Studied by 5 people
Define crossing over. When does it occur?
Crossing over is the exchange of DNA material between nonsister homologous chromatids
When do chromosomes replicate?
In the S phase of Interphase
What does crossing over produce?
Crossing over produces new combinations of alleles on the chromosomes of the haploid cells
What can chiasmata formation result in?
Chiasmata formation between non-sister chromatids can result in an exchange of alleles
When do homologous chromosomes separate?
In Meiosis 1 (Anaphase 1)
When do sister chromatids separate?
In Meiosis 2 (Anaphase 2)
What causes Independent Assortment?
Independent assortment of genes is due to the random orientation of homologous chromosomes in meiosis 1
When are gene loci said to be linked?
Gene loci are said to be linked if on the same chromosome
How do unlinked genes segregate?
Unlinked genes segregate independently as a result of meiosis
Variation can be 2 things
Discrete or continuous
What do the phenotypes of polygenic characteristics tend to show?
The phenotypes of polygenic characteristics tend to show continuous variation
What are chi-squared tests used to determine?
Chi-squared tests are used to determine whether the difference between an observed and expected frequency distribution is statistically significant
What does a gene pool consist of?
A gene pool consists of all the genes and their different alleles present in an interbreeding population
What does evolution require?
Evolution requires that allele frequencies change with time in populations.
What are the types of reproductive isolation?
Behavioral, geographic, temporal
Speciation due to divergence of isolated populations can be
Gradual
Speciation can also occur
Abruptly
