The chance of two genes being separated in a cross-over is to . A. Directly proportional; the size of the chromosome
B. Directly proportional; the distance between them
C. Inversely proportional; the distance between them
D. Inversely proportional; the chromosome number

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.