Why is the development of individuals with Klinefelter's and Turner's syndromes relatively normal, despite the fact that they have an abnormal number of X- chromosomes.
Q: Red–green color blindness is a human X-linked recessive disorder. A young man with a 47,XXY…
A: Color blindness is caused by a X-linked recessive allele. It is most prominant in males as males…
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A: The male sex-determining gene in human is termed as the sex determining region Y (SRY) gene.…
Q: Why is the gene for eye color in drosophila present on the X chromosome ?
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Q: Why do males and females express recessive X-linked alleles differently?
A: Genetics deals with the study of genes, genetic interactions, genetic variations and heredity in…
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A: Introduction Transmission of characters/genes from parents to offspring is referred as Inheritance.…
Q: Butterflies have an X-Y sex-determination system that is different from that of flies or humans.…
A: -The butterfly shown has a completely unique pattern of colors because o a special trait- it has two…
Q: Duchenne muscular dystrophy, which is inherited in an X-linked recessive pattern, nearly always…
A: Muscular dystrophy is a group of diseases that cause progressive weakness and loss of muscle mass.…
Q: Which sex chromosome (X or Y) carries the gene for eye color in Drosophila?
A: The mode of inheritance is a pattern of obtaining parentral alleles or genes to the offsprings. The…
Q: A purebred, red-eyed female fruit fly is mated with a white-eyed, male fruit fly. White eyes are…
A: All mammalian organisms exhibit sexual dimorphism. It means that there is the presence of a male and…
Q: Why is an X chromosome needed for survival?
A: The sex chromosomes or allosomes are X and Y chromosomes which determine the biological sex of an…
Q: Why is fragile X, but not Huntington disease, considered a syndrome?
A: Fragile X syndrome causes various symptoms including developmental delays, cognitive impairment, and…
Q: Can a woman who is affected by an X-linked dominant disorder have a child who is not affected? Why…
A: In physiology, X-linked dominant disorder is defined as genetic disorder occurs due to X chromosome…
Q: Why do X-linked recessive conditions appear most commonlyin males?
A: The genes are hereditary units of an organism. The appearance of the characteristics are a resultant…
Q: the deletion of which chromosome causes obvious morphological and mental defects in the organism,…
A: Cri-du-chat syndrome, otherwise called 5p-(5p minus) syndrome or cat cry syndrome, is a chromosomal…
Q: A family has an X-linked dominant form of congenital generalizedhypertrichosis (excessive…
A: Genes are the functional unit of DNA. It contains information that is transferred from one…
Q: Why are males affected by X-linked disorders much more oftenthan females?
A: Genes are the basic structural and functional unit of heredity. They carry coded genetic information…
Q: . Researchers discovered recently that the sole functionof the SRY protein is to activate an…
A: There are various genetic disorders that develop due to anomalies in sex chromosomes. They normally…
Q: For the following chromosome complements, what is the phenotypic sex of a person who has Q. XX with…
A: The sex-determining region Y (SRY) is located on the short branch of the Y chromosome, which…
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: What is a Barr body? How is its structure different from that ofother chromosomes in the cell? How…
A: Chromosomes are the carrier of genetic material deoxyribonucleic acid (DNA). They are coiled in…
Q: X-linked disorders (like hemophilia) are more likely to affect people of one gender than the other.…
A: Haemophilia is one of the X-linked recessive hereditary genetic diseases, which occur when the gene…
Q: A karyotype shows that a child has Klinefelter syndrome (47,XXY). If the child is also colorblind…
A: Karyotyping is the process of taking photographs of chromosomal pairs to determine the number of…
Q: What is the difference between X-linked dominant and X-linked recessive traits?
A: The sex chromosomes are present in pairs in the humans and several other organisms. These…
Q: Explain why a person with Klinefelter Syndrome (XXY) still exhibits abnormal phenotypes despite the…
A: The human sex is determined at the time of fertilization in the fallopian tube of the female…
Q: Why is it that so many of the sex-linked traits we talk about in humans are carried on X chromosomes…
A: Traits can be dominant, recessive, sex linked recessive or sex linked dominant. Dominance is the…
Q: Which sex chromosome (X or Y) carries the gene for eye color in Drosophila? Why?
A: Red eye colour is dominant over white eye colour in drosophila.
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: What is the phenotype of a person who has XXXY sex chromosomes? a. Klinefelter syndromeb. Turner…
A: Genetics is the branch of biology that deals with the study of genes, their variation, and heredity…
Q: Why does a single X chromosome cause infertility and other abnormalities in Turner Syndrome…
A: Turner syndrome (TS) is a genetic disorder that mostly affects females. The clinical features of…
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: Why are there so few Y-linked traits in humans?
A: The study of genetic variations, heredity, and genes is called genetics.
Q: Some individuals grow ear hair later in life, the gene for this trait is beleived to be carried on…
A: The phenotypic expression is the ultimate product of a gene. All of our phenotypic characteristics…
Q: Colorblindness is an X-linked trait found in humans. What are the chances that a colorblind man will…
A: Colorblindness is a recessive disorder located on the X chromosome. Since, it is recessive, two…
Q: What characteristics are exhibited by an X-linked trait?
A: X linked traits are defined as the traits that are located on the X chromosomes. Any mutation in…
Q: What do you think that means about the frequency of X-Linked Traits in people who arebiologically…
A: X-linked inheritance can be defined as a mode of inheritance in which a mutation in a gene on the X…
Q: Can males be a carrier of an X-linked recessive trait? How about females?
