Exam 2 Flashcards
Person who was convinced of evolution but not natural selection, saw no better theory. Wrote “Evidence as to Man’s Place in Nature”
Thomas Henry Huxley
When was “Evidence as to Man’s Place in Nature” written?
1863
Person who made the biological species concept
Ernst Mayr
Individuals that can reproduce and produce fertile offspring are the same species
Biological species concept
People who discovered DNA (3)
James Watson, Francis Crick, Rosalind Franklin
When did modern genetics begin?
1953
Genetic change in a population over time; A change in gene frequencies in a population over time
Evolution
Thought that fully formed humans were in every sperm and deposited into the uterus and fully formed before it was born
Humunculus
Each parent contributed equally, but they blended together like two buckets of paint; discredited the 19th century idea of hereditary
Blending inheritance
What will wipe out in blending inheritance?
Variability
Darwin’s explanation of inheritance; humans shed body cells called gemmules which collect in the reproductive organs prior to fertilization
Pangenesis
Person who experimented with pea plants, offspring in F1 generation all showed one trait, trait that was not shown in F1 showed up in F2 25% of the time, discovered genes
Mendel
Unit of inheritance which occurs at a specific place on a chromosome that provides information for a specific trait
Gene
What is an example of a gene?
One gene for eye color
Alternate forms of a particular gene at a specific locus
Allele
For every trait, how many alleles do we have?
2
What is an example of an allele?
Gene for eye color that has two alleles, one allele for brown eyes and another for blue eyes
Trait expressed in the F1 generation or the allele that prevents expression of the recessive trait; covers over the recessive gene
Dominant
The train unexpressed in the F1 generation but re-expressed in some members of the F2 generation of the unexpressed allele in the heterozygote
Recessive
Have identical alles for a givene gene
Homozygote