The bicoid is characterized as a coordinate, maternal effect gene. Based on this, answer the following: Determine the phenotype of the progeny produced from the cross between female Drosophila heterozygous for a loss of function bicoid allele and male that is heterozygous for the same allele. Determine the phenotype of progeny produced from a cross between a female that is homozygous for a loss of function bicoid allele and a wild type male. Provide an explanation on, if losses of bicoid function in the egg results in lethality during embryogenesis how are females homozygous for bicoid produced. Also determine phenotype of a male homozygous for bicoid loss of function alleles. Introduction: Bicoid is an example of a maternal effect gene. The phenotype result from maternal effect gene is identified by the mother genotype and not by the organism phenotype. This is because the egg receives protein and mRNA needed for proper development from the mother for the determination and development of a body axis in an organism. Bicoid is essential, thus, it is also termed as axis determination gene.

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Chapter 18, Problem 13P

Summary Introduction

To analyze:

The bicoid is characterized as a coordinate, maternal effect gene. Based on this, answer the following:

Determine the phenotype of the progeny produced from the cross between female Drosophila heterozygous for a loss of function bicoid allele and male that is heterozygous for the same allele.

Determine the phenotype of progeny produced from a cross between a female that is homozygous for a loss of function bicoid allele and a wild type male.

Provide an explanation on, if losses of bicoid function in the egg results in lethality during embryogenesis how are females homozygous for bicoid produced. Also determine phenotype of a male homozygous for bicoid loss of function alleles.

Introduction:

Bicoid is an example of a maternal effect gene. The phenotype result from maternal effect gene is identified by the mother genotype and not by the organism phenotype. This is because the egg receives protein and mRNA needed for proper development from the mother for the determination and development of a body axis in an organism. Bicoid is essential, thus, it is also termed as axis determination gene.

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