CHYS 2P35 Lecture 4: CHYS 2P35- Sept 28
5 Oct 2016
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Father"s sperm + mother"s ovum = zygote with 46 chromosomes in total. The process by which a cell separates chromosomes in its nucleus into two identical cells. Made up of dna: the chemical code for development. Chromosomes within sperm cells divide in half before they fertilize an ovum or egg cell. Chromosomes with egg cells divide in half before they are fertilized. The randomness creates variation in the resulting embryo. Sex of child determined by father"s sperm. Direct production of amino acids necessary for forming new cells. Guide cells to develop different parts of body. May turn on or turn off other genes. One member from mother, one from father. Some alleles are stronger than others: dominant or recessive. Both gene are dominant or both recessive. To express a trait one must have a homozygous recessive allele. One gene is dominant and one is recessive. Dominant genes are almost always stronger than recessive genes.
