Which of the following statement is false about X chromosome inactivation in mammals? O It only occurs in males O It relies on chromatin remodeling O It involves histone modifications It leads to the formation of Barr body
Q: Based on everything we have learned in this class we can confidently say that each sister chromatid…
A: Sister chromatids These are two similar copies of the same chromosome that are formed by DNA…
Q: In mammals, males have X and Y sex chromosomes, while females have two Xs. While the Y sex…
A: In an XY-chromosomal system of sex determination in mammals, both X and Y-chromosomes are sex…
Q: Barr bodies area. genetically active X chromosomes in males.b. genetically inactive X chromosomes in…
A: Darkly stained bodies which were observed in the G0 stage of nerve cells of female cats but not in…
Q: Occasionally, a mouse X chromosome is broken into two pieces and each piece becomes attached to a…
A: Introduction One Of Two Sex Chromosomes Is The X Chromosome. The X And Y Chromosomes Are Found In…
Q: only at the pseudoautosomal regions. Genes in the pseudoautosomal regions on the Barr body X…
A: INTRODUCTION Meiosis Meiosis is a reduction division and the daughter cell contain half the number…
Q: While examining a human female, you discover that she has 44 autosomes and two sex chromosomes, an X…
A: Chromosomes are DNA molecules that possess the genetic material in them. Chromosomes are present in…
Q: A diploid plant cell contains 2 billion base pairs of DNA. Q. Give the number of molecules of each…
A: Nucleosome is the packaging unit in eukaryotes. It is a fundamental subunit of chromatin.…
Q: long chromosome of somatic cells of somatic cells gene of germ cells of germ cells gene of either…
A: Mitosis and meiosis are the types of cell division. Mitosis occurs in all the cells of the body…
Q: A homologous chromosome is O Identical groups of chromosomes. O the exact same chromosomes from…
A: BASIC INFORMATION DNA It stands for deoxyribo nucleic acid. It is the genetic material of all…
Q: are forms of the same gene with small differences in their sequence of DNA. Alleles A O Histones .B…
A: Alleles are forms of the same gene with small difference in their sequence of DNA So, the correct…
Q: The somatic cells of a particular plant each contain a total of 40 chromosomes. How do the…
A: First option is correct.
Q: In Drosophila virilis, somatic cell nuclei contain 12 chromosomes while sperm nuclei contain only 6…
A: Chromosomal replication does not occur between meiosis l and meiosis ll ; Meiosis l proceeds…
Q: In mammals, the X and Y chromosomes contain different sets of genes. They are able to pair together…
A: Chromosome are long , thread like structure exhibited inside the nucleus of the cell that contain…
Q: 11. Tortoiseshell cats have different alleles for fur colors on their X chromosomes, with different…
A: X linked traits are those traits which are encoded by the genes present on the X chromosomes.
Q: Which of the following are associated with dynamic mutations? O Genomic imprinting O Trinucleotide…
A: First of all we will discuss that, what is dynamic mutation and its causes. Dynamic mutation is the…
Q: Homologous pairs refers to O the fact that the sex-determining genes are found on the first and…
A: Homologous pairs are pairs one from each parent, that are similar in length, gene position and…
Q: A female fruit fly has one normal X chromosome and one X chromosomewith a deletion. The deletion…
A: Deletion: Chromosome segment comprises 1 or more genes separates and is lost. It is further of two…
Q: Create a box-and-arrow model that describes: a. how information in the AMH gene results in the…
A: Humans have 23 pairs of chromosomes of which 22 pairs are autosomal and the 23rd pair is sex-linked.…
Q: When you see all those little colored "Xs" on a karyotype, each "X" is actually (Кеер in mi that we…
A: Mitosis is the type of cell division in which a cell divides into two cells and the chromsomes are…
Q: Xist encodes a protein that will coat a Y chromosome to promote its compaction. Xist is located in…
A: Xist is a gene product which is inactive and it helps in dosage compensation in females. Females…
Q: Why do females not produce more protein encoded by genes on the X chromosome than males? One X…
A: The Y chromosome is one-third the size of the X chromosome and contains about 55 genes while the X…
Q: The figure above shows a metaphase in which one chromosome is only connected to the spindle by a…
