Which of the following disorders results from changes in an individual gene?

a. klinefelter's syndrome
b. sickle-cell disease
c. trisomy 21
d. turner's syndrome

You see a white marker with an orange circle and black lettering. what does this marker tell you

When ash and dust begin to settle on the ground, they eventually become compacted by

3. in the fruit fly, recessive mutation brown, b, causes brown color of the eye and absence of red pigment. recessive mutation p of another independent gene causes purple color of the eye and absence of brown pigment. the cross of a brown-eyed female and purple-eyed male produced wild type eyes. what will be the colors and their ratio in f2?