Concept 7 All cells arise from pre-existing cells.
(1 of 4) Photomicrograph of a cell dividing: nucleus is visible as dark staining organelle
(2 of 4) Cell dividing: chromosomes are visible and lined up at the plane of division.
(3 of 4) Cell dividing: chromosomes are being pulled toward the cellular poles.
(4 of 4) Cell dividing: mother cell divides resulting in two daughter cells each with its own nucleus.
In an effort to preserve and prepare cells for examination, early microscopists used lots of different liquids and chemicals such as alcohol, vinegar, ink and turpentine.
If microscopes and cellular dyes were not available, would it have been possible to develop the chromosomal theory of inheritance?
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(1 of 4) Photomicrograph of a cell dividing: nucleus is visible as dark staining organelle
Children resemble their parents.
Genes come in pairs.
Genes don't blend.
Some genes are dominant.
Genetic inheritance follows rules.
Genes are real things.
All cells arise from pre-existing cells.
Sex cells have one set of chromosomes; body cells have two.
Specialized chromosomes determine sex.
Chromosomes carry genes.
Genes get shuffled when chromosomes exchange pieces.
Evolution begins with the inheritance of gene variations.
Mendelian laws apply to human beings.
Mendelian genetics cannot fully explain human health and behavior.