A: Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly…
Q: How can human females and males function normally, despite carrying different umbers of the X…
A: Each persons normally has one pair of sex chromosomes in each cell. Females express two X chrmosome…
Q: What is characteristic of a pair of homologous (maternal and paternal) chromosomes? O a. G banding…
A: Introduction:- Homologous chromosomes, also known as homologs, are made up of two chromosomes, one…
Q: A cytogeneticist is studying the cells from an abnormal female monkey. In some cells, she finds that…
A: reason for bar body formation The reason for this is that, in each somatic cell of a normal female,…
Q: Human somatic cells have Each pair: • 1 chromosome is from the 1 chromosome is from the chromosomes,…
A: Chromosomes are made up of DNA. DNA ultimately is responsible for the formation of a protein which…
Q: Variable expression of the MERRF syndrome arises from O recombination between nuclear and mtDNA O…
A: Myoclonic epilepsy with ragged red fibres (MERRF) is one of the mitochondrial disorders,…
Q: Vhich statement best explains why so many variations in coat colors exist? O Each coat color is the…
A: Recombination is a process where DNA segments are broken down from one chromosome and recombined…
Q: When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation…
A: In biology, Thomas Hunt Morgan (1866-1945) is a true legend. Before his prominent role in developing…
Q: On rare occasions, a chromosome can suffer a small deletionthat removes the centromere. When this…
A: Chromosomes convey the vast majority of the hereditary material and subsequently they: carry…
Q: Occasionally, a mouse X chromosome is broken into two pieces and each piece becomes attached to a…
A: The X chromosome is one of the two sex chromosomes in mammals, along with the Y chromosome. The X…
Q: A gene that is located on either sex chromosome | Choose Genes on the X chromosome are called |…
A: Gene is the sequence of nucleotide that and code a particular trait.
Q: Your friend sends you two cancerous cell lines to examine and detérmihe posi mutations. The results…
A: Mutations are alterations in the DNA sequence of an organism. Small changes, such as adding or…
Q: Following is the example of which structural chromosome abnormalities: salelile salelile slalk…
A: Question - Following is the example of which structural chro me abnormalities: Reciprocal…
Q: The plant Haplopappus gracilis has a 2n of 4. A diploid cellculture was established and, at…
A: Introduction A normal cell can divide by two processes one is Mitotic cell division while the…
Q: A human with an XY chromosome pair appears female. What might explain this person's condition? O…
A: ANSWER;-c) This person has a mutated SRY gene Explain;- Variations (additionally called changes)…
Q: A female will be mosaic for a particular gene if: O Females cannot be mosaic for a particular gene…
A: Female has two X chromosomes. Whereas male has one X and one Y chromosome.
Q: Thomas Hunt Morgan performed many genetic experiments using fruit flies. After crossing red-eyed…
A: Male flies have XY genotype while female flies have XX genotype.
Q: Barr bodies inactivate Xic on autosomes. O are formed in female somatic cells O are formed in female…
A: Barr bodies is an inactivated X-chromosome. It is present in a cell that contains more than one…
Q: Most times additions or deletions of sex chromosomes is usually not lethal O True O False
A: Deletion refers to the loss of chromosome. Where's addition refers to the extra chromosome.
Q: in a mammal, how many inactivated x chromosomes would be present in individuals of XO phenotype? A)…
A: The level of gene activity produced by a single X chromosome is the normal "dosage" for a human. Men…
Q: What is a major explanation for why the most common examples of aneuploidy in humans involve the sex…
A: Aneuploidy in humans involves sex chromosomes. Except nondisjunction Human genetic disorders can…
Q: Lid (Little imaginal discs) is a gene located on chromosome 2L and FRT40A refers to an FRT sequence…
A: Introduction A mutation is a change in an organism's DNA sequence. Mutations can occur as a result…
Q: he first gene to be mapped to a specific chromosome was the gene coding for white eye colour in…
A: Genes are made up of short stretches of DNA that code for a functional protein. Genes are inherited…
Q: Small chromosomal duplications provide raw material for the addition of genes into a species'…
A: Transposable elements are also known as jumping genes.
