Down syndrome is an abnormality in humans where chromosomes pair 21 has an additional chromosome for a total of 3 chromosomes. Which process leads to Down Syndrome? A. When two chromosomes combine during mitosis
B. When two chromosomes are not replicated properly during mitosis
C. When two chromosomes does not replicate during meiosis
D. When two chromosomes fail to separate during meiosis

In sexual reproducing animals once fertilization of the egg takes place, the exists as a single cell until cell division begins. a) egg b) larva c) sperm d) zygote

Apopulation of rabbits live in a local forest. some had a mutation for a large body and long legs. the graph below shows the number of both the mutant and the normal rabbits over 5 generations. which of the following statements is true for this scenario? question 7 options: the rabbits with the mutation were more successful with restricted food than the normal rabbits. both sets of rabbits were equally successful with the restricted food source.i the normal rabbits were more successful with restricted food than the rabbits with the mutation. the graph does not let us know which rabbit was more successful.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above