Xg is an antigen found on red blood cells. This antigen is caused by an Xlinked allele (Xa) that is dominant over an allele for the absence of the antigen (X–). The inheritance of these X-linked alleles was studied in children with chromosome abnormalities to determine where nondisjunction of the sex chromosomes took place. For each type of mating in parts a through d, indicate whether nondisjunction took placein the mother or in the father and, if possible, whether it took place in meiosis I or meiosis II (assume no crossing over). Q. XaY × XaX- → X- X- Y (Klinefelter syndrome)

Q: The picture below represents a G1 cell from a newly discovered species that uses the X/Y sex…

A: The cell is in G1 phase and hence it undergoes the S phase to duplicate the DNA. Thus, homologous…

Q: Let’s say there is an organism with two pairs of alleles, W/w and Z/z, each pair is located on a…

A: Cell is the basic structural and functional unit of life. Group of cells is known as tissue.

Q: Hemophilia results from a sex-linked gene. The disease is most common in males, but the hemophilia…

A:

Q: Let’s say there is an organism with two pairs of alleles, W/w and Z/z, each pair is located on a…

A: Mitosis is a type of cell division that occurs in all the cells except sex cells. Here the…

Q: Harbour seals are an aquatic mammal found in many oceans. In seals the gene E is X-linked and F,G,…

A: Mammals have XY sex determination system. Aquatic mammals would also have the same sex determination…

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: What would be the genotype(s) of F2 offspring that carry recombinant chromosomes? (Note: recombinant…

A:

Q: A gene involved with body colour in this species of fruit fly is located on the non-homologous…

A: The Gene for Eye Color in Drosophila: Red vs. BrownIntroductionThis species of fruit fly possesses a…

Q: Table 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a…

A: Chromosomal deletion syndrome occurs when whole or part of chromosomes are missing. Turner Syndrome…

Q: Draw a Punnett square for the dihybrid cross. There are two known alleles of gene occupying a…

A: Dihybrid cross involves two genes in a cross. That's why the two traits are involved in this cross.

Q: The orange coat color allele in cats is located on the X chromosome and is one of two genes…

A: The two variants of coat color found in cats are orange and black. The alleles responsible for these…

Q: Describe the outcomes of the three types of matings (F+ x F- , Hfr x F- , and F' x F- ).

A: The F+, F-,hfr, and F' cells are involved in conjugation that is a gene transfer method in bacteria.…

Q: Both hemophilia (h) and favism (gd) are inherited as X-linked recessive traits. Hemophilia is an…

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

Q: The genes for the eye-color of fruit flies are located in their X chromosome, or X – linked. (R…

A: According to the question, we have to answer the following questions -  The genes for the eye color…

Q: An attached-X female fly, XX ¬Y (see the “Insights and Solutions” box), expresses the recessive…

A: Inheritance or heredity is passing-on one trait from the parents to the progeny by either asexual or…

Q: If a normal male reproduces with a heterozygous normal female, what are the expected genotypes and…

A: Hemophilia is a common hereditary coagulation blood disorder due to deficiency or reduced activity…

Q: Please answer question (a) (b) and (e)

A: Crossing over increases variations.

Q: Tightly curled hair is caused by a dominant autosomal gene in humans. If a heterozygous curly-haired…

A: The major traits of Autosomal inheritance is : trait should not skip generations as well as the…

Q: Assume that color blindness is a recessive character on the X chromosome. A man and woman with…

A: Introduction  Inheritance referred to the transmission of character/traits in the form of gene from…

Q: Draw a Punnett square for the dihybrid cross described below (it is the same story as given for…

A: X linked characters are those where the the gene in question is located on the X chromosome. Females…

Q: You have spent two decades studying a muscular dystrophy disorder. All previous pedigree data…

A: X linked disease is a type of sex linked disease in which the mutation is present in X chromosome.…

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: In alley cats, the coat color is determined by a gene carried on the X-chromosome. At the same time,…

A: The objective of the question is to determine the probable paternity of a litter of kittens based on…

Q: “carrier

A: X-linked inheritance means that the gene causing the trait or the disorder is located on the X…

Q: Determine what is the most likely mode of inheritance of this disease (whether it is inherited as…

A: Inheritance pattern is a pattern tat evaluates how traits are transmitted from parent generation to…

Q: Hemophilia in humans is due to an X-chromosome mutation. What will be the result of mating a…

A: Introduction  Hemophilia is a genetic disorder that affects the blood's ability to clot normally.…

Q: A man with blood type O (genotype ii) has a father with blood type A and a mother with blood type B.…

A: In human blood group typing, the ABO system of blood grouping is used.  The Blood groups are A, B,…

Q: The picture below represents a G1 cell from a newly discovered species that uses the X/Y sex…

A: Meiosis results in the formation of four haploid cells from one diploid cell.

Q: Duchenne muscular dystrophy (DMD) is caused bya recessive mutant allele of an X-linked gene…

A: Duchenne muscular dystrophy (DMD) is a progressive form of muscular dystrophy that results in muscle…

Q: The image shows a pair of homologous chromosomes from a single parent before gamete production. M1…

A: Genetic linkage is a study which shows us the  genes or alleles which are close to each other on a…

Q: When Bridges crossed white-eyed females with red-eyed males, he obtained a few red-eyed males and…

A: Genetics is the study of inheritance of genes among the generations that deals with heredity and…

Q: Let’s say there is an organism with two pairs of alleles, W/w and Z/z, each pair is located on a…

A: Cell division is a phenomenon takes place inside the cell during which parent cell undergo…

Q: Assume that color blindness is a recessive character on the X chromosome. A man and woman with…

A: Colorblindness is a sex linked disease in which the X chromosome is affected. In this type of…

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.