Two different strains of Drosophila melanogaster are mated in reciprocal crosses. When strain A males are crossed with strain B females, the progeny are normal. However, when strain A females are crossed with strain B males, there are many mutations and chromosome rearrangements in the gametes of the F1 progeny, and the F1 generation is effectively sterile. Explain these results.

Q: One of the X chromosomes in a particular Drosophila female had a normal order of genes but carried…

A: Crossing over: It occurs during prophase I and involves the exchange of genetic material between…

Q: Please help a bit confused

A: STR is defined as the Short tandem repeats, also known as microsatellites or simple sequence…

Q: aternal effect gene in Drosophila, called torso, is found as a recessive allele that prevents the…

A:

Q: n Drosophila, vermilion eye color is due to a recessive allele (v) located on the X chromosome.…

A: assuming that  : The wild type = allele+ / allele+ Heterozygote = allele+ / allele Mutants = allele…

Q: The genes dumpy (dp), clot (cl), and apterous (ap) are linked on chromosome II of Drosophila. In a…

A: Recombination frequency measures the genetic linkage between a set of alleles/genes and is used to…

Q: One of the X chromosomes in a particular Drosophila female had a normal order of genes but carried…

A: Inversion usually occurs in the prophase 1 in which two break can occur in the area and can thus…

Q: Miniature wings (Xm) in Drosophila result from an X-linked allele that is recessive to the allele…

A: Alleles are the alternative forms of a gene. Allele can be dominant or recessive.

Q: In Drosophila, a heterozygous female for the X-linkedrecessive traits a, b, and c was crossed to a…

A: X-linked recessive inheritance is a genetic condition that can be passed from parent to child…

Q: In Drosophila, Dichaete (D) is a mutation on chromosome III with a dominant effect on wing shape. It…

A: Interlocus distance refers to the distance between two genes on a chromosome. In order to determine…

Q: Miniature wings (Xm) in Drosophila result from an X-linked allele that is recessive to the allele…

A: Since, no specific subparts have been asked to be answered, the first three have been answered here.…

Q: In Drosophila, Lyra (Ly) and stubble (Sb) are dominant mutations located at locus 40 and 58, on…

A: "Genetic variation" is the result of the recombination of genetic material during the inheritance…

Q: In a series of two-point map crosses involving five genes locatedon chromosome II in Drosophila, the…

A: Recombination frequency measures the genetic linkage between a set of alleles/genes and is used to…

Q: In a series of two-point map crosses involving five genes locatedon chromosome II in Drosophila, the…

A: There are five genes in Drosophila's chromosome II and the crosses yield offspring with different…

Q: In Neurospora, a mutant strain called stopper (stp) arose spontaneously. Stopper showed erratic…

A: The genes are the hereditary unit of an organism which are passed on from the parental generation to…

Q: heterozygous female and  a recessive male. From the offspring, backcross the recessive female with…

A: introduction  In mutagenesis evaluates for latent female sterile changes on the second chromosome of…

Q: In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal phenotype…

A: Genes are the basic units of heredity. The study of heredity is called Genetics. A gene has two…

Q: Explain why inversions and reciprocal translocations do not usually cause a phenotypic effect. In a…

A: in this, no addition or removal of genetic material is done there is a relative change in the…

Q: The genes dumpy wings (dp), clot eyes (cl), and apterous wings (ap) are linked on chromosome II of…

A: The process of establishing or identifying the position of the genes on the genome is termed genome…

Q: In Drosophila, the gene loci for curved wings and purple eyes are 20 centimorgans (map units) apart…

A: When two genes present on the same chromosome, they are called as the linked gene and their…

Q: In Drosophila, Dichaete (D) is a mutation on chromosome III with a dominant effect on wing shape. It…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal  phenotype…

A: Given  Recessive mutation = m-  Normal gene = m+  homozygous female(m-m-) egg can't support…

Q: Approximately how many copies of chromosome 2 are found in a polytene chromosome in Drosophila?

