Bio 2200 Exam 1 Questions & answers

Bio 2200 Exam 1
age of the earth - ANS-4 1/2 - 5 billion years

oldest rock - ANS-4 billion years old

RNA - ANS-first form of life

first fossils - ANS-2.5 billion years (unicellular algae)

mitochondria into eukaryotes via endosynthesis - ANS-1.8 billion years ago

chloroplasts into eukaryotes - ANS-1.5 billion years ago

diploidy in animals - ANS-5-600 million years ago

diploidy in plant lineage - ANS-400 million years ago

dinosaurs/abundant first mammals - ANS-150-200 million years ago

flowering plants - ANS-100 million years ago

simple life cycle - ANS-haploid cells increase in number by mitosis. haploid cells fuse to
form a diploid cell that undergoes meiosis.

segregation - ANS-how genes are distributed in meiosis

genetic ratio - ANS-reflect the process of meiosis considered from the viewpoint of
various types of gametes in a population of individuals form a cross

gene - ANS-the basic unit of inheritance

genotype - ANS-genetic constitution of each individual

phenotype - ANS-appearance of an organism as a result of the genotype