C. the microscope needs to be protected from dust
Answer:
1/4
Explanation:
Given that the F2 cross produces offspring according to the expected 9:3:3:1 ratio.
YyRr X YyRr:
Let us break the dihybrid cross into individual monohybrid crosses.
Yy X Yy :
Y y
Y YY Yy
y Yy yy
2/4 or 1/2 of the offspring are heterozygous for the trait.
Similarly, in Rr X Rr cross, 1/2 of the offspring are heterozygous for the trait.
Together, 1/2 * 1/2 = 1/4 of F2 plants are expected to be heterozygous for both traits.
The thermosphere keeps the earth from geting to hot frome the sun and it's the last layer so...the thermospher
I am pretty sure that student is <span>D. Making a prediction. You can't make sure before particulare investigating, but you surely can try tu predict particular information and after that move to proveng it by performing many several actions. So, for this position I would choose the last optio as the correct answer. Hope you will agree with me :)</span>
