Bio 201 S14 Class 5 2 5 14 v2

G yeast a and cells not male and female gametes are

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Unformatted text preview: Muta1on (previous lecture) •  Recombina1on –  Usually associated with sexual reproduc1on but make take place in other ways •  E.g. between small circular DNAs called plasmids and the genomes of bacterial cells •  Sexual reproduc1on –  Usually directly associated with recombina1on •  Recombina1on (crossing over) takes place during meiosis, when gametes are formed –  Provides for the existence of HETEROZYGOTES – individuals have one copy of each gene from each parent •  If they are the same – HOMOZYGOUS •  If they are different – HETEROZYGOUS –  In popula1ons – LEVEL OF HETEROZYGOSITY (% OF GENES (NUCLEOTIDES) THAT ARE HETEROZYGOUS) is an important measure of gene1c varia1on SLIDE 8 Sexual reproduc1on •  Eukaryotes have it; prokaryotes (bacteria, archaea) do not •  Key feature: haploid cells (gametes) from the male reproduc1ve 1ssue (gonad in animals) and the female reproduc1ve 1ssue unite to form a diploid zygote –  Single celled eukaryotes also typically have sexual reproduc1on (e.g. yeast: a and α cells, not male and female) –  Gametes are formed by meiosis – (see next several slides for a...
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