Genetics2 - Mendel's First Law Law of segregation of...

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Co In E Mendel's First Law Law of segregation of characteristics States that when any individual produces gametes, the copies of a gene separate, so that each gamete receives only one copy. A gamete will receive one allele or the other.
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Co In E Mendel's Dihybrid Crosses • Two Different traits in the same cross • Example: seed color and seed shape • Is the segregation pattern of one gene influenced by the segregation of another gene? 27 Answer = yes and no Depending on whether the genes are linked
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Co In E Spherical yellow seeds = SSYY Wrinkled green seeds = ssyy If the spherical gene is linked to yellow = SY And wrinkled is linked to green = sy l l l l S Y s y Gametes = SY sy Big S always with Big Y For linked genes:
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Co In E SYSY X sysy Gametes linked = SY or sy F1 = SYsy X SYsy Gametes = SY sy or SY sy F2 = SYSY SYsy sySY sysy Ratio = 3 : 1 Spherical/yellow Sph/yellow wrinkled/green wrinkled/green
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Co In E Figure 10.7 Independent Assortment 28 For unlinked genes F1 and F2 = 4 kinds of gametes 3 possible genotypes for shape = SS Ss or ss 3 possible genotypes for color = YY Yy or yy 9 different genotypes / 4 phenotypes
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In E Law of independent assortment Mendel’s second law, the law of independent assortment , states that alleles of different genes (e.g., Ss and Yy ) assort into gametes independently of each other. To determine this, he used dihybrid crosses , or hybrid crosses involving additional characters. The dihybrid SsYy produces four possible gametes that have one allele of each gene: SY, Sy, sY, and sy. Random fertilization of gametes results in offspring with
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This note was uploaded on 10/16/2010 for the course MCDB MCDB 1A taught by Professor Senghuilow during the Spring '09 term at UCSB.

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Genetics2 - Mendel's First Law Law of segregation of...

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