WHMIS, Genetics, and Evolution Overview

WHMIS

Workplace Hazardous Materials Information System.

Hazard classes under HPA

Compressed Gas (A), Flammable (B), Oxidizing (C), Poisonous (D), Corrosive (E), Reactive (F).

MSDS

Material Safety Data Sheets.

Contents of MSDS

Product Identifier, Ingredients, Hazards, First Aid.

Gregor Mendel's study

Genetics.

Mendel's laws

Dominance, Segregation, Independent Assortment.

Allele

Alternative versions of a trait.

Diploid

Two sets of chromosomes, one from each parent.

Dominant allele

Allele that masks others.

Recessive allele

Allele with no noticeable effect when dominant allele present.

Genotype

Organism's genetic makeup.

Phenotype

How an organism 'looks,' its traits.

Homozygous

Same alleles (PP, pp).

Heterozygous

Different alleles (Pp).

Law of segregation

Alleles segregate during meiosis.

Segregation location

Metaphase 1.

Dihybrid cross

Inheritance of 2 characters. Ratio is 9:3:3:1.

Law of independent assortment

Genes assort into gametes independently.

Exception to independent assortment

Linked genes.

Charles Darwin

Studied evolution, especially finches.

Year of 'Origin of Species' publication

1859.

Lamarck's contribution

Theory of inheritance of acquired characteristics.

Malthus's contribution

Idea of competition for resources.

Artificial selection

Humans select useful variations.

Selective breeding

Breeding for desired traits.

Variation

Differences within a population.

Causes of variation

Mutation and recombination.

Biodiversity

Variety of species in a community.

Niche

Population's habitat and role.

Adaptation

Inherited trait increasing survival.

Survival of the fittest

Best suited individuals survive and reproduce.

Descent through modification

Organisms change and differ from ancestors.