Bicoid is a maternal-effect gene in the fruit fly Drosophila. Recessive mutations in bicoid can result in fly larvae that have no head, and thus are embryonic lethal. Which of the following crosses will result in offspring with the embryonic lethal, no head phenotype? (+ indicates a wild-type allele) a) bcd /bcd (male) x bcd+/ bcd (female) O b) bcd/ bcd (male) x bcd+/ bcd+ (female) O c) bcd+/ bcd+ (male) x bcd/ bcd (female) O d) bcd+/ bcd (male) x bcd+/bcd (female)

Q: Let’s suppose that two different X-linked genes exist in mice,designated with the letters N and L.…

A: The distance between the two genes N and L  can be surveyed by making crosses and by examining the…

Q: Coat color in mice is influenced by two genes, one for color (A) and one for the amount of pigment…

A: Answer

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

A: The condition where two identical genes are present in an individual for a particular character, is…

Q: You have a Drosophila line that is homozygous for autosomal recessive alleles a, b, and c, linked…

A: The Recombinant Frequency tells us about the percentage of or the proportion of recombinants present…

Q: In humans, the genetic disease cystic fibrosis is caused by a recessive allele (a). The normal…

A: Cystic fibrosis is only caused when both of the mutant alleles for cystic fibrosis are present. AA…

Q: In a species of bird, feather colour is determined by a single, non-autosomal gene that shows…

A: Given  Feather colour is non autosomal means it is sex based charecter. Parent phenotype  Female -…

Q: For an X-linked recessive allele, what proportion of female offspring will be carriers in the cross…

A: X - linked recessive allele -  This type of allele is caused due to genetic mutation in the gene. In…

Q: In barley, a self-fertilizing species that can be cross-fertilized, two true-breeding strains with…

A: Cytoplasmic inheritance:Inheritance of genes those present in the organelles of the cytoplasm to the…

Q: Cinnabar eye color is a sex-linked, recessive characteristic in fruit flies. If a female having…

A: Cinnabar eye is an X-linked recessive characteristic in fruit flies.   In general, X-linked…

Q: . What is the probability of producing a child that willphenotypically resemble either one of the…

A: The phenotype is the physical expression of the trait. It is an observable characteristic of an…

Q: In mice, short hair is dominant over long hair. If a heterozygous shorthaired male is crossed with a…

A: A gene is the basic structural and functional unit of heredity and is made of DNA(deoxyribonucleic…

Q: In flies, small wings are recessive to normal wings. If a cross between two flies produces 8…

A: The alleles are generally of dominant and recessive type and some other forms like codominant are…

Q: Imagine that you set up a three-point mapping cross to determine the order of three X-linked genes.…

A: This is the case of three point test cross. The crossing occurs between the heterozygous parent for…

Q: Write the genotype(s) of the flies in each generation. Use a low dash (e.g. A_ B_) to indicate…

A: Given  Both have fruitflies are taken from different strains.  Strain A = bright red eye  Strain B =…

Q: In humans, brown eyes (B) are dominant over blue. A brown eyed man marries a blue-eyed (b) woman and…

A: The phenotype of an individual is determined by his or her genotype. The genotype is determined by…

Q: The wingless fruit fly phenotype (unable to grow wings) is recessive to normal wing growth. A…

A: The wingless male fruit fly is crossed with a wingless female fruit fly and the progeny produced by…

Q: Red-green color blindness is inherited as an X-linked recessive (Xc).  If a color-blind man marries…

A: Heterozygous means an individual having two different alleles of a gene. (In this case, the woman is…

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: On average, what proportion of X-linked genes in the first individual are the same (inherited from a…

A: The X-Y system of determination of sex is observed in mammals. The sex-liked inheritance contains…

Q: What would be the genotypic and phenotypic outcome if each parent was self-fertilized?

