15 Questions
What was the Moist Vapour Theory proposed by Pythagoras?
Moist vapour theory proposed that each organ of the male body produces moist vapour during coitus, which is responsible for the development of body parts of the embryo. This theory explains why children look like their father and resemble their mother as they grow in the mother's womb.
According to the Fluid Theory proposed by Empedocles, how are body parts formed in the embryo?
The Fluid Theory suggests that the fluid from different body parts of the two parents mixes up and is used in the formation of the embryo. Any defect in the descent and mixing of the fluids can result in missing characters from one or both parents.
What was the Reproductive Blood Theory proposed by Aristotle?
Aristotle proposed that males produce highly purified reproductive blood containing nutrients from all body parts, while females produce impure reproductive blood. This theory attempted to explain the inheritance of traits.
Explain the concept of Germplasm Theory in genetics.
Germplasm Theory states that germ cells carry hereditary information and are responsible for transmitting biological characteristics from parents to offspring. This theory forms the basis of modern genetics.
How did the belief in spontaneous generation influence early theories of inheritance?
The belief in spontaneous generation led to theories attempting to explain how organisms could arise from dead and decaying matter. This influenced early ideas about the transmission of traits from parents to offspring.
What did Friedrich Miescher investigate in 1868, leading to the investigation of DNA?
Cell nucleus
What did Miescher find in the nuclei of pus cells that led to the discovery of DNA?
Nuclein
What two portions did Miescher find nuclein to consist of?
Acidic portion and basic portion
What was the name Friedrich Miescher gave to the phosphorus-containing substance he found?
Nuclein
What did Miescher find in the heads of sperm cells from salmon?
Acidic substance
What was the special stable molecule believed to carry genetic information before DNA was discovered?
Proteins
What did Miescher not know about the covalent nature and structure of nuclein until the 1940s?
Nature and structure
What substance did Friedrich Miescher partially purify and study, leading to the investigation of DNA?
Nuclein
What did geneticists believe might be responsible for carrying genetic information before the discovery of DNA?
Special stable molecule
What was the acidic portion of nuclein, discovered by Friedrich Miescher?
DNA
Learn about the theory proposed by August Weismann which suggests that physiological changes acquired during an organism's lifetime can be passed on to its offspring. Explore the concept of inheritance of acquired characters and its implications in evolution.
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