Introduction to Genetic Analysis 37

Introduction to - 44200_02_p27-72 11:37 AM Page 36 36 tion from the chromosome carrying a so half the resulting gametes carry A and the other half

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36 Chapter 2 Patterns of Inheritance tion from the chromosome carrying a ; so half the result- ing gametes carry A and the other half carry a . The situ- ation can be summarized in a simplified form as follows (meiosis will be revisited in detail in Chapter 3): as expected (see Table 2-1). To perform a dihybrid cross, Mendel started with two parental pure lines. One line had yellow, wrinkled seeds. Because Mendel had no concept of the chromosomal location of genes, we must use the dot representation to write this genotype as Y / Y ± r / r . The other line had green, round seeds, with genotype y / y ± R / R . The cross between these two lines produced dihybrid F 1 seeds of genotype Y / y ± R / r , which he discovered were yellow and round. This result showed that the dominance of Y over y and R over r was unaffected by the condition of the other gene pair in the Y / y ± R / r dihybrid. Next Mendel made the dihybrid cross by selfing the dihybrid F 1 to obtain the F 2 generation. The F
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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