Humans possess two alleles, or variations, for each gene. the alleles may be the same, or they may be different. when humans reproduce, their alleles are separated and independently sorted into different gametes, or sex cells. so, when sex cells randomly combine during fertilization to produce offspring, there
a. a low probability of survival.
b. an increase in genetic variation.
c. a decreased risk of mutation.
d. a high probability of producing a clone.

What is the problem in this article? what solution does the article propose?

Which of the following is a true statement? a. individuals evolve to have adaptations. b. individuals have adaptations that can change over time. c. individuals have traits that may or may not make them successful at reproduction. d. populations cant evolve, only individual organisms.

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?