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

Q: A rosy-eyed Drosophila was crossed with a forked bristle Drosophila. The F1 were all wild-type while…

A: The correct answer is b) RrFf x RrFf. Here's how we can arrive at this conclusion:Analysis of the…

Q: Consider two loci A and B that are 30 cM apart on chromosome 1 in the fruit fly. A paracentric…

A: There are two types of inversions. The paracentric and pericentric. In a paracentric inversion,…

Q: Please label the tetrad type in the table as PD (parental ditype), NPD (non parental ditype) or T…

A: Tetrad analysis:  The tetrad analysis is usually done to determine the distance between the genes…

Q: were observed and used to make a map of these genes.  Calculate the interference.…

A: Answer. The linkage of the genes in a chromosome can be in the form of a genetic map or linkage map.…

Q: Imagine Drosophila genes C, D, and E are autosomal genes located close to each other on the same…

A: If many genes are located on the same chromosome then the crossing over between them will be reduced…

Q: Consider the first category of test-cross offspring shown in figure 8.2 (+b, LS). Consider also that…

A: In the test-cross in question, heterozygous female flies with the genotype +b, LS were used. In…

Q: The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by a recessive…

A: It is given that the vestigial wing and hairy body are caused by recessive wings. These are encoded…

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: Cinnabar eyes (cn) and reduced bristles (rd) are linked autosomal recesive characters in Drosophila…

A: According to the question, The given cross is, cn+cn+rd+rd+ (wild type female) X   cncnrdrd (reduced…

Q: You are mapping three linked loci in Drosophila melanogaster (the common laboratory fruit fly). You…

A: The fruit fly Drosophila is commonly associated with genetics due to the dominance of post-Mendelian…

Q: Coat color in cats is determined by genes at several different loci. At one locus on the X…

A: An organism has phenotype and genotype. Phenotype is the observable characteristics and genotype is…

Q: Cross Cross A Cross A Cross B Cross B Phenotype F1 generation F2 generation F1…

A: The objective of the question is to determine the genotypes of the flies in different crosses and…

Q: Consider two maize plants:a. Genotype C/c m ; Ac/Ac+, where cm is an unstable allele caused by a Ds…

A: Ac and C are unlinked, that the chromosome-breakage frequencyis negligible, and that mutant c /C is…

Q: Fruit flies express both normal wing shape and vestigial wing shape. The pedigree shows the…

A: Introduction :- Vestigial organs are organs that have no obvious function and are thought to be…

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: A Drosophila strain with two mutated phenotypes was crossed with a wild-type Drosophila strain. The…

A: Law of independent assortment state that two different allele assorts independent from one other.…

Q: A cross between yeast strains ab x AB produces the following unordered tetrad a. Label each group of…

A: Tetrad analysis is a powerful tool for studying genetic linkage and recombination in yeast. By…

Q: In Drosophila, the allele for red eyes (p*) is wild-type and the allele for purple eyes (p") is…

A: Mendel's principle of independent assortment states that a dihybrid cross with unlinked markers…

Q: A mutation of Drosophila has a wing condition known as beaded. When a beaded fly was crossed with a…

A: The wildtype flies have long and full wings. The mutated flies have beaded wings that can be due to…

Q: 4) You design Drosophila crosses to provide recombination data for gene (A), which is located…

A: The location of genes on a particular chromosome can be determined on the basis of recombination…

Q: Consider three genes on the same chromosome, Gene A, Gene B and Gene C. You perform three factor…

A: As 3 genes are located on the same chromosome then the crossing over event is very rare.

Q: |You are studying three traits in a goldfish variety; body colour (A or a), tail length (B or b) and…

A: Part B. A true breeding gold fish with long curly tail is crossed with a true breeding gold fish…

Q: Male Drosophila from a true-breeding wild-type stock were irradiated with X-rays and then mated with…

A: J. Muller first showed in his experiment that exposure to certain dose of X-rays higher than the…

Q: In a species of roses, the alleles RP and RR code for pink roses and red roses, respectively. In…

A: Paramutation represents a unique interaction between alleles where one allele induces a heritable…

Q: For the three genes shown, identify the row that indicates the alleles that would be found in each…

A: Sexual reproduction increases genetic variation in a population. Offspring obtained from sexual…

Q: In Drosophila, a cross was made between females and wild-type males. The female parents expressed…

A: In Drosophila , there are three types of trait :-  A ) Trait for wing  B ) Trait for body colour  C…

Q: You have already localized the genes to the same chromosome by deletion mapping, and now decide that…

A: A test cross is one that involves cross between an individual (with unknown genotype) with a…

Q: Two groups of geneticists, in California and in Chile, begin work to develop a linkage map of the…

A: Linkage is defined as either the gene's close association or other DNA sequences that are present on…

Q: The wild-type (normal) fruit fly, Drosophila melanogaster, has straight wings and long bristles.…

A: Drosophila melanogaster is a fruit fly, it has a short structure, and thus, they are easy to handle.…

Q: Below are the results from a 3 gene testcross between an XxYyZz plant and an xxyyzz plant: Testcross…

A: If the genes are located on the same chromosome then they are classified as linked genes. In this…

Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.