To draw: The diagram of chromosomes that help in generating clones in the given problem. Introduction: It is given that researchers have manipulated Minute mutations to study the phenotypes that are linked to recessive lethal mutations ( l - ). These mutations reduce the rate of cell division and make very tiny homozygous mutant clones that cannot be analyzed easily.

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Chapter 18, Problem 15P

Summary Introduction

To draw:

The diagram of chromosomes that help in generating clones in the given problem.

Introduction:

It is given that researchers have manipulated Minute mutations to study the phenotypes that are linked to recessive lethal mutations (l^-). These mutations reduce the rate of cell division and make very tiny homozygous mutant clones that cannot be analyzed easily.

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In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal phenotype wherein homozygous (m-m-) females produce eggs that cannot support embryonic development. Homozygous (m-m-) males, however, can still produce viable sperm. Using m+ to denote a normal gene, determine the genotypes and phenotypes of the F1s produce by a cross between a heterozygous female and a recessive male. From the offspring, backcross the recessive female with the paternal strain. 1. What are the genotypes and phenotypes of the F2s? 2. If m-m- females produce useless eggs, then how are m-m- produced?

In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormalphenotype wherein homozygous (m-m-) females produce eggs that cannot support embryonicdevelopment. Homozygous (m-m-) males, however, can still produce viable sperm. Using m+ todenote a normal gene, determine the genotypes and phenotypes of the F1s produce by a crossbetween a heterozygous female and a recessive male. From the offspring, backcross the recessivefemale with the paternal strain. What are the genotypes and phenotypes of the F2s?