Offspring from the BbVv X bbvv test cross do not show the expected 1:1:1:1 ratio because the genes for body color and wing length are linked. Because offspring with the Bbvv and bbVv genotypes are more common in this cross, the observed phenotypic ratio is 5:1:1:5.
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On the left is the expected phenotypic ratio of the offspring from a BbVv × bbvv cross (1:1:1:1). However, because the alleles BV and bv are linked, the observed phenotypic ratio is much different (5:
On the left is the expected phenotypic ratio of the offspring from a BbVv × bbvv cross (1:1:1:1). However, because the alleles BV and bv are linked, the observed phenotypic ratio is much different (5:1:1:5) than the expected ratio.
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At the beginning of the twentieth century, some scientists noted that different inherited traits seemed to be linked — in other words, these traits were often found together in organisms. In this page, you will learn where the phenomenon of gene linkage originates and how it operates.
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