Chapter 7.3, Problem 30AQP

a.

Summary Introduction

To determine:

The order of these genes on the chromosomes.

Introduction:

Interference is a genetic term that is used in crossover. It is used to measure the degree by which one crossover is interfering with additional crossovers. The coefficient of coincidence is the ratio that is obtained by the division of the number of observed double cross over to a number of expected double crossovers. Waxy endosperm (wx), shrunken endosperm (sh), and yellow seedling (v) are encoded by three recessive genes in corn that are linked on chromosome number 5. A corn plant, that is homozygous for all three recessive alleles, is crossed with a corn plat that is homozygous for all three dominant allele in a three point test cross.

b.

Summary Introduction

To determine:

The map distance between the genes.

Introduction:

The average number of marks of the exchange taking place in the particular section is called the map distance between the parts of the two loci. The recombination frequency is the relative frequency of the crossovers of the two genes. This estimated recombination frequency is used for the calculation of the map distance.

c.

Summary Introduction

To determine:

The coefficient of coincidence and inference among the genes.

Introduction:

Interference is a genetic term that is used in crossover. It is used to measure the degree by which one crossover is interfering with additional crossovers. The coefficient of coincidence is the ratio that is obtained by the division of the number of observed double cross over to a number of expected double crossovers.