Meiosis

Cha 13: Meiosis and Sexual Life Cycle ? ready organisms are distinguished by their ability to reproduce their engender kind ? Genetics is the scientific study of heredity and play ? What is variation? ? What is heredity? secure © 2008 Pearson command Inc., produce as Pearson Benjamin cummings Concept 13.1: Offspring acquire genes from parents by inherit chromosomes ? Genes as units of heredity: segments of deoxyribonucleic acid that ? Locus: a specific attitude on a certain chromosome ? intimately DNA is packaged into chromosomes ? In asexual reproduction: founder on exact copies ? In sexual reproduction? right of first publication © 2008 Pearson Education Inc., publishing as Pearson Benjamin Cummings Sets of Chromosomes in tender Cells ? Human somatic cells: 23 pairs ? Homologous chromosomes, or homologs ? One chromosome from from each one parent ? The corresponding size of it and shape ? Same location of centromere ? Genes controlling the same inher ited characteristics: maybe variant versions of the same genes ? With one primal exception: X and Y! Copyright © 2008 Pearson Education Inc., publishing as Pearson Benjamin Cummings 1 Fig. 13-3b Karyotype 5 µm bridge of homologous procreationted chromosomes Centromere Sister chromatids Metaphase chromosome Sexual replica ? ii parents give rise to offspring with unique combinations of genes from the two parents ? Role of reproductive cells: gametes Copyright © 2008 Pearson Education Inc., publishing as Pearson Benjamin Cummings ? A diploid cell (2n) has two sets of chromosomes ? For homo 2n= 46 ? Two sets of 23 ? A gamete (sperm or egg) is haploidic (n) ? For humans n= 23 ? Why is this essential? Copyright © 2008 Pearson Education Inc., publishing as Pearson Benjamin Cummings 2 Fig. 13-4 Key 2n = 6 Maternal set of chromosomes (n = 3) agnatic set of chromosomes (n = 3) Two baby chromatids of one replicated chromosome Centromere Two nonsister chromatids in a homologous p! air Pair of...If you necessitate to get a full essay, order it on our website: OrderEssay.net

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