Bio: Unit 7

Front

What is genetic drift?

Back

Genetic drift is a random change in the frequency of alleles in a population due to chance events, leading to a loss of genetic variation.

Front

What are homologous structures?

Back

Homologous structures are anatomical features in different species that share a common ancestry, indicating evolutionary relationships, such as the similar bone structures in mammals.

Front

What did Darwin propose about organisms with favorable traits?

Back

Darwin proposed that organisms with traits best suited to their environment will increase in number through the process of natural selection.

Front

What is directional selection?

Back

Directional selection is a type of natural selection that favors one extreme phenotype over others, causing a shift in the population's traits.

Front

What structural feature did Darwin study in Galapagos finches?

Back

Darwin focused on the shape and size of the beaks of different finch species, which adapted to their specific feeding habits.

Front

What is gene flow?

Back

Gene flow is the transfer of genetic material between populations, which can increase genetic diversity.

Front

What are analogous structures?

Back

Analogous structures are body parts in different species that serve similar functions but do not share a common ancestry, such as wings of insects and birds.

Front

What are vestigial structures?

Back

Vestigial structures are remnants of organs or structures that had a function in an early ancestor but are reduced or nonfunctional in a modern organism, like the human appendix.

Front

What is natural selection?

Back

Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring.

Front

What is a gene pool?

Back

A gene pool is the total collection of genes and their alleles in a population at a given time.