Genes&Society_1 Colour slide perpage_Lecture2

Learn geneticshereditytraitsmake a karyotype 34 a pair

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Unformatted text preview: genetic information for a protein 33 (Y) (X) Sex Chromosome XX = female XY = male one pair of duplicated chromosomes An organized complete set of chromosomes of a cell or individualthat is usually visualized during certain phase of cell division is refer to as karyotype. Learn genetics>Heredity&Traits>Make a karyotype 34 A pair of homologous chromosomes, each in the unduplicated state (most often one from male parent and its often, one from a male parent and its partner from a female parent). Homologous chromosomes pair up during meiosis and are identical with respect to their genetic loci and centromere placement. A gene locus (plural, loci), the gene locus loci) the location for a specific gene on a specific type of chromosome A pair of alleles (each being a pair of alleles being certain molecular form of a gene) at corresponding loci on a pair of homologous chromosomes Three pairs of genes (at three loci on this pair of homologous chromosomes); same thing as th three pairs of alleles See IVLE animation 35 Flowering plants mammals Genome size in various organisms organisms reptiles Birds amphibians Fish Echinoderms insects worms Algae & Fungi Viruses & bacteria Size of haploid genome (base pairs) 36 Hereditary Traits & Cell Divisions: Hereditary mitosis vs meiosis 37 See IVLE animation 38 Please note that Only a pair of pair of Homologous Chromosome Is shown here 39 40 41 The Famous Royal Hemophiliac Line The GreatGreat-grandaughter Present Queen Elizabeth II Queen Elizabeth II Prince Charles Prince William 42 43 Female Female mammals including humans are mosaic due to humans are mosaic due to X-inactivation One X chromosome remains active, the other are inactivated by forming highly inactivated by forming highly condensed condensed Barr body (red arrow). X-inactivation occurs randomly during embryonic development (12-16 days) (12- 44 Female Female mammals including humans are mosaic due to X-inactivation XA calico cat (is always female), calico cat (is always female) where the r...
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