A: Polytene chromosomes are special type of chromosomes, which have thousands of DNA strands. They…

Q: You design Drosophila crosses to provide recombinationdata for gene a, which is located on the…

A: The drosophila is commonly called fruit fly, and it is commonly used for the study of genetics. The…

Q: One of the X chromosomes in a particular Drosophila female had a normal order of genes but carried…

A: To determine : a. Why are there no male offspring with the allele combinations y v f+, v+ v+ f, y v+…

Q: In Drosophila, three autosomal genes have the following map:20 m.u. 10 m.u.a b ca. Provide the data,…

A: Gene mapping is the way in which a genetic map is designed that will use recombination frequency…

Q: The mutations called bobbed in Drosophila result from variable reductions (deletions) in the number…

A: Mutations known as bobbed results from varied deletions in the number of amplified rRNA coding…

Q: In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal  phenotype…

A: Alleles are the alternative forms of a gene, that can occupies the same locus of a homologous…

Q: If genes a and b are 30 m.u. apart, what percentage of the gametes produced by an AaBb individual…

A: In a allele the distance between two gene a and b is 30 map unit. That's mean the recombinant…

Q: A female Drosophila with the mutant phenotype 'notched wings' was mated to a wild type male.…

A: Drosophila melanogaster is a fly species that belong to order Diptera. This is also known as fruit…

Q: In Drosophila, the genes ct(cut wing margin), y (yellow body), and v (vermilion eye color) are…

A: Crossing over of chromosome during meiosis is normal process occurring so that there can be…

Q: The locations of six deletions have been mapped to a Drosophila chromosome, as shown in the…

A: Mutation is an abrupt change in the DNA sequence and nucleotide base pairs.  Mutation is caused by…

Q: The locations of six deletions have been mapped to a Drosophila chromosome, as shown in the…

A: we have a set of overlapping deletions which is to be used to put in order a set of mutants. this is…

Q: What kind of chromosomal mutations is/are produced by unequal crossing over?

A: Chromosome mutations are changes that arise in chromosomes as a result of nuclear division mistakes…

Q: The recombination frequency between purple color and large wings in Drosophila is 10%. What can we…

A: To answer this question you should understand linkage and recombination.If two genes are located on…

Q: Vermillion eye color in Drosophila sp. is a sex-linked recessive trait. What  phenotype would be…

A: Considering XvXV as  Vermilion eye coloured female the crossing is given as follows. The phenotype…

Q: Three recessive mutations in Drosophila melanogaster, roughoid (ru, small rough eyes), javelin (jv,…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: The genes dumpy wings (dp), clot eyes (cl), and apterous wings (ap) are linked on chromosome II of…

A: A genetic map is a type of chromosome map that shows the relative locations of genes and other…

Q: In Drosophila, the genes for eye color, wing shape, and wing length are located on chromosome II.…

A: It is given that the Purple eyes (pr), arc bent wings (a), and vestigial wings (vg) are the mutant…

Q: In Drosophila, the genes for withered wings (whd), smooth abdomen (sm) and speck body (sp) are…

A: To calculate the expected number of double crossover, we have to use the product rule. The product…

Q: why two crossovers are needed on one chromatid arm?

A: Crossing over or chromosomal crossover is the process where exchange of genetic material happens…

Q: A normal chromosome A B C D * E F G H I J K has mutated to A B C F E * D G H I J K J K. This is an…

A: Considering the genes DEF, there is inversion in the order of the genes. Also, the inversion…

Q: A female from a pure-breeding strain of Drosophila with vermillion-colored eyes is crossed with a…

A: The genes are the hereditary unit of an organism which are passed on from the parental generation to…

Q: The genes for mahogany eyes and ebony body are approximately 18 map units apart on chromosome III in…

A: In Drosophila + indicates wild-type allele for any gene, m = mahogany  e = ebony.Female parents are…

Q: Vermilion eye color in Drosophila is sex-linked and recessive. What would be the phenotypes of male…

A: Vermilion eye color in Drosophila is a sex-linked and recessive characteristic.  This sex-linked…

Q: In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal  phenotype…

A:

Q: A new recessive mutant allele doesn’t show pseudodominance with any of the deletions that span…

A: Pseudodominance is defined as the sudden appearance of the phenotype of a recessive gene in a…