Biology
Biology
10th Edition
ISBN: 9780321794260
Author: Audesirk, Teresa/ Audesirk
Publisher: Pearson College Div
Question
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Chapter 10, Problem 1FIB
Summary Introduction

Introduction:

The DNA act as a genetic material which carries information that passes to the next generation. The DNA includes genes and every gene contains a pair of alleles. The DNA present in the nucleus divided into chromosomes (a long strand of DNA).

Expert Solution & Answer
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Answer to Problem 1FIB

Correct answer:

The physical position of a gene on a chromosome is called its locus. Alternative forms of a gene are called alleles. These alternative forms of genes arise as mutations, which are changes in the nucleotide sequence of a gene.

Explanation of Solution

DNA is a long strand structure which is present in form of the chromosome in the nucleus of cells. In DNA many genes are present, which gets translated into specific proteins. The physical position of a gene in the chromosome is called as locus.

Allele is the alternate form of the gene which means the gene has at least two variations. The variation of a gene can be more than two. The allele occupies the same position on the homologous chromosome and often classified as recessive or dominant.

The different alleles present on the chromosomes are inherited from both parents (mother and father). These alleles are arising from mutations. Mutations cause the change in DNA nucleotide sequences. If a mutation occurs in germ cells then it can be passed from one generation to another

Conclusion

The physical position of a gene is called locus. Alternative form of a gene is called as alleles. These alleles are arising due to mutation.

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Alleles at the P locus control seed color. Plants which are pp have white seeds, white flowers and no pigment in vegetative parts. Plants which are P_ have black seeds, purple flowers and may have varying degrees of pigment on stems and leaves. Seed color can be assessed, visually, based on if the seed is white or not white A gene for mold resistance has been reported and we want to determine its inheritance and whether it is linked to P. For the purposes of this exercise, we will assume that resistance is controlled by a single locus M, and M_ plants are resistant and mm plants are susceptible.  Resistance can be measured, under greenhouse conditions, 2 weeks after planting, by injecting each seedling with a spore suspension. After two weeks, the seedlings can be rated as resistant or susceptible, based on whether or not tissue is actively sporulating. For this exercise we will use seed and data from the F10 generation of a recombinant inbred population produced using single seed…
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