In drosophila, a red eye is wild type phenotype and there are several other gene

Question

In drosophila, a red eye is wild type phenotype and there are several other genes that also affect eye color. One allele causes purple eyes and a different vermillion eyes. The purple and vermillion alleles are recessive compare to the while types-but may or may not be the same genes. The following crosses were made and the following data were obtained; Cross 1: Males with female vermillion eyes X females with purple eyes: 354 offspring all with red eyes Cross 2: Males with purple. Eyes X with vermillion eyes 212 male offspring with vermillion eyes 221 females off spring with red eyes QUESTION: EXPLAIN THE PATTERN OF INHERITANCE ON THESE RESULTS. WHAT ADDITIONAL CROSSES MIGHY YOU MAKE TO CONFIRM YOUR HYPOTHESIS

Explanation / Answer

  In drosophila, a red eye is wild type phenotype and there are several other genes that also affect eye color. One allele causes purple eyes and a different vermillion eyes.

The purple and vermillion alleles are recessive compare to the while types-but may or may not be the same genes. The following crosses were made and the following data were obtained

  Cross 1: Males with female vermillion eyes         X females with purple eyes

                                          : 354 offspring all with red eyes

male parents are pr+pr+XvY

female parents are prpr Xv+Xv+.

The F1 offspring are RED

pr+Xv

pr+ Y

pr Xv

pr+Xvpr Xv

RED

pr+ Ypr Xv

RED

pr Xv

pr+Xvpr Xv

RED

pr+ Ypr Xv

RED

================

===

Cross 2:

Males with purple. Eyes   X      with vermillion eyes

212 male offspring with vermillion eyes

221 females off spring with red eyes

the male parents are prprXv+Y

female parents are pr+pr+XvXv

prXv+

PrY

pr+Xv

prXv+ pr+Xv

RED

prY pr+Xv

VERMILLION

pr+Xv

prXv+ pr+Xv

RED

prY pr+Xv

VERMILLION

.

the results of these two crosses indicate that the

purple allele is autosomal, and the vermilion allele is X linked

pr+Xv

pr+ Y

pr Xv

pr+Xvpr Xv

RED

pr+ Ypr Xv

RED

pr Xv

pr+Xvpr Xv

RED

pr+ Ypr Xv

RED

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.