BIOL10005 Lecture 6: BIOL10005 Lecture 6 Notes
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20 Sep 2018
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Crosses between pure breeding lines di ering in two unrelated characters. A dihybrid cross can produce new combinations of traits that were not present in the parents. Particular ratios of di erent phenotypes are consistently observed. Suggests the alleles of the di erent genes were being shu ed with respect to each other. Alleles of each gene in monohybrid cross: 3:1 phenotypic ratio. Important that alleles sort independently of each other when they segregate. Any cross to an organism that is homozygous for the alleles that express the recessive phenotype is termed a testcross". The crosses have di erent outcomes if the genes is on a sex chromosome. Autosomal cross will produce the same ratio of phenotypes in the f1. Sex linked cross will produce di erent ratio of phenotypes in the f1. For an x linked trait females have twice the gene product of a male. In early embryonic development of a camel one x is switched o .
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