Crossing-over is a process that occurs during the formation of gametes. How does crossing-over lead to genetic variation?
A. The number of mutations decreases.
B. The number of chromosomes increases.
C. The number of chromosomes decreases.
D. The number of combinations of alleles increases.

Which of these organisms have the greatest amount of cell specialized

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla

Black fur(b) in guinea pigs is dominant over white fur(b). find the probability of a homozygous offspring in a cross: bb x bb. a. 0% b. 25% c. 50% d. 75% e. 100%