Part A) You cross a fly with straight wings with a fly with curved wings to produce the F1 generation, all of which exhibit straight wings. In the F2 generation, you observe 65 straight-winged flies and 16 curved-wing flies. Based upon the results, which phenotype is recessive? Part B) You think this trait is controlled by a single gene, but the F2 numbers don’t quite match a 3:1 expected ratio. Perform a chi-square analysis to determine if the variation you observe is due to chance or not. Based upon this determination, would you keep or reject the “null hypothesis”? Show your work and explain your reasoning.

Q: A wild-type fruit fly (heterozygous for gray body color and wings) mated with a black fruit fly with…

A: Need to find the recombination frequency between the two genes.

Q: Grey eyes (b) are recessive to brown eyes (B). Two brown-eyed people had a grey-eyed child. Which…

A: A genetic trait is considered dominant if it is expressed in a person even in its single copy. While…

Q: A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations…

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

Q: What is the difference between a monohybrid cross and a dihybrid cross?    A.  A monohybrid cross…

A: Sir Gregor Mendel was a priest and a teacher who did the famous hybridization experiment on garden…

Q: Hemophilia and color blindness are both recessive conditions caused by genes on the X chromosome. To…

A: Recombination frequency is defined as the proportion of recombinant offspring produced in a genetic…

Q: In a test cross, an individual dominant for a certain trait ( whether homozygous or heterozygous is…

A: Test cross- It is tool to determine  whether the individual organism is homozygous or heterozygous .…

Q: 20.Which among the following statements is INCORRECT?

A: Mendel the scientist worked on the inheritance pattern of different plants and animals and proposed…

Q: Red-green color blindness is caused by a recessive allele on the X chromosome.  A color blind woman…

A: The mutant gene for colour blindness produces an X-linked recessive trait/ disorder. In sex-linked…

Q: A. Part 1: F1 Generation Yellow Sampaguita- Homozygous recessive (cc) White Sampaguita- Homozygous…

A: Introduction: Dominant allele is able to express itself even in the presence of its recessive…

Q: The pedigree below shows a family of whom several members exhibit a genetic disorder. All the shaded…

A: Pedigree is the diagrammatic representation of family members for a particular trait.

Q: According to Figure 3, what is the probability that the individual #12 in generation III will show…

A: The trait is autosomal recessive in the pedigree.  Recessive: There are found skipping of trait…

Q: A cross between fruit files with genotypes Aa Bb × aa bb produces the following progeny: 10 Aa Bb…

A: Linkage is a phenomenon in which how genes are placed in close proximity to each other but in the…

Q: cular country in sub-Saharan Africa, a medical study revealed that 0.075% of the country's…

A: Given; The study done in sub Saharan country.0.075% of the country's population are suffering from…

Q: Let’s suppose a genetic disease is caused by a mutantallele. If two affected parents produce an…

A: Genetic disease is defined as an inherited medical condition or state caused by an abnormality in…

Q: Silky feathers in fancy breeds of chickens are caused by a gene whose effect is recessive to that…

A: Genes are the functional units of heredity. It carries information from one generation to another.…

Q: Fruit flies are very useful model organisms that have been used to study genetics. One mutant…

A: An eyeless fruit fly is represented by ey gene which is a recessive gene. Homozygous normal fly is…

Q: In a testcross of a corn plant heterozygous for 3 linked, recessive genes (a, b, & d), the following…

A: Alfred H. Sturtevant was the first to discover gene mapping. In order to determine the relative…

Q: Bateson and Punnett crossed two white-flowered lines and saw all purple flowers in the F1…

A: A pair of genes can often work together to create a specific genotype it is called complementary…

Q: We know that the most common form of color blindness results from an X linked recessive gene. A…

A: Colour blindness is an X linked recessive disorder.

Q: You are doing a genetics experiment with the fruit fly. In the "F1" generation, you cross two…

A: According to Bartleby guidelines, the first three subparts have been answered kindly post the…

Q: Why is there no trait (letter) on the y chromosome for males in this pedigree? A. Because the trait…

A: The genetic inheritance pattern is one of these kinds viz. autosomal recessive, autosomal dominant,…

Q: that follows Mendelian rules of inheritance, what is the only way an organism can have the recessive…

A: Mendel explained his results by describing two laws of inheritance that introduced the idea of…

Q: In the human pedigree shown below, black filled symbols indicate individuals suffering from a rare…

A: The pedigree is a family tree diagram that depicts the inheritance pattern in a family. The female…

