HDFS 2010 Lecture 3: HDFS 2010 Lecture #3
18 Feb 2019
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Matching genes and chromosomes : homozygous: two genes of one pair that are exactly the same in every letter of their code, heterozygous: two genes of one pair that differ in some way. Twins and more : monozygotic (identical) twins: Originate from one zygote that splits apart very early in development. Same genotype but slight variations in phenotype are possible due to environmental in uences: dizygotic (fraternal) twins: Result from fertilization of two separate ova by two separate eggs. Dizygotic twins have half their genes in common and occur twice as often as monozygotic twins. Incidence is genetic and varies by ethnicity and age. All of the microbes (bacteria, viruses, and so on) that live every part of out bodies. Thousands of varieties of microbes; estimated that each microbe has 3 million different genes. The gut as a second brain - importance of nutrition.
