Darwin was able to formulate his theory of evolution based on several facts. Which of the following facts was unavailable to Darwin in the mid-nineteenth century?
Natural resources are limited.
Individual organisms in a population are not alike.
Characteristics are inherited as genes on chromosomes.
Most populations are stable in size.
All populations have the potential to increase.
I was thinking that it was "Characteristics are inherited as genes on chromosomes."
I agree.
http://www.biologie.uni-hamburg.de/b-online/e11/11.htm
Thank you!
You are correct. Darwin was indeed unaware of the fact that characteristics are inherited as genes on chromosomes. This particular understanding came much later after Darwin's time, with the discovery of DNA and the development of the field of genetics.
To arrive at this answer, you can break down and analyze each statement individually:
1. Natural resources are limited: This concept was acknowledged by Darwin and played a crucial role in his theory of evolution. He recognized that there is competition for limited resources, leading to the struggle for survival and differential reproductive success.
2. Individual organisms in a population are not alike: Darwin observed variation among individuals within populations, which is a key element in the process of natural selection. This variation allows some individuals to be more successful in adapting to their environment and passing on their traits to the next generation.
3. Characteristics are inherited as genes on chromosomes: This concept was not known to Darwin. The understanding of how traits are inherited and the role of genes on chromosomes in this process was only achieved through later scientific advancements, particularly in genetics.
4. Most populations are stable in size: Darwin recognized that populations tend to grow exponentially if resources are abundant. However, he also acknowledged that populations typically stabilize around a certain size due to resource limitations and other factors.
5. All populations have the potential to increase: Darwin observed that populations have the potential to increase, but he also recognized that this potential is constrained by limiting factors such as limited resources and environmental pressures.