Q: What was the hypothesis of the X-linked cross conducted in the lab (between white-eyed female and…

A: White eye color in drosophila is an x linked recessive mutation that causes phenotype change. These…

Q: The recessive allele s causes Drosophila to have small wings, and the s+ allele causes normal wings.…

A: It can be represented as,

Q: A rare recessive mutation causes rabbits that are normally white to be pink. If one in a hundred…

A: Given: A rare recessive mutation causes rabbits that are normally white to be pink .  White -…

Q: How can we solve for a X-linked trait gene problem? . If a heterozygous parent (AB/ab) is…

A: In living organisms, the differences in the specific traits are due to the presence of two versions…

Q: The pedigree below shows three generations of a family that carries albinism, an autosomal recessive…

A: Pedigree chart: It is a chart that shows the family genetic history. It is used to determine the…

Q: Red eyes are dominant on fruit flies but an x-linked recessive allele will produce white eyed flies.…

A: Eye colour of Drosophila is X linked traits . This means genes for Eye colour trait is available on…

Q: If a male bird that is heterozygous for a recessive Z-linked mutation is crossed to a wild type…

A: In case of birds the males are homozygous for the sex chromosome and the genotype is ZZ. The females…

Q: You are looking at the color of feathers in ducks and find that yellow ducks (Y) are dominant to…

A: When expression of a gene is dependent on the absence or presence of another gene, such condition is…

Q: A certain polled bull was bred to three cows. With cow A, which is polled, a horned calf was…

A: A monohybrid cross is cross in which only single trait is involved .  As per the question , Trait is…

Q: In a particular country in sub-Saharan Africa, a medical study revealed that 0.075% of the country's…

A: Hardy Weinberg equilibrium states that the relative frequencies of various kinds of genes in a large…

Q: You find a person that has a new allele that is not found in DNA samples taken from skin cells of…

A: The sperm is produced from the father but the process of meiosis. The egg is produced from the…

Q: You cross a fly with straight wings with a fly with curved wings to produce the F1 generation, all…

A: In genetics, dominance refers to the phenomenon of one gene variant (allele) on one copy of a…

Q: A sex-linked recessive allele rg causes a red-green colorblindness in humans. A normal woman whose…

A: Mostly the sex-linked diseases are X-linked ( unless stated otherwise). These alleles are found only…

Q: The attached image is a pedigree of a family with a history of sickle cell anemia (the individuals…

A: Sickle cell anemia is a genetic condition caused by a mutation in the gene that codes for…

Q: The R gene is a sex-linked gene that causes curly hair in guinea pigs. Wild-type guinea pigs have…

A: The figure shows the pedigree chart in which curly hair female mates the straight hair male. Later…

Q: In humans, having extra fingers or toes is caused by a dominant allele (E). People with two…

A: (According to our guidelines, we are required to answer only the first three subparts in case of…

Q: Hemophilia and color blindness are both recessive conditions caused by genes on the X chromosome .…

A: Sex liked diseases are genetic disease that occur due to abnormality in the sex chromosomes. Color…

Q: a. What type of chromosomal abnormality does she have? b. Why doesn’t she have any symptoms? c.…

A: Chromosomal abnormality leads to the disorders and irregularity in DNA causing extra  addition or…

Q: A researcher mutagenized a group of butterflies and isolated six butterflies with extra-long bodies.…

A: Mutation is a change in a DNA sequence. Mutations can result from DNA copying mistakes made during…

Q: In an attempt to breed winter barley that is resistant to barley mosaic virus, agricultural…

A: When the cross is made between a susceptible plant and a resistant plant, all the progeny will be a…

Q: Does the pedigree below appear to show a dominant trait or a recessive trait? What patterns did you…

A: Pedigree chart represents the genetics and genomics of the individuals. It shows the transmission of…

Q: If the allele for brown hair is represented as “B” , it would mean that. A- the gene for brown hair…

A: The dominant trait for the hair color is influenced by the dominant allele which is 'B". The blonde…

Q: According to Figure 3, what is the probability that individual #17 in generation III will show the…

A: The trait is autosomal recessive in nature. Because of following reason: The trait skips from one…

Q: In humans, the gene for albinism (a) is recessive to the gene for normal skin pigmentation (A).…

A: An allele is a variant form a gene and is present in two forms: dominant and recessive. The dominant…

Q: In the pedigree attached, the shaded symbols represent people affected with a neurological disorder…

A: The pedigree is the family history of a particular disease that involves several signs and symbols…

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.