EDP 3326 Chapter Notes - Chapter 2: Y Chromosome, Multiple Birth, Chemical Substance
11 Nov 2013
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Phenotypes- directly observable characteristics; way you look. Genotypes- the complex blend of genetic information that determines our species and influences all our unique characteristics; genetic makeup. Describe the structure and function of chromosomes and dna molecules. Describe the genetic events that determine the sex of the new organism. The 23rd chromosomal pair determines the sex of the organism and is referred to as the sex chromosomes in females this pair is xx in males this pair is xy. The x chromosome is relatively large, while the y chromosome is short and carries little genetic material. When gametes form in males, the x and y chromosomes separate into different sperm cells. The gametes that form in females all carry an x chromosome. Therefore, the sex of the new organism is determined by whether an x-bearing or a y-bearing sperm fertilizes the ovum. Identify two types of twins, and explain how each is created.