A: Genotype is refer to a gene or set of genes that leads to a single trait. Phenotype is refers to the…

Q: eye color is determined by a recessive allele, v, of an X-linked gene. The wildtype color is…

A: Eye color in Drosophila is an example of a X-linked trait: In Drosophila, the gene for eye color is…

Q: Imagine that you set up a three-point mapping cross to determine the order of three X-linked genes.…

A: This is the case of three point test cross. The crossing over occurs between the heterozygous…

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: Holstein cattle suffer from the condition citrullinemia, in which homozygous recessive calves die…

A: Citrullinemia is the condition where ammonia and other toxic substsances acumulates in the body. It…

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: In flies, assume black (B) is dominant and green (b) is recessive for abdomen color, and straight…

A: A genetic map displays the map distance (in cM) between any two loci as well as the position of…

Q: What is the approximate percentage chance that individual V.2, shown in the pedigree diagrams above…

A: A recessive attribute is one that may be detected within the relationship between 2 variants of a…

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: brown eyes (B) are dominant over blue. A brown eyed man marries a blue-eyed (b) woman and they have…

A: The organisms with two same alleles at a genetic locus is called as a homozygote. The organism with…

Q: A) Calculate the map distance separating the three genes B) Which gene is in the middle?

A: Symbol  white eyes = r short wings = l  ebony bodies = g    red eyes = R long wings = L  Gray bodies…

Q: In fruit flies (Drosophila melanogaster), the bn+ allele for normal dull red eyes is dominant to the…

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

Q: In snails, the maternal gene influences the phenotype of the direction of snail coiling. If D is an…

A: dd female cross with dd male..

Q: In humans, the mic2 gene (involved in antibody production) is found on sex chromosomes and has…

A: The pseudoautosomal inheritance is observed for the allele in the identical regions of X and Y…

Q: A wild-type male and a wild-type female Drosophila with red eyes and full wings are crossed. Their…

A: Genetics, the study of heredity generally and of genes particularly. genetics forms one in every one…

Q: Which of the following statements is false?

A: Aneuploidy is the addition or deletion of one or more chromosomes.  Trisomy is the addition of one…

Q: Anhidrotic ectodermal dysplasia is an X-linked recessive disorder in humans characterized by small…

A: Anhidrotic ectodermal dysplasia (AED) is a type of immune deficiency observed in the human body. The…

Q: In Drosophila, an X-linked recessive mutation, (s) causes irregular wing margins. Give the…

A: Drosophila melanogaster is a fruit fly having 2n = 8 chromosomes. The male has a sex pair of…

Q: A cross occurs between a black homozygous mouse and a white homozygous mouse. They produce gray…

A: Incomplete dominance is a deviation from Mendel's law of Dominance. In this case, neither of the…

Q: Two different strains of Drosophila melanogaster are mated in reciprocal crosses. When strain A…

A: Transposable elements are DNA sequences that are able to change their position in a genome sequence.…

Q: If a man and a woman, both with normal vision, marry and have a colorblind son, draw the Punnet…

A: Colorblindness and hemophilia are X-linked recessive disorders. They are transmitted from female…

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

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

Q: In a cross between Aa Bb XCDXCD and Aa Bb XCDY, the A gene controls earwax- where wet earwax is…

A: A= earwax  B- tasting ability C- color vision D= dystrophin enzyme

Q: In the snail Limnaea peregra, coiling of the shell is determined by the genes D for right-hand…

A: The gene for the right-hand coiled shell is dominant given by D. The gene for the left-hand coiled…

Q: Which of the following inheritance patterns was observed, for the T2 bacteriophages of Escherichia…

A: Alfred Hershey and Martha Chase conducted an experiment to prove DNA is a genetic material.  They…

Q: In roses, two pathways combine to produce orange colored flowers in wild type. Two heterozygous…

A: The genes control the hereditary characters of an organism. The genes may be transferred via…

Q: For an X-linked recessive disease, if an affected male is crossed with an unaffected female who is…

A: "Genetics" is the study of the functioning and main codes of variation and heredity. Inheritance is…

Q: barley, a self-fertilizing species that can be cross-fertilized, two true-breeding strains with…

A: Reciprocal cross is done where different parental types are used both as a maternal form and as a…

Q: In Drosophila, gray body color is dominant to ebony body color, while long wings are dominant to…

A: Genotype is defined as the complete set of genes present in the individual and the information of…

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: For an X-linked recessive allele, what proportion of female offspring will be carriers in the cross…

A: The X-linked recessive disease is caused by the presence of one X-linked recessive allele. It is an…

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.