Question

In sweet pea plants, purple flower color is dominant over red flower color and long pollen grain shape is dominant over round pollen grain shape. Two sweet pea plants that are heterozygous for both flower color and pollen grain shape are crossed with one another. A geneticist is surprised to observe that there are far fewer round, purple offspring and long, red offspring than were predicted by the 9:3:3:1 expected phenotypic ratio. Which of the following statements provides the most reasonable prediction to account for the deviation from the expected results?.

Answer 1

The most reasonable prediction to account for the deviation from the expected results is: in sweet pea plants, the gene for flower color and the gene for pollen grain shapes are genetically linked.

Who is the Father of Genetics?

Gregor Mendel is known as the Father of Genetics, as he established the principles governing the:

• Laws of independent assortment,
• Dominance, and
• Segregation of genes.

However, certain exceptions to these principles exist, such as genetic linkage, which is an example of an exception to the law of independent assortment.

What is Genetic Linkage?

Genetic Linkage is the likelihood for genes or fragments of DNA adjacent together via chromosome to segregate simultaneously at meiosis and hence be inherited together.

The outcome of the parameters given can be interpreted as follows:

• According to the Law of Independent Assortment, we need to know that two or more alleles of distinct genes assort separately or independently.

• The genetic linkage takes place in the provided scenario, but it does not match the 9:3:3:1 ratio. This is because the genetic linkage does not obey the principles of independent assortment, hence, fewer purple offspring are produced.

• As a result, mutations can cause Mendel laws to fail and have an effect on an organism's phenotypic features.

Learn more about Genetic Linkage here:

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