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What important element of evidence or observation did Darwin's theory of evolution lack?
A mechanism of heredity. Darwin's concept, panspermia, was based on a blending of factors he called gremules that originated with either sex and were in the blood. This was shown to be completely wrong by Mendel's work on particulate inheritance.
Explain how Mendel's particulate hypothesis is different from the blending hypothesis of inheritance?
Mendel showed in his experiments that inherited traits are not passed through the blending of inheritance theory. According to the blending of inheritance theory, an offspring's traits are a blend between the traits of the parent organisms. In Mendel's experiments however, he showed that this was not true, and that inheritance is actually based on genes, through the observation of recessive traits. He observed that an offspring could have a trait that neither of the parents had, which is now explained through both of the parents having the recessive gene for the trait, but not showing it because they are heterozygous dominant. There is a 25% chance that the offspring of two heterozygous dominant parents will produce a homozygous recessive offspring that will show the trait that neither of the parents shows.
Is blending food a physical or chemical change?
Blending food is considered a physical change rather than a chemical change. In blending, the food is physically broken down into smaller pieces, but its chemical composition remains the same. No new substances are formed during blending, so it does not involve a chemical reaction.
Is A before blending cake ingredients a solution or a mixture?
It is a mixture
What factor contributes to cultural change over time?
Blending cultures.
What is the type of inheritance that would suggest the concept of blending?
Blending inheritance suggests a type of inheritance where the traits of the parents are mixed together in the offspring, resulting in an intermediate phenotype. This concept contrasts with the idea of particulate or Mendelian inheritance, where discrete units (alleles) are passed from parents to offspring without blending.
What did Darwin not know about his theory of evolution?
Darwin did not know about the role of genetics in inheritance, as Gregor Mendel's work on inheritance was not known to Darwin in his lifetime. Additionally, he did not have knowledge of the mechanism of heredity through DNA and genes.
What knowledge did Darwin lack that scientist now use to explain evolution?
Darwin lacked a sensible mechanism of heredity. His concept of blending was so off the mark that a Scottish engineer showed that evolution could not take place with the mechanism Darwin proposed. Mendel's concept of particulate inheritance was the correct solution to this problem.
Was genetic basis for variations included in Darwins theory of evolution?
No. Darwin had no idea of what a gene was and did not even know that inheritance is particulate. He held with a " blending " idea called panspermia that was totally incorrect. Mendel, by mathematical analysis, found that heritability was based on the particulate " factor. " Today we call these " factors " genes.
Why the blending hypothesis rejected as the method of inheritance?
The blending hypothesis was rejected as the method of inheritance because it could not explain the observed patterns of inheritance, especially the reappearance of traits in later generations that were not visible in the immediate offspring. Additionally, the blending hypothesis does not account for the variation observed in offspring that is more consistent with the principles of Mendelian genetics.
How did both Darwin and Wallace fail to understand natural selection?
Both failed to understand the mechanism of inheritance. Darwin had a mistake " blending " idea and Wallace seemed to go along with this concept, though inheritance is particulate.
What important element of evidence or observation did Darwin's theory of evolution lack?
A mechanism of heredity. Darwin's concept, panspermia, was based on a blending of factors he called gremules that originated with either sex and were in the blood. This was shown to be completely wrong by Mendel's work on particulate inheritance.
Explain how Mendel's particulate hypothesis is different from the blending hypothesis of inheritance?
Mendel showed in his experiments that inherited traits are not passed through the blending of inheritance theory. According to the blending of inheritance theory, an offspring's traits are a blend between the traits of the parent organisms. In Mendel's experiments however, he showed that this was not true, and that inheritance is actually based on genes, through the observation of recessive traits. He observed that an offspring could have a trait that neither of the parents had, which is now explained through both of the parents having the recessive gene for the trait, but not showing it because they are heterozygous dominant. There is a 25% chance that the offspring of two heterozygous dominant parents will produce a homozygous recessive offspring that will show the trait that neither of the parents shows.
How is Mendel's particulate hypothesis is different from the blending hypothesis of inheritance?
The blending hypothesis, but not the particulate hypothesis, maintained that after a mating, the genetic material provided by each of the two parents is mixed in the offspring, losing its individual identity.
Did the scientists of Darwin's time know how hereditary changes takes place?
No. Generally, people believed in blending inheritance ie something from each parent blended or mixied together in the offspring. The fact that inheritance is particulate ie particles (now called genes) are passed from parent to offspring and remain separate from each other, was not known until Mendel carried out his experiments on inheritance in pea plants.
How did Mendel explain his theory's apparent conflict with Darwin's recent accepted theory of evolution.... What did he mean?
He was at a meeting in his home country and he was explaining his laws of heredity when someone mentioned that this was contra-Darwin. Mendel stood his ground and said Darwin was wrong here. Darwin had a mechanism of heredity that was pure speculation ( and he admitted that ) and very wrong. Mendel, mathematically and experimentally showed the laws of inheritance and showed it was particulate and not a blending of the traits.
Why blending inheritance is an incorrect hypothesis?
Blending inheritance is considered incorrect because it suggests that offspring inherit a mix of parental traits that blend together, leading to a loss of variation across generations. In reality, inheritance is controlled by discrete units of heredity (genes) that are passed on intact from parents to offspring. This mechanism allows for the preservation of genetic variability within populations.
