Anhidrotic ectodermal dysplasia is an X-linked recessive disorder in humans characterized by small teeth, no sweat glands, and sparse body hair. This trait is usually seen in men, but women who are heterozygous carriers of the trait often have irregular patches of skin with few or no sweat glands (see the illustration below). Q. Why does the distribution of the patches of skin lacking sweat glands differ among the females depicted in the illustration, even between the identical twins?

Q: One of the X chromosomes in a particular Drosophila female had a normal order of genes but carried…

A: Crossing over: It occurs during prophase I and involves the exchange of genetic material between…

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: In Drosophila melanogaster, white eyes (w) is an X-linked recessive mutation. Normal eyes are red…

A: The normal eyes are red in Drosophila melanogaster. Normal red eyes are represented by W. Whereas,…

Q: Suppose that a female with the mutation (i.e., a heterozygous female) mates with a healthy male (the…

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

Q: Hair length of the fur in cats can be either short or long. The allele for short hair is dominant to…

A: Genetics is the scientific study of genes and heredity, or how certain characteristics are passed…

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

A: Alleles are the alternative forms of a gene. Allele can be dominant or recessive.

Q: In humans color vision is X-linked, the gene for color vision is located on the X chromosome but is…

A: Colour blindness is a X linked Recessive disorder in which presence  of gene n on X chromosome is…

Q: In humans, one of the genes determining color vision islocated on the X chromosome. The dominant…

A: Sex-linked disorders generally have genes associated with the X chromosome. It is studied under the…

Q: Anhidrotic dysplasia (lack of sweat glands) is caused by loss-of-function of an X-linked gene. It is…

A: The female can be mosaic in nature. Because of presence of two X chromosomes. The one X chromosomes…

Q: Figure 5.1 presented abbreviated pedigrees looking at the inheritance of X-linked human conditions.…

A: Double heterozygote = Individual 1 in generation II, if the mother in generation I is homozygous…

Q: It is assumed that in Drosophila the following genotypes produce phenotypes. َA- B- = Red color A-…

A: Genetics may be a discipline of biology concerned with the study of genes, genetic diversity, and…

Q: Explain why genetic disorders caused by recessive alleles of X-linked genes appear more frequently…

A: In humans and other mammals, biological sex is determined by a pair of sex chromosomes: XY in males…

Q: The autosomal (not X-linked) gene for brachydactyly, short fingers, is dominant to normal finger…

A: Given: The autosomal (not X-linked) gene for brachydactyly, short fingers, is dominant to normal…

Q: In humans, color vision depends on genes encoding three pigments. The R (red pigment) and G (green…

A: The inheritance of color vision in humans depends upon three main genes that code for three…

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: Color blindness in humans is controlled by an X-linked completely recessive allele (Xc), while…

A: Introduction :- Color blindness (colour vision deficit) is a condition in which a person's ability…

Q: How many Barr bodies in a person with genotype XXXXX? How is the structure of a Barr body different…

A: The mammalian males contain XY chromosome and females contain XX chromosome. So, the number of…

Q: State the type of relationship shown between the black allele and the ginger allele for the gene…

A: Answer:  Genetics is the study of genes and heredity, or how specific characteristics or traits are…

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

A: Given: Miniature wings Xm - recessive Long wings X+ - dominant Male parent - long wings Female…

Q: Congenital pulmonary alveolar proteinosis is a rare lung disease in humans. The disease is caused by…

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

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: One of the X chromosomes in a particular Drosophila female had a normal order of genes but carried…

A: To determine : a. Why are there no male offspring with the allele combinations y v f+, v+ v+ f, y v+…

Q: The introduction to this chapter described the search for genes that determine pattern baldness in…

A: For the alleles to be inherited in a Mendelian pattern they must follow the laws of inheritance…

Q: Duchenne muscular dystrophy is a recessive disorder caused by a rare,loss-of-function allele that is…

A: Duchenne muscular dystrophy (DMD) is a quickly progressive type of muscular dystrophy that happens…

Q: In Drosophila melanogaster, white eyes (w) is an X-linked recessive mutation. Normal eyes are red…

A: Inheritance is defined as the passing of genetic inheritance from parental to next generation.

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: Considering an X-linked dominant trait, if an affected woman and an unaffected man decide to have…

A: X- linked dominant inheritance . In X linked dominant trait one dominant allele of the trait can…

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

A: The allele for miniature wings is represented with w And the allele for long wings with + The allele…

Q: The pedigree below shows the inheritance of red-green colorblindness, an X-linked recessive trait…

A: X chromosome of son is always comes from the mother. Only Y chromosome comes from the father . Any…

Q: Refer to the pedigree shown in Question 1. What are some examples of parent-child trios that allow…

A: The mode of inheritance is a pattern of obtaining parentral alleles  or genes to the offsprings. The…

Q: For the purpose of the assignment, we will refer to XY individuals as male and XX individuals as…

A: Genetics is the branch of biology that deals with the study of genes, their variation, and heredity…

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

A: The medical condition Anhidrotic ectodermal dysplasia is caused due to mutation precisely in the…

Q: In humans, the genes for red-green color blindness (R=normal, r=color-blind) and hemophilia A…

A: Both color blindness and hemophilia are X-linked traits which means they are inherited from…

Q: Drosophila, yellow body color is due to an X-linked gene that is recessive to the gene for gray body…

A: We are authorized to answer three subparts at a time, since you have not mentioned which part you…

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: In domesticated cats, the following are Independently assorting: Normal ears (T) is dominant to…

A: Genetics is the field of biology that deals with the flow of genes (the hereditary factor) in life…

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: Consider three autosomal genes (A, B and D) present in a hypothetical species. The a allele results…

A:

Q: In Drosophila, the X-linked recessive mutation vermilion (v) causes bright red eyes, in contrast to…

A: Genetic traits are regulated by genes.

Q: In humans, ABO blood types refer to glycoproteins in the membranes of red blood cells. There are…

A: There are 4 different blood groups present in the organisms. These blood groups are: A, B, AB and O.…

Q: Miniature wings in Drosophila melanogaster are due to an X-linked gene (Xm) that is recessive to an…

A: It is given that alleles for the trait for miniature wings (Xm) in Drosophila melanogaster are…

Q: What does homogametic mean in this context?   Produce a key to clearly show the nature of the…

A: Homogametic : It is used to define an organism or individual producing all gametes of the same type…

Q: Red-green colorblindness caused by an X-linked recessive allele in humans. • A woman who had a…

A: The mode of inheritance is a pattern of obtaining parentral alleles  or genes to the offsprings. The…

Q: Marfan syndrome is an autosomal dominant disorder caused by mutations in the FBN1 gene. It affects…

A: Understanding the basic law of inheritance is very important to understand the genetics of the…

Q: Drosophila melanogaster body color is controlled by one gene while wing shape is controlled by a…

A: Mendel's law of independent assortment states that the alleles of two  different genes get sorted…

Q: Vermilion eye color in Drosophila is sex-linked and recessive. What would be the phenotypes of male…

A: Vermilion eye color in Drosophila is a sex-linked and recessive characteristic.  This sex-linked…

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…