In Drosophila, a cross was made between females expressing thethree X-linked recessive traits, scute bristles (sc), sable body (s),and vermilion eyes (v), and wild-type males. All females were wildtype in the F1, while all males expressed all three mutant traits.The cross was carried to the F2 generation and 1000 offspringwere counted, with the results shown in the following table. Nodetermination of sex was made in the F2 data. Question:Calculate the coefficient of coincidence; does this represent positive or negative interference? Phenotype Offspringsc s v                314+ + +               280+ s v                150sc + +             156sc + v               46+ s +                30sc s +               10+ + v                14

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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In Drosophila, a cross was made between females expressing the
three X-linked recessive traits, scute bristles (sc), sable body (s),
and vermilion eyes (v), and wild-type males. All females were wild
type in the F1, while all males expressed all three mutant traits.
The cross was carried to the F2 generation and 1000 offspring
were counted, with the results shown in the following table. No
determination of sex was made in the F2 data.

Question:Calculate the coefficient of coincidence; does this represent positive or negative interference?

Phenotype Offspring
sc s v                314
+ + +               280
+ s v                150
sc + +             156
sc + v               46
+ s +                30
sc s +               10
+ + v                14

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