Biology, 07.03.2020 00:18, gracie0818

You are working with two recessive mutations in Drosophila: e causes ebony and ro causes rough eyes. You cross a true-breeding strain of ebony flies (e e, ) with a true-breeding strain of rough-eyed flies ( , ro ro). You then cross the F1 to a true-breeding strain with ebony body and rough eyes. a) What are the predicted F2 genotype proportions if e and ro are on separate chromosomes

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answered: OlamideO3

The predicted F2 genotype proportions are 1:1:1:1

Explanation:

Available data:

e causes ebony ro causes rough eyese and ro are recessive mutations

A- Cross a true-breeding strain of ebony flies (e e, ++) with a true-breeding strain of rough-eyed flies (++, ro ro)

Parental) e e , + + x + + , ro ro

Gametes) e+ e+ e+ e+ +ro +ro +ro +ro

Punnet square) e+ e+ e+ e+

+ro +e+ro +e+ro +e+ro +e+ro

F1) 100% +e+ro

B- Cross the F1 to a true-breeding strain with ebony body and rough eyes.

Parental) +e,+ro x ee, roro

Gametes) ++ ro+ e+ ero ero ero ero ero

Punnet square) ++ +ro e+ ero

ero +e+ro +eroro ee+ro eeroro

F2) 4/16=1/4 +e,+ro

4/16=1/4 +e,roro

4/16=1/4 ee,+ro

4/16=1/4 ee,roro

The predicted F2 genotype proportions are 1:1:1:1

You can also calculate it by making the punnet square for each gene and then multipling the genotypic proportions, like this:

Parental) e + x e e + ro x ro ro

Gametes) e + e e + ro ro ro

Punnet Squares) e + ro +

e ee +e ro roro +ro

F1) 1/2 ee F1) 1/2 +ro

1/2 +e 1/2 roro

F2 genotype proportions)

+e,+ro = 1/2 +e x 1/2 +ro= 1/4 +e,+ro

+e,roro= 1/2 +e x 1/2 roro= 1/4 +e,roro

ee,+ro= 1/2 ee x 1/2 +ro= 1/4 ee,+ro

ee,roro= 1/2 ee x 1/2 roro= 1/4 ee,roro

answered: Guest

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

answered: Guest

because the light is a great source of energy for the plants to survive. (i hope this )

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You are working with two recessive mutations in Drosophila: e causes ebony and ro causes rough eyes....