Other Crosses - Other Crosses S = smooth s = wrinkled P1 F1...

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Other Crosses S = smooth s = wrinkled P 1 SS X ss F 1 Ss Ss X Ss F 2 genotype ratio = 1:2:1 (1SS : 2Ss : 1ss) phenotype ratio = 3:1 (3Smooth : 1 wrinkled) F = full f = constricted P 1 FF X ff F 1 Ff Ff X Ff F 2 genotype ratio = 1:2:1 (1FF : 2Ff : 1ff) phenotype ratio = 3:1 (3full: 1 constricted) Alleles and Loci An allele is a gene that has more than one form. Each of the forms is referred to as an allele. For example, the gene for red flowers and the gene for white flowers are two different alleles. A locus (plural: loci ) is the location of a gene on a chromosome. The gene for red flowers and the gene for white flowers are two different alleles at the same locus. A single chromosome can have a gene for white flowers or a gene for red flowers but not both. There are two loci illustrated below, one is for flower color and the other is for stem length. Flower color has five alleles and stem length has two.
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Practice Crosses Let " A" represent the allele for yellow seeds and " a" represent the allele for green seeds. For
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This note was uploaded on 12/15/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Other Crosses - Other Crosses S = smooth s = wrinkled P1 F1...

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