In the snail Cepaea nemoralis, an autosomal allele causing a banded shell (BB) is recessive to the allele for an unbanded shell (BO). Genes at a different locus determine the background color of the shell; here, yellow (CY) is recessive to brown (CBw). A banded, yellow snail is crossed with a homozygous brown, unbanded snail. The F1 are then crossed with banded, yellow snails (a testcross). Q.What will the results of the testcross be if the loci assort independently?

Q: Farmer Brown had two hogs, Olga and Hank.  Olga and Hank were normal, healthy hogs, but whenever…

A: Ogla and Hank must be both heterozygous for the condition. That is why they are producing some…

Q: Please consider the following pedigree. Assume that people who marry in to the family do not carry…

A: Pedigrees are interconnected diagrams to study and trace the particular trait over a few generations…

Q: Hemophilia is a X-linked/sex linked recessive trait in humans. The dominant allele (H) causes normal…

A: Himophilia is the disorder related to blood clotting. it is sex linked recessive disorder. So only…

Q: Using the pedigree chart below: Key Unaffected Affected Carrier Unknown 7 3 9 16 10 11 12 17 13 14…

A: Colour blindness can be described as a genetic disorder in which a person cannot differentiate…

Q: Brachydactyly type D is human autosomal dominant condition in which the thumbs are abnormally short…

A: Brachydactyly type D is a genetic abnormality, which occurs due to a dominant gene mutation 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: In unicorns, two autosomal loci interact to determine the type of tail. One locus controls whether a…

A: Introduction  Here, in the given question for one character allele “T” Tail is dominant over allele…

Q: ake the example of B-thalassemia, an autosomal recessive genetic disease that particularly affects…

A: A point mutation is a change in the single nucleotide pair of DNA.

Q: phenotype of a cat

A: Phenotype : A phenotype is an individual's observable traits.

Q: A fly that is heterozygous at 3 different, independent, autosomal loci (AaBbCc) is crossed to an…

A: The genotype is defined as the genetic constitution or composition of an individual. Thus, it is the…

Q: In Drosophila, an autosomal gene determines the shape of the hair, with B giving straight and b…

A: Drosophila melanogaster is also known as fruit flies

Q: The condition phenylketonuria is caused by a recessive allele. There are two carriers who have…

A: Phenylketonuria (PKU) It is an autosomal recessive condition that causes mental impairment owing to…

Q: In mice the autosomal genotype yy is for gray fur, YY is for brown fur and Yy is for yellow fur.…

A: DNA ( deoxyribonucleic acid) is the genetic material that the organism inherits from the parental…

Q: A recessive maternal effect mutant in zebrafish, called ichabod, results in embryos lacking heads…

A: Maternal effect in zebrafish is a situation where the phenotype of an organism is determined not…

Q: Shown below is a pedigree for Phenylketonuria (PKU), an autosomal recessive metabolic disorder. The…

A: Phenylketonuria (PKU) is an autosomal recessive disorder.  Autosomal recessive trait…

Q: A standard three-point mapping is conducted for recessive mutations in autosomal genes purple eye…

A: Chromosome mapping first introduce the great scientist T.H. Morgan. By the help of recombinant…

Q: In pedigrees, individuals are usually specified by using a Roman numeral for their generation in the…

A: Cystic fibrosis (CF) is an inherited disorder that causes severe damage to the lungs, digestive…

Q: Imagine that two unlinked autosomal genes with simple dominance code in goats for size, where L is…

A: The alleles are the alternative forms of a gene that are located on the same locus of a homologous…

Q: In dogs, dark coat color phenotype (D) is dominant over albino (a) and short hair (S) is dominant…

A: Given  Allele D is dominant over allele a  Allele S is dominant over allele l    D = dark coat…

Q: In cultivated flowers called “stocks,” the recessive genotype of one locus (aa) prevents the…

A: Given: In cultivated flowers called “stocks,” the recessive genotype of one locus (aa) prevents the…

Q: In mice, an allele for apricot eyes (a) is recessive to an allele for brown eyes (a+). At an…

A: Introduction: Mendel has given the law of independent assortment which says that during the transfer…

Q: . In mice, the following alleles were used in a cross: W = waltzing gait w = nonwaltzing gait G =…

A: The collection of genes that make up a person's genotype is referred to as that person's genotype.…

Q: cats, a sex-linked recessive allele, d, results in dystrophin-deficient muscular dystrophy. Its…

A: In this case mother would be heterozygous for polydactyly because she transfer f  allele to male…

Q: Consider a situation where you have a parental cross with the mother and father phenotypes listed…

A: Introduction:- Inheritance is the process of genetic information being passed down from parent to…

Q: In aliens, the genes A, B, C, D and E are dominant to their respective alleles a, b, c, d and e:…

A: A dominant allele is one that expresses itself in homozygous as well as heterozygous condition. A…

Q: Assuming a pure-breeding P generation, what ratio would you expect in the F2 generation if a mutant…

A: The alleles are the alternative forms of a gene that are located on the same locus of a homologous…

Q: This pedigree traces the inheritance of a rare disease in humans. a. Based on this pedigree, is the…

A: Answer is given below.

