Which best describes a gene? different allele forms of a trait tightly coiled strands of DNA the center of a chromosome a segment of chromosomal DNA.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project

the answer is c. altitude. hope this ! #brainiac