Two homozygous strains of corn are hybridized. They are distinguished by six dif

Question

Two homozygous strains of corn are hybridized. They are distinguished by six different pairs of genes, all of which assort independently and produce an independent phenotypic effect. The F1 hybrid is selfed to give an F2. a. What is the number of possible genotypes in the F2? b. How many of these genotypes will be homzygous at all six gene loci? c. If all gene pairs act in a dominant-recessive fashion, what proportion of the F2 will be homozygous for all dominants? d. What proportion of the F2 will show all dominant phenotypes? Two homozygous strains of corn are hybridized. They are distinguished by six different pairs of genes, all of which assort independently and produce an independent phenotypic effect. The F1 hybrid is selfed to give an F2. a. What is the number of possible genotypes in the F2? b. How many of these genotypes will be homzygous at all six gene loci? c. If all gene pairs act in a dominant-recessive fashion, what proportion of the F2 will be homozygous for all dominants? d. What proportion of the F2 will show all dominant phenotypes?

Explanation / Answer

three genotypes per gene equals 3^6 possible genotypes b. that's 2 homozygous genotypes per gene for 6 genes. 2^6 c. 1/4 of all of F2 will be dominant and homozygous for each gene, so for 6 separate genes, it's .25^6 d. 3/4 will show a dominant phenotype for each gene, so that's .75^6

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