Q: The normal human skin cell has Select one: O a. 23 pairs of autosomes O b. 46 autosomes O c. 22…
A: Chromosomes are the condensed and coiled structures that occurs inside the nucleus of the cell of…
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- somatic cells males a normal amount of one too many sex chromosomes excess females infertility death the germ line autosomes one too few Humans who have aneuploidy of the sex chromosomes are viable. A human who has the Klinefelter syndrome (XXY) has the normal number of and will produce the normal amount of proteins from gene on autosomes. A person who has Klinefelter syndrome (XXY) has X chromosomes, one of which will condense into a Barr body in somatic cells. Most X chromosome genes produce protein. The few genes in the PAR region of the X chromosome remain active and those genes produce XXY somatic cells, leading to skeletal abnormalities in with Klinefelter syndrome. protein in the In the Barr body is reactivated. The higher dose of X chromosome gene expression in the XXY male germ line leads to defective spermatogenesis andDuring metaphase, what may happen if spindle fibers (kinetochore microtubules) will not be attached at the centromere via the kinetochore? the cell will be arrested at G zero phase the DNA will be fully distributed to all daughter cells O the number of DNA will be divided to two daughter cells One of the daughter cells may not contain any DNA at allWhich of the following is found in the chromosome centromere and regulates segregation? Cenp-A Kinesin7 Ndc80 Aurora B Kinase O Rho GEF < Previous
- You have a ONA FISH probe hat binds to a specific regi on in chromosome 2 and Ony displays one green spot. you perrorm a ONA FISH in'a ccll that is in GI and See faur Of the cell wouid be abnormal and descrbe the abnormality and what type itis. green spots instead Of one, wnat ave two dinferent ways mat chromosaneWhich of the following facilitate chromosome separation during anaphase of mitosis? All of these facilitate chromosome separation. kinesin 13 - directed kinetochore microtubule depolymerization kinetochore microtubule shrinkage at the plus end dynein-dynaction motor protein- directed forces ◄ Previous Next ▸ (6L) NI S'8 X NI S'S SHOIn an XXYY human: two X chromosomes are inactivated in every cell one X chromosome is inactivated in each somatic cell none of the X chromosomes are inactivated in each somatic cell two X chromosomes are inactivated in each somatic cell
- Equalizing the Expression of X Chromosome Genes in Males and Females Males have only one X chromosome and therefore only one copy of all genes on the X chromosome. Each gene is directly expressed, thus providing the basis of hemizygosity in males. Females have two X chromosomes, but one is always inactivated. Therefore, females, like males, have only one functional copy of all the genes on the X chromosome. Again, each gene must be directly expressed. Why, then, are females not considered hemizygous, and why are they not afflicted with sex-linked recessive diseases as often as males are?Almost all calico cats (one is pictured in FIGURE 10.7B) are female. Why? B When this calico cat was an embryo, one of the two X chromosomes was inactivated in each of her cells. The descendants of the cells formed her adult body, which is a mosaic for expression of X chromosome genes. Black fur arises in patches where genes on the X chromosome inherited from one parent are expressed; orange fur arises in patches where genes on the X chromosome inherited from the other parent are expressed. FIGURE 10.7 Animated X chromosome inactivation.Equalizing the Expression of X Chromosome Genes in Males and Females Individuals with an XXY genotype are sterile males. If one X is inactivated early in embryogenesis, the genotype of the individual effectively becomes XY. Why will this individual not develop as a normal male?
- Abnormalities in the number of X chromosomes tend to be milder than the same abnormalities in autosomes because of _______. a. deletions b. nonbomologous recombinat ion c. synapsis d. X inactivationA colleague e-mails you saying that she has identified an interesting chromosome variation at 21q13. In discussing this discovery with a friend who is not a cytogeneticist, explain how you would describe this location, defining each term in the chromosome address 21q13.females infertility the germ line less one too many a normal amount of autosomes one too few death males sex chromosomes somatic cells Humans who have aneuploidy of the sex chromosomes are viable. A human who has Turner syndrome (XO) has the normal number of autosomes and will produce the normal amount of proteins from gene on autosomes. A person who is XO has one too few X chromosomes. A Barr body will not form. Most X chromosome genes produce a normal amount of protein. The few genes in the PAR region of the X chromosome remain active on all copies of the X chromosome. In Turner syndrome, those genes produce somatic cells than normal, leading to skeletal abnormalities. with protein in In the Barr body is normally reactivated. In individuals with Turner syndrome, the lower dose of X chromosome gene expression in the female germ line leads to defective oogenesis and