Orthogenesis- “Straight-line evolution,” held that the variation that arises is directed toward fixed goals.

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#Id: 4308

#Unit 11. Evolution and Behavior

Haldane’s rule: hybrid sterility or hybrid inviability is often limited to the heterogametic sex. (The heterogametic sex is the one with two different sex chromosomes, while the homogametic sex has two sex chromosomes of the same type).

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#Id: 8226

#Unit 2. Cellular Organization

I-cell disease

• almost all of the hydrolytic enzymes are missing from the lysosomes of many cell types.

• mis-sorting has been traced to a defective or missing GlcNAc phosphotransferase.

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#Id: 3628

#Unit 3. Fundamental Processes

The genetic code, in effect, is defined by two elements:

(1) the anticodons on tRNAs

(2) the specificity of the enzymes.

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#Id: 3972

#Unit 2. Cellular Organization

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#Id: 4584

#Unit 6. System Physiology – Plant

The initial observation was that the germination of lettuce seeds is stimulated by red light and inhibited by farred light.