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Chapter 5: Problem 33

Describe how a biparental pattern of extranuclear inheritance would resemble a Mendelian pattern of inheritance for a particular gene. How would they differ?

Short Answer

Expert verified
A biparental pattern of inheritance and a Mendelian pattern of inheritance would resemble each other in the sense that both involve the contribution of genes from both parents to an offspring. However, they differ in the sense that Mendelian inheritance follows strict laws of segregation and independent assortment, which may not be the case for biparental inheritance since traits can be influenced by multiple genes, gene-environment interactions, and do not always show dominant and recessive characteristics.

Step by step solution

01

Understanding Biparental Inheritance

In biparental inheritance, traits are passed on to offspring from both parents. This includes traits for which both parents contribute equal proportions of genetic material, such as with autosomal chromosomes.
02

Understanding Mendelian Inheritance

In Mendelian inheritance patterns, traits are passed on based on the laws of segregation and independent assortment. This means that each parent contributes one allele for each gene, and each gene-assort independently during gamete formation.
03

Describing the Resemblance

A biparental pattern might resemble a Mendelian pattern in that both patterns involve the contribution of genes from both parents. In both cases, the offspring inherit genes from their parents and those genes can influence their traits.
04

Describing the Difference

However, they might differ in the sense that, Mendelian inheritance strictly follows the law of segregation and independent assortment, which is not always the case with biparental inheritance. For example, in biparental inheritance, traits can be influenced by multiple genes(at multiple loci), environment interactions, and do not always show dominant and recessive characteristics.

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Most popular questions from this chapter

On rare occasions, a human male is born who is somewhat feminized compared with other males. Microscopic examination of the cells of one such individual revealed that he has a single Barr body in each cell. What is the chromosomal composition of this individual?

Explain why maternal effect genes exert their effects during the early stages of development.

Suppose a maternal effect gene exists as a functional dominant allele and a nonfunctional recessive allele. A mother who is phenotypically abnormal produces all normal offspring. Explain the genotype of the mother.

When does the erasure and reestablishment phase of genomic imprinting occur? Explain why it is necessary to erase an imprint and then reestablish it in order to always maintain imprinting from the same sex of parent.

Describe the inheritance pattern of maternal effect genes. Explain how the maternal effect occurs at the cellular level. What are the expected functional roles of the proteins that are encoded by maternal effect genes?
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