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BIOL 2330 (7)
J.Kalra (7)
Lecture

Alleles.docx

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Department
Biology
Course
BIOL 2330
Professor
J.Kalra
Semester
Winter

Description
Alleles  Alleles are different versions of a specific gene  Different alleles may code for conflicting traits (e.g., long verse short earlobes)  The actual physical expression of a trait depends on which allele is dominant and on how many genes are involved in expressing that trait – whether it’s a monogenic or polygenic trait Cell Replication  Somatic cell replication is called mitosis o Grow an organism o Heal o New cells out of older cells  Sex cell replication is called meiosis Mitosis  46 single-stranded chromosomes (mother cell)  DNA replication  46 double-stranded chromosomes  Mitosis  46 single-stranded chromosomes (daughter cell)  Two diploid cells  Daughter cell and mother cell have the same DNA Sex Cells  In males: hundreds and millions  In females: five hundred  A sex cell carries only half the chromosomes needed to create a normal individual: 23 o T
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