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How is Mendel's particulate hypothesis is different from the blending hypothesis of inheritance?
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∙ 8y ago
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.
Chauncey Kihn
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What did Darwin not know about his theory of evolution?
A coherent mechanism of inheritance. His " blending " concept was totally wrong as Mendel showed that inheritance is particulate in nature.
What is the type of inheritance that would suggest the concept of blending?
Blending inheritance is inheritance in which contrasting parental characters appear as a blend in the offspring.
How does Mendel theory of inheritance support Darwins theory of natural selection?
By giving the theory a mechanism of inheritance. Particulate inheritance, where each parent contributes chromosomes ( Mendel dod not know what a chromosome was and called genes " factors " ) that contain separate alleles that contribute to the progeny's traits. Darwin's idea of " blending " inheritance was completely wrong.
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.
What was the major weakness in Charles Darwin's theory during his life time?
The lack of a mechanism to explain how traits were passed to offspring intact when most believed inheritance worked through blending.
Why blending inheritance is an incorrect hypothesis?
because in order for blending inheritance to occur, all variation would have to be diluted out
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.
What did Darwin not know about his theory of evolution?
A coherent mechanism of inheritance. His " blending " concept was totally wrong as Mendel showed that inheritance is particulate in nature.
Why is the process of evolution consistent with a particulate theory of inheritance rather than a blending theory of inheritance?
well what HAPPEN THAT UR FACE IN BUTUS
How do the constancy hypothesis and blending hypothesis for transmission of traits differ from observable patterns of inheritance?
Omg i have the exact question on my packet....
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 is the type of inheritance that would suggest the concept of blending?
Blending inheritance is inheritance in which contrasting parental characters appear as a blend in the offspring.
How does Mendel theory of inheritance support Darwins theory of natural selection?
By giving the theory a mechanism of inheritance. Particulate inheritance, where each parent contributes chromosomes ( Mendel dod not know what a chromosome was and called genes " factors " ) that contain separate alleles that contribute to the progeny's traits. Darwin's idea of " blending " inheritance was completely wrong.
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.
What did Mendel's experiments show about blending inheritance?
Blending inheritance was one hypothesis for how traits were passed from one generation to the next. The idea was that if both parents had different traits for a particular character, then the offspring would exhibit a blend of the two traits. For example, if the character in question is flower petal color, and one parent had white flowers and the other had red flowers, the hypothesis of blending inheritance would predict the offspring would have pink flowers, a blend of the two parent traits. In fact, if you cross red and white flowered plants, you do get a pink flower. However, Mendel was able to show that the inheritance of flower color was particulate, not blending, by going one step further and crossing two pink flowered parents. He found the offspring had a ratio of 1:2:1 for red:pink:white, so the granparents' traits were reappearing. This "skipping of generations" was classically Mendelian: the alleles for red and white were both contained in the pink flowers, so that when they were crossed, they were able to be seen in the offspring. In this case, consider that red flowers have the genotype RR (homozygous for R allele), white flowers have the genotype WW (homozygous for the W allele), and pink flowers have the genotype RW (heterozygous), where R and W are two different alleles for flower color. When red (RR) and white (WW) are crossed, the offspring can only get the R allele from the red parent and the W allele from the white parent, so they are all heterozygous (RW), resulting in a pink color. When two pinks are crossed (RW x RW), then each parent can give either a red allele (R) or a white allele (W) to the offspring, resulting in the following equally likely possible combinations: RW, RR, WW, and WR. Since WR and RW are the same (pink), the expected ratio of offspring is 1 RR: 2 RW: 1 WW. This is considered an example of particulate inheritance, not blending inheritance, because the alleles (particles) are being preserved throughout the generations; it is simply the combinations of alleles that give the appearance of a blending inheritance mechanism when red and white are crossed to produce pink. In classical genetics, the first cross between red (RR) and white (WW) was considered the P (parental) generation. The hybrid offspring produced (RW) were considered the first filial generation (F1). Crossing two F1's shows that the inheritance is particulate, by looking at the 1:2:1 ratio in the F2 generation (1 red: 2 pink: 1 white). Mendel was able to deduce the theory of particulate inheritance by carefully following the generations from P to F1 to F2.
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.
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.
