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Chapter 2: Problem 1

Why did Mendel's work refute the idea of blending inheritance?

Short Answer

Expert verified
Mendel's work refuted the idea of blending inheritance by proposing that traits are passed as discrete units, or 'genes', from parents to offspring. His experimental results, showing distinct ratios of trait expression (not blended traits), supported his theories.

Step by step solution

01

Understanding Blending Inheritance

Blending inheritance was a theory that the traits of offspring are a 'blend' or intermediate of the parents' traits. For instance, if one parent is tall and the other short, their offspring would be of medium height. This relies on the idea that traits are mixed in the offspring and result in an intermediate expression.
02

Mendel's Theories

Gregor Mendel proposed an alternate idea, saying that traits from parents are passed on as 'discrete units' (now known as genes), not blended. His two laws, the Law of Segregation and the Law of Independent Assortment, suggest that each offspring takes one gene from each parent for every trait, and these genes retain their individuality from generation to generation.
03

Evidence from Mendel's Experiments

Mendel conducted breeding experiments using pea plants, focusing on several traits that had distinct forms (e.g., flower color could be either purple or white, not a blend of both). His results, showing clear ratios of trait expression among offspring, supported his theories, refuting the idea of blending inheritance, since traits were not blending, but rather appearing intact in predictable proportions.

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Most popular questions from this chapter

With regard to genotypes, what is a true-breeding organism?

On rare occasions, an organism may have three copies of a chromosome and therefore has three copies of the genes on that chromosome (instead of the usual number of two copies). For such a rare organism, the alleles for each gene usually segregate so that a gamete will contain one or two copies of the gene. Let's suppose that a rare pea plant has three copies of the chromosome that carries the height gene. Its genotype is TTt. The plant is also heterozygous for the seed color gene, \(Y y\), which is found on a different chromosome. With regard to both genes, how many types of gametes can this plant make, and in what proportions? (Assume that it is equally likely that a gamete will contain one or two copies of the height gene.)

Describe the difference between genotype and phenotype. Give three examples. Is it possible for two individuals to have the same phenotype but different genotypes?

Do you know the genotype of an individual with a recessive trait and/or a dominant trait? Explain your answer.

What is the difference between cross-fertilization and self-fertilization?
See all solutions

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