Question
In a trihybrid test cross of ++++++ female x blblvgvgbrbr males, would the F1 flies that are crossed both be from the F1 yeilded from the parentals? Or would new ++++++ females be brought in?
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When homozygous dominant (++++++) female fly is crossed with homozygous recessive (blblvgvgbrbr) male fly then all the F1 flies will be heterozygous (+bl+vg+br). This heterozygous F1 flies could be crossed with the both parental flies. If you want to brought in new ++++++ female then you can as its genotype resembles the ++++++ mother. So, same result will be occurred.

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