The term epistasis is used to refer to a situation in which the expression of a gene is influenced by another independently inherited gene. In labs, the gene B determines how much pigment is made.  The dominant allele B results in black fur and the recessive allele b results in brown (chocolate) fur. A separate gene, E, codes for a protein that determines whether the pigment is deposited in the hair. (E = pigment deposited; e = pigment not deposited).      What genotypes are possible for a black lab?         What genotypes are possible for a chocolate lab?        What genotypes are possible for a yellow Lab?       In a cross between a black lab that is homozygous for both alleles and a yellow lab that is homozygous for both alleles, what would the genotype and phenotype of the offspring be?       Imagine you cross two heterozygous parents.  What are the genotypic and phenotypic ratios of the offspring?

Q: If a rabbit with the defective gene is not fed plants with the pigment, what color is its fat? Can…

A: As provided with the information that rabbit with active form produce white-colored fat and those…

Q: a. In which sex, XY males or XX females, would the Sxl protein bind to the msl-2 mRNA? b. As…

A: Drosophila sex determination and dosage compensation are primarily controlled by two distinct sets…

Q: nheritance of one mutant allele of BRCA1 is associated with 70-80% lifetime risk of developing…

A: BRCA1 is a tumor suppressor gene inactivation leads to breast cancer.

Q: Which of the following statements does NOT describe an environmental influence on the expression of…

A: An organism's phenotype is a function of its genotype, and it also has an effect on the environment.…

Q: Mutation that results in death before the age of reproduction Mutation that results in an inactive…

A: Dominant mutations are those mutations which arise from the mutation of single copy of  dominant…

Q: Gene dosage is important for a number of genetic phenomenon. Name two and explain their relationship…

A: The gene dosage is a concept in which the synthesis and concentration of the primary gene product is…

Q: mice, the A allele causes agouti fur, the AY allele causes yellow fur and is dominant to the A…

A: The gene in question is thought to be important, and the deadly allele can be dominant or recessive.…

Q: You are evaluating a trait that is associated with fur color in mice. The trait is controlled by a…

A: Here  the genotype of the mother is A1A1 and the genotype of the father is A2A2  By Crossing we get…

Q: Recessive alleles may be expressed in a child if they are inherited ... (Choose all that apply)…

A: X-linked Recessive diseases are those genetic diseases that are caused by the mutation of genes on…

Q: In a woman who is a carrier of a mutant OTC deficiency allele, her sons who receive the mutant…

A: An alteration in the ornithine transcarbamylase (OTC) gene results in the genetic disorder known as…

Q: Define ‘gene’. What is an allele and loss-of-function alleles? What do these alleles tell us about…

A: "a DNA phase that contributes to the phenotype/characteristic of an organism."

Q: In mice, coat color is due to the inheritance of three genes located on three different chromosomes.…

A: The genotype forms a genetic makeup of a cell, and therefore also determines the phenotype of any…

Q: There are two genetic disorders that result from mutation in imprinted genes: Prader-Willi syndrome…

A: The correct answer is option f. Only III-1 could havе Pradеr-Willi syndromе.

Q: The pedigree below shows the inheritance pattern of a rare X-linked allele for one family. The…

A: Pedigree is a family chart where genetic councillor put some symbol for easy description of a…

Q: Two parents are healthy carriers of the mutations that cause sickle-cell disease and cystic…

A: Mutations in the gene that codes for the "cystic fibrosis transmembrane conductance regulator (CFTR)…

Q: A person’s blood type is the result of expression of a gene with three alleles. However, only 2…

A: The blood group is determined by the presence of specific antigen on the plasma membrane of red…

Q: A recessive mutation pd causes purple eyes in Drosophila, in contrast to the wildtype red eyes. A…

A: The objective of this question is to determine the proportion of offspring that will have purple…

Q: Cats are hairless when homozygous recessive (hh) for the Hairless gene. Cats have straight hair when…

A: Epistasis: It is the phenomenon in which one gene or allele masks the function of another gene or…

Q: evidence suggests that spherocytosis is incompletely penetrant?

A: Spherocytosis is a condition that affects red blood cells. People suffering from spherocytosis…

Q: hich of the following best explains how individuals who inherit phenylketonuria alleles can avoid…

A: Phenylketoneuria is a rare genetic condition in which a person is unable to dogest the amino acid…

Q: A RFLP is discovered that is linked to the gene for Duchenne’s muscular dystrophy (DMD). DMD is an…

A: RFLP (Restriction Fragment length polymorphism) : RFLP (Restriction Fragment length polymorphism is…

Q: In mice, the A allele causes agouti fur, the AY allele causes yellow fur and is dominant to the A…

A: Mutations are alterations in the DNA sequence of an organism. Small changes, such as adding or…

Q: In the species Polyfarius obscescens, one gene controls lipid storage. Individuals with the dominant…

A: Storage lipids, also known as triacylglycerols, membrane lipids, which include glycerophospholipids…

Q: When the expression of alleles are affected by the presence of other genes,such as sickle cell trait…

A: If a person is a carrier of sickle cell anemia then half of the RBC of the individual are…

Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.