Q: Tightly curled hair is caused by a dominant autosomal gene in humans. This trait is rare among…

A: if they are homozygous dominant then CC. if they are heterozygous dominant then Cc. if they are with…

Q: . In corn, the allele A allows the deposition of anthocyanin (blue) pigment in the kernels (seeds),…

A: The genes that can be inherited together and lies close to one another on the same chromosome are…

Q: Using just the information on this pedigree, is Huntington’s disease caused by a dominant allele or…

A: As per the honor code, we answer only three sub-parts at a time. So, we are answering the first…

Q: Hair or fur length in cats is controlled by a single, autosomal gene; the short hair-allele is…

A: Genetics is the branch of science that deals with the study of gene and their inheritance from one…

Q: Along with the trait in the pedigree, individual IV-6 and the woman are also both heterozygous for…

A: A pedigree is a genetic representation of a family tree that shows how a trait or disease is passed…

Q: The pedigree shows inheritance of the autosomal recessive trait cystic fibrosis in a family. Family…

A: Diploid organisms carry two sets of chromosomes and thus, carry two copies of almost every gene.…

Q: Consider a cross between a Brown furred dog and a Yellow furred dog. All the puppies born from these…

A: Ans- True Autosomal Recessive Inheritance As in the case of an autosomal recessive trait, it is…

Q: In corn, the allele A allows the deposition of anthocyanin (blue) pigment in the kernels (seeds),…

A: Introduction :- Chromosomes are the greatest level of DNA and protein organisation. Chromosomes'…

Q: A certain type of congenital deafness in humans is caused by a rare autosomal (not X-linked)…

A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…

Q: Consider the following three autosomal recessive mutations in Drosophila: vestigial wings (v); wild…

A: Three point test cross is given in the question. The F2 progenies is used to find the middle gene.

Q: In the California poppy, an allele for yellow flowers (C) is dominant over an allele for white…

A: According to the question, in California poppy, yellow flower allele(C) is dominant over white…

Q: In dogs, dark coat color phenotype (D) is dominant over albino (a) and short hair (S) is dominant…

A: Given  D is dominant over a  D gives dark coat colour and a gives albino colour.    S is dominant…

Q: This is an ungraded question about gene order that I found confusing. If this question possibly…

A: According to the given condition, locus of the recessive alleles (A, B, C, D, and E) is deleted by…

Q: Using the letter "G" to represent the dominant-acting allele and the letter "g" for the recessive,…

A: The pedigree analysis is referred to as the study of an inherited trait in a family. It helps in…

Q: In a certain animal, black coat (B) are dominant to white coat (b). In a genetic cross of two…

A: Introduction :- Even if an individual only has one copy of a dominant allele (also known as being…

Q: In mice, the wild-type coat color, agouti (AA) [left mouse], is dominant to solid-colored, black fur…

A: Some phenotypes are controlled by more than one genes and this is known as polygenic inheritance. In…

Q: Which of the following is NOT a reason that a testcross is a useful technique when studying the…

A: Test cross is the best experiment done by the father of genetics (Gregor Mendel) on the garden pea…

Q: In yeast, the alleles for colony colour and tryptophan dependence are located on different…

A: When genes are close together on the same chromosome, they are said to be linked. Morgan discovered…

Q: In human beings, the gene for red‑green colorblindness (r) is sex‑linked and recessive to its allele…

A: Given that colorblindness is a recessive X-linked trait. Hence in females, both X chromosomes should…

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…

Q: In the fruit fly Drosophila melanogaster, the following genes and mutations are known:Wing size:…

A: Gene: Genes are genetic material that passes from parents to progeny. The dominant allele can…

Q: Duchenne muscular dystrophy is an inheritable disorder that results in muscle weakness, leading to…

A: Duchenne muscular dystrophy This is an X-linked recessive disease. This genetic disorder is…

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.