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Oxford University Press - Online Resource Centres

Stearns & Hoekstra: Evolution 2e

Chapter 15


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Question 01

RNA is thought to have been the primitive carrier of hereditary information rather than DNA, for which reason?

Question 02

What is Eigen's paradox?

Question 03

The genetic code is (nearly) the same in all investigated organisms. Therefore, life must have had a single origin. True or false?

Question 04

Is it likely that DNA has started to replace RNA as the carrier of genetic information after mRNA had evolved?

Question 05

Why did chromosomes evolve?

Question 06

Eukaryotes differ from prokaryotes in at least the following key features.

Question 07

From what types of ancestors are mitochondria and chloroplasts derived?

Question 08

In the course of evolution almost all genes from mitochondria and chloroplasts have moved to the nucleus. What is the probable reason that still a small number of genes have been kept in the organellar genomes?

Question 09

A plausible reason for the origin of cell clusters as a first step to multicellularity is.

Question 10

The germline-soma distinction (early and absolute developmental separation of reproductive and non-reproductive cells) is found:

Question 11

Do key evolutionary events often involve: (1) Previously independent units joining a larger whole, thereby losing their independence, or (2) Functional specialization: tasks previously carried out by a single unit become distributed over different and partly independent units?

Question 12

What is the most likely reason why natural selection has produced reproductive systems in which offspring start developing from a single cell?

Question 13

Why is cooperation between relatives easier to understand than cooperation between unrelated individuals?

Question 14

What is epigenetic inheritance?

Question 15

The eukaryote cell has probably evolved from: