Haemophilia is a genetic disorder caused by a recessive allele on the X chromosome. A haemophilia female marries a normal male. Explain why all their sons will be haemophilia.

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: cance of color blindness in humans is due to a recessive gene located on the X chromosome X linked).…

A: Mother     ×      father            XXc                  XcY Progeny -      X Xc Xc XXc…

Q: A man with red-green color blindness marries a woman who is not color blind. They have 3 children,…

A: Color blindness is basically a genetic disorder which can be inherited from parents.These patients…

Q: The manifestation of symptoms of a recessive disorder requires the loss of function of both copies…

A: Genes play a crucial role in determining an individual's traits and susceptibility to genetic…

Q: If the proband (III-2) marries a heterozygous woman, what is the probability that they will have a…

A: Autosomal dominant inheritance is a type of inheritance where the presence of a single dominant…

Q: A cross was performed between a female curly winged fly and a normal (straight) winged male fly.…

A: As per the question, a cross was performed between a female curly winged fly and a male straight…

Q: Hemophilia is a disease caused by a gene found on the X chromosome. Therefore, it is a sex-linked…

A: If the woman  gets the X chromosome with the hemophilia gene, she will have hemophilia . A man who…

Q: Amelogenesis imperfecta (AI) is a disorder of faulty tooth enamel formation. It is inherited in an…

A: The trait shown is inherited both autosomal dominant and X-linked; the presence of the dominant gene…

Q: Cystic fibrosis is an autosomal recessive disorder caused by a defective gene that causes a thick…

A: The genotypic representation for cystic fibrosis can be done as below: CC = Normal, Cc =…

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

A:

Q: For a recessive X-linked mutation, such as colorblindness, explain the pattern of inheritance from…

A: Recessive X-linked mutation can be defined as the type of mutation which occurs in the X chromosome…

Q: Cystic fibrosis is a genetic disorder that results in the build-up of thick mucus in the lungs and…

A: Cystic fibrosis is a genetic disease caused by abnormalities in the CFTR gene. As a result, an…

Q: The allele for baldness is on the X chromosome only. Can any sons obtain theallele for baldness from…

A: A critical baldness gene is found on the X chromosomes. This suggests that the probability of…

Q: Wilson’s disease is an inherited disorder in which there is too much copper in the body’s tissue. It…

A: A pedigree chart is a graphic that depicts the incidence and emergence of phenotypes of a certain…

Q: A female has a family history of Duchenne muscular dystrophy, a recessive sex- linked condition that…

A: Since, the disorder is sex linked recessive, we have,  Genotype of affected female - XDXD Genotype…

Q: Duchenne muscular dystrophy (DMD), marked by muscular degeneration, results from an X- linked…

A: Duchenne muscular dystrophy is a X- linked inherited disease which is characterized by degeneration…

Q: Achondroplasia, which is characterized by difficulty converting cartilage to bone and thus results…

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

Q: Cystic fibrosis is a disease that is passed down through the generations. The recessive alleles for…

A: Genes carry the traits from one generation to another. Genes that code for different forms of a…

Q: Why can a person carrying a translocation be normal except for theinability to have children?

A: Translocation is a hereditary change were a piece of one chromosome servers and connects to another…

Q: The genetic disease hemophilia A is a sex-linked trait. Jane has an uncle on her father's side of…

A: Hemophilia is a bleeding condition caused by a hereditary inability for the blood to clot…

Q: Sex linkage refers to genes which are linked to each other on the sex (X or Z) chromosomes.

A: The chromosomes that are present in the diploid cells of the sexually reproducing animals are…

Q: In humans, hemophilia is a sex-linked recessive disease, and the gene is located on the X…

A: Hemophilia is a sex-linked recessive disease. This means that in order to produce a diseased…

Q: Duchenne muscular dystrophy (DMD) is an example of an X-linked trait. This is a neuromuscular…

A: Duchenne muscular dystrophy (DMD) is an example of an X-linked trait. This is a neuromuscular…

Q: Wilma and Wally have one male child who has been diagnosed withDuchenne muscular dystrophy, an…

A: Duchenne muscular dystrophy is a medical condition of muscular dystrophy which is caused by DMD gene…

Q: The pedigree shows inheritance of an autosomal recessive disease in an extended family. Assume…

A: Although the trait is skipped in the pedigree, autosomal recessive inheritance is discovered. The…

Q: Mutations of the CFTR gene causes ( Cerebral Plasy or Cystic Fibrosis or Craniofacial timbrosis or…

A: Mutations of the CFTR (Cystic Fibrosis Transmembrane Conductance Regulator) gene primarily cause…

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: Huntington’s disease is an autosomal dominant disease in humans, but the first symptoms usually…

A: Autosomal dominant disorder inheritance The dominant autosomal mutated gene cause the defect in…

Q: Charles has achondroplasia dwarfism (autosomal dominant) but his wife is normal. What is the…

A:

Q: Amy Alvarez had a recessive X-linked chromosome for a disorder such as, hemophilia, and said that…

A: Amy Alvarez is wrong , she need to more information.

Q: Explain why trisomy X is not a lethal condition.

A: A female who has an additional X chromosome at birth is said to have triple X syndrome.  It might be…

Q: Amy Alvarez had a recessive X-linked chromosome for a disorder such as, hemophilia, and said that…

A: Amy Alvarez has a recessive X linked chromosome disorder.  She is having hemophilia.

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: Hemophilia is determined by genes on the X chromosome in humans. Assume that a phenotypically normal…

A: Hemophilia is an X-linked recessive condition defined by the inability to clot normally due to a…

Q: A man with blood type O marries a woman with blood type AB. What is the probability that their third…

A: Punnett squares are square diagrams made out of a grid of generally four boxes that are used to…

Q: Haemophilia is an X-linked recessive disorder. If a woman is a carrier for haemophil. and has a…

A: Hemophilia is basically an inherited bleeding disorder in which the blood doesn't clot properly,…

Q: Write the name of the term that describes the phrase. Non-identical chromosomes that determine male…

A: The non-homologous chromosome is referred to as a type of chromosome present in the nucleus that are…

Q: Piebaldism is a skin condition that causes an infant to be born with white birthmarks due to a…

A: It is an autosomal dominant genetic disorder. It is mainly due to the absence of melanocytes of the…

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.