A: A characteristic that is sex-linked is one in which a gene is situated on a sex chromosome. In…
Q: What are X-linked traits?
A: Gene is a functional unit of heredity. A gene is a sequence of nucleotides in genome that codes for…
Q: Why do individuals with an excessive number of sex chromosomes often show minimum phenotypes?
A: Introduction :- The X and Y chromosomes are found in humans and most other mammals. Males have both…
Q: Why are the karyotypes with extra or missing X chromosomes, Turners syndrome, klinefelters syndrrome…
A: In many mammals, males and females have different sex chromosomes. Human female has two X chromosome…
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A: Understanding the basic law of inheritance is very important to understand the genetics of the…
Q: In fruit flies, Cinnabar eyes are encoded by a recessive allele located on the X chromosome. If a…
A: An allele may be defined as different forms of the same gene. The dominant allele is the one that…
Q: Why does the sex chromosome X carry the gene for eye color in Drosophila?
A: The mode of inheritance is a pattern of obtaining parentral alleles or genes to the offsprings. The…
Q: What are the possible genotypes and phenotypes (include probabilities) of offspring from a cross…
A: Wiskott–Aldrich syndrome (WAS) is an X-linked primary immunodeficiency condition marked by eczema,…
Q: Pedigrees indicate that color blindness and which two forms of hemophilia are X-linked traits?
A: Introduction Pedigree Analysis: this is the new approach to study the inheritance pattern in the…
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- A boy with Klinefelter syndrome (47,XXY) is born to a motherwho is phenotypically normal and a father who has the X-linkedskin condition called anhidrotic ectodermal dysplasia. The mother’sskin is completely normal with no signs of the skin abnormality.In contrast, her son has patches of normal skin and patchesof abnormal skin. Using the appropriate genetic terminology, explain theson’s skin phenotype.A boy with Klinefelter syndrome (47,XXY) is born to a motherwho is phenotypically normal and a father who has the X-linkedskin condition called anhidrotic ectodermal dysplasia. The mother’sskin is completely normal with no signs of the skin abnormality.In contrast, her son has patches of normal skin and patchesof abnormal skin. Question: Using the appropriate genetic terminology, describe themeiotic mistake that occurred. Be sure to indicate in whichdivision the mistake occurred.The karyotype of a young girl who is affected with familialDown syndrome revealed a total of 46 chromosomes. Her olderbrother, however, who is phenotypically unaffected, actually had45 chromosomes. Explain how this could happen. What wouldyou expect to be the numbers of chromosomes in the parents ofthese two children?
- Duchenne muscular dystrophy is a recessive disorder caused by a rare,loss-of-function allele that is located on the X chromosome in humans. Anunaffected woman (i.e., without disease symptoms) who is heterozygousfor the X-linked allele causing Duchenne muscular dystrophy has childrenwith a man with a functional (non-disease-causing) allele. What is theprobability that this couple will have an unaffected son?The maternal-effect mutation bicoid (bcd) is recessive. Inthe absence of the bicoid protein product, embryogenesis isnot completed. Consider a cross between a female heterozygousfor the bicoid mutation (bcd+/ bcd-) and a homozygousmale(bcd-/ bcd-). How is it possible for a male homozygous for the mutationto exist?Describe when X-chromosome inactivation occurs and how thisleads to phenotypic results at the organism level. In your answer,you should explain why XCI causes results such as variegated coatpatterns in mammals. Why do two different calico cats have theirpatches of orange and black fur in different places? Explainwhether or not a variegated coat pattern due to XCI could occur inmarsupials.
- A boy with Klinefelter syndrome (47,XXY) is born to a mother who is phenotypically normal and a father who has the X- linked skin condition called anhidrotic ectodermal dysplasia. The boy has patches of normal skin and patches of abnormal skin. Which of the following statemnets likely explains these observations? The father contributed the extra X chromosome in the son as a result of a non-disjunction in meiosis I during spermatogenesis. The mother contributed the extra X chromosome in the son as a result of a non-disjunction in meiosis II during oogenesis. The mother contributed the extra X chromosome in the son as a result of a non-disjunction in meiosis I during oogenesis. The father contributed the extra X chromosome in the son as a result of a non-disjunction in meiosis II during spermatogenesis. Either parent could have contributed to the extra X chromosome in the son as a results of disjunction in either meiosis I or meiosis II during…A family has an X-linked dominant form of congenital generalizedhypertrichosis (excessive hairiness). Although the allele is dominant,males are more severely affected than females. Moreover, the womenin the family often have asymmetrical, hairy patches on their bodies.How does X chromosome inactivation explain this observation?Why are X-linked recessive disorders never passedfrom a father to a son?
- Fragile-X syndrome causes the most common form of inherited intellectual disability. What is the chromosomal abnormality associated with this disorder? What is the phenotype of this disorder?Describe the chromosomal alterations and phenotype of cri du chat syndrome and Prader-Willi syndrome.The gene for the production of eye colour in this species of fruit fly can be expressed aseither normal red-eyes or as brown-eyes. The allele for the normal red eyes is dominant tothat of brown, and is transmitted in normal Mendelian fashion.A gene involved with body colour in this species of fruit fly is located on the non-homologousportion of the X chromosome, and has two alleles, grey and yellow, where the grey allele isdominant to yellow.The two genes are NOT linked.a) Produce a key to clearly show the nature of the alleles associated with the eye colour inthis species of Drosophila, and in each case justify your choice of letters and / or style ofpresentation to best depict the genetics involved.