Miss

Miss

This week we're going to talk about Chapter two, prenatal development. We're going to talk about three major topics. That includes conception and basic genetics of conception, development from conception to birth as well as problems in prenatal development. Take a look at the learning objectives that are posed on [inaudible 00:00:27] before you begin. Genetic disorders and chromosomal errors are not covered in either the quizzes or the exams. Okay let's begin. The process of conception. Each month the woman produces one ovum or an egg midway between two menstrual periods. If a woman has section of course while the ovum them is in the fallopian tube, a sperm may travel to the fallopian tube and fertilize the egg.
This new cell that's created in this process is called a zygote. At the moment of conception twenty three chromosomes from the sperm and ovum joining to make twenty three pairs of forty six chromosomes. The sex of the child is determined by the twenty third pair of chromosomes with XX for female and XY for male. Sperm and ovum are referred to as the gametes or germ cells. Genetics of conception. Each chromosome contains genetic information as a string of chemicals called deoxyribonucleic acid or the DNA. DNA is in the shape of a double helix. Strings of DNA that makes up each chromosomes are divided into genes. Each gene controls or influences a particular feature of an organism or a particular developmental pattern.
Members of the first twenty two pairs of chromosomes exactly alike. They are referred to as the autosomes. Members of the twenty third pair of the chromosomes are different from one another. They are referred to as the sex chromosomes. It is the twenty third pair of chromosomes that determines a child's sex. In the next few slides we're going to talk about patterns of genetic inheritance. In this section we're going to explain to you and number of different terms that you may or may not have heard before. First, genetic patterns are either...

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