How does sexual reproduction play an important role in variation? A. Implantation into the uterus provides the embryo with DNA from the mother to create more variation.
B. Production of unique gametes during meiosis, and the random combination of male and female gametes upon fertilization provides a large amount of variation.
C. Male and female gametes combine randomly during fertilization, and then each gamete randomly selects half of its DNA to give to the embryo.
D. Sexual reproduction is not related to variation.

What is the importantence of the carbon and nitretan cycles in the environment

How does the study of genetic disorders such as pku biologists understand normal alleles?

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area