Yellow Bodies & Curly Wings

A Genetics Investigation by Hannah Phillips

Claim

The yellow body trait is sex-linked.
The curly wings trait is dominant recessive.

Yellow Bodies

The punnet squares and percentages below prove that the yellow body trait is sex-linked. A sex-linked trait follows this pattern: Parent= 50%-50% --> 1st offspring=50%-50% --> 2nd offspring= 25%-25%-25%-25%. Because both the punnett squares and percentages line up with the sex-linked expected percentages, we can safely assume that the yellow body trait is sex-linked.

Evidence 1

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Evidence 2

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Evidence 3

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Reasoning

This data is relevant to the finding of the mode of inheritance of yellow bodies, as it shows the experimental crosses of the fruit flies, and it also shows the expected percentages that should be the outcome of the cross. We can easily eliminate dominate recessive, as the 1st offspring doesn't match the expected percentages for dominate recessive. We can eliminate codominance as incomplete dominance as well as again, the percentages don't line up in the F1 generation. The yellow bodies trait can't be multiple alleles as we are only dealing with 2 alleles.

Curly Wings

The data percentages and punnett squares show that the curly wings is a dominate-recessive trait as it follows the expected percentages pattern. The percentage pattern is as follows: parent=50%-50% --> F1=100% --> F2=25%-50%-25%. Because both the punnett squares and percentages line up with the dominate-recessive expected percentages, we can safely assume that the curly wings trait is dominate-recessive.

Evidence 1

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Evidence 2

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Evidence 3

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Reasoning

This data is relevant to the finding of the mode of inheritance of curly wings, because it shows the expected percentages of the crosses, which matches the expected percentages of dominate recessive traits. We can assume that the curly wings trait is dominate recessives, as it matches only matches the percentages of the dominante recessive, not the other modes of inheritance. Although the percentages are similar to both incomplete dominance and codominace, we know that there is not a blend of curly and wild, nor both curly and wild. So as a result, we can eliminate incomplete dominance and codominance