lecture10+mendel+1-1

This is a dihybrid cross true breeding parents ssyy

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Unformatted text preview: hosen randomly Segrega3on during meiosis Defini3ons Gamete Diploid/haploid Chromosome Gene Locus Allele Homozygous/ heterozygous •  Dominant/recessive •  •  •  •  •  •  •  Mendel’s 2nd Law of Heredity: Independent Assortment Mendel’s next experiment: •  Crossing peas that differed in two characters—seed shape and seed color. •  This is a DIHYBRID cross True-breeding parents: •  SSYY: •  ssyy: spherical yellow seeds wrinkled green seeds The results of the dihybrid cross: Independent assortment of the 2 loci SY sy sy sy SsYy SsYy ssyy With Independent Assortment Without Independent Assortment Why did independent assortment occur? Is there any case where it wouldn’t? Mendel’s 2nd Law: The Law of Independent Assortment 1.  Alleles of different genes assort independently during gamete formation if they are on different chromosomes. •  That is, chromosomes assort independently. 2.  Genes close together on the same chromosome are physically linked and generally do no assort independently. •  As you’ll see, when genes on the same are widely separated they may recombine so frequently that it appears as if th...
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