg is fertilized inside of the body Example: A Human’s egg is fertilized inside the body of the woman   External Fertilization – Egg is fertilized outside of the body Example: Fish fertilize their eggs outside their bodies     SIDE VIEW OF THE MALE & FEMALE REPRODUCTIVE SYSTEM INSIDE THE MALE & FEMALE REPRODUCTIVE SYSTEM: Reproductive organs MALE REPRODUCTIVE ORGAN FEMALE REPRODUCTIVE ORGAN   Male and Female Parts Join Together in the Process of Human Reproduction


 

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