Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 18.6, Problem 2CC
Summary Introduction

To design: A testcross to determine the distance between the al and dp genes.

Introduction: The hereditary characters are determined by DNA sequences called genes. The study of the arrangement of genes and the distance between them on the genome of an organism is called genetic mapping.

Summary Introduction

To determine: The genotypes of P, F1.and F2 generation in the test cross.

Introduction: Genes are the sequences of DNA in the genome that are responsible for the hereditary characters being passed on from generation to generation. With the use of genetic mapping, the arrangement and location of genes on the chromosome can be understood.

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A maternal effect gene in Drosophila, called torso, is found as a recessive allele that prevents the correct development of anterior- and posterior-most structures. A wild-type (homozygous) male iscrossed to a female of unknown genotype. This mating produces 100% larva that are missing theiranterior- and posterior-most structures and therefore die during early development. What is the genotype and phenotype of the female fly in this cross? What are the genotypes andphenotypes of the female fly’s parents? Show COMPLETE cross.   Maternal genotype:Paternal genotype:F1 genotype:F1 phenotype:
The genetic map was based on crosses in Drosophila involving the three sex-linked genes a, b and c. “a” gives red eyes, “b” gives normal wings and “c” gives black body. The recombination frequencies between these genes are as follows; a and b is 23.8, b and c is 2.6 and a and c is 28.1, respectively.  Could you draw a basic genetic map based on distance between these genes using dots to show distance(s)? Could you make one fundamental comment using these distances based on genetic linkage?
In tomato plants, the genes for fruit colour (C), fruit fructose content (F), fruit length (L), and plant height (H) are all found on chromosome 4. Map distances between the four genes are shown below.    Genes Distance in Map Units H and F  40 F and L  12 C and F 75 L and C  87 L and H  52   Sketch and label a gene map to identify the order of the four genes on chromosome 1 in tomato plants.
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