Which of the following statements is FALSE? Inactivation of one of the two X chromosomes in the somatic cells of mammalian females..... a. underlies the Calico phenotype in cats. b. leads to cellular mosaicism in females heterozygous for an X-linked gene. c. affects 75 % of the paternal and 25 % of the maternal X-chromosomes of a mammalian body. d. leads to the formation of a Barr body in female cells' nuclei. e. is the mechanism in mammals to compensate for the higher dosage of X-linked genes in females as compared to males.

Q: In Drosophila, a heterozygous female for the X-linkedrecessive traits a, b, and c was crossed to a…

A: Genetics is a branch of biology that deals with genes, heredity, and variation. Heredity purely…

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: What sex ratio would you expect among the offspring of a cross between a normal mape mouse and a…

A: Sex ratio is defined as the ratio of males and females in the population. Generally in sexually…

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: For an X-linked recessive disease where the father is unaffected: a) An affected father cannot pass…

A: When it is an X linked recessive pattern of inheritance, disease can only be manifested when it is…

Q: Calico is a coat color found in cats, which is caused by a X-linked, co-dominant allele Female cats:…

A: Co-dominance is condition in which two alleles of the gene are equally dominant, hence are termed as…

Q: In the snail Limnaea peregra, coiling of the shell is determined by the genes D for right-handed…

A: An embryo is formed when male and female gametes unite. In majority of organisms, female gamete is…

Q: In fruit flies, dosage compensation is achieved bya. X-chromosome inactivation.b. doubling the…

A: Dosage compensation refers to the mechanism of equalizing or balancing the expression of genes. It…

Q: In humans, hemophilia is an X-linked recessive gene and will only be expressed in females if  they…

A: Hemophilia is a X linked recessive disorder so which is inherited in homozygous condition. In rare…

Q: How does X inactivation contribute to a person’s phenotype? a. It controls the number and kind of…

A: X chromosome denotes one of the two sex chromosomes, another is the Y chromosome. Females are…

Q: Why do tortoiseshell coats occur primarily in female cats? O Testosterone suppresses the…

A: Tortoiseshell is a cat coat color that is named for the tortoiseshell material it resembles.…

Q: Which of the following is not a characteristic of X-linked recessive traits in humans?   a.…

A: X linked recessive is a condition caused due to recessive mutant genes located in X chromosomes. In…

Q: X inactivation explains the large color patches in calico cat fur and the smaller patches in…

A: The calico and tortoiseshell cats are named for their cat coloring.  The cat genes are usually…

Q: Which is NOT a way that deletions can cause abnormal phenotypes?

A: Haploinsufficiency  situation arrives due to total level of gene product/ a particular protein…

Q: A human individual is phenotypically female, but her interphase somatic nuclei show the presence of…

A: There would be three X-chromosomes in the karyotype of the female as only single X-chromosome is…

Q: Using breeding techniques, Andrei Dyban and V. S. Baranov (Cytogenetics of Mammalian Embryonic…

A: Trisomy is the condition of the presence of three copies of one or more chromosomes in the genome.…

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: According to the Lyon hypothesis,a. one of the X chromosomes is converted to a Barr body insomatic…

A: Lyon hypothesis, proposed by Mary Lyon states that the random inactivation of the X chromosome in…

Q: Red eyes are dominant on fruit flies but an x-linked recessive allele will produce white eyed flies.…

A: Eye colour of Drosophila is X linked traits . This means genes for Eye colour trait is available on…

Q: You are looking at the color of feathers in ducks and find that yellow ducks (Y) are dominant to…

A: When expression of a gene is dependent on the absence or presence of another gene, such condition is…

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: In humans, the development of gonadal sex in females is determined by a. The production of inductors…

A: Gonadotropin-releasing hormone (GnRH) stimulates FSH and LH generation in both males and females.…

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: An insect species is discovered in which the heterogametic sex isunknown. An X-linked recessive…

A: Chromosomal determination of sex is also known as allosomic determination of sex and is based on…

Q: humans, failure to synthesize melanin leads to a condition called albinism. This is a recessive…

A: Albinism is an autosomal recessive  disease and it occurs when both the alleles are not working…

Q: Describe when X-chromosome inactivation occurs and how thisleads to phenotypic results at the…

A: Chromosomes are the carrier of genetic material deoxyribonucleic acid (DNA). They are coiled in…

Q: Which of the following statements about calico cats is true? Select all that apply. Da Black fur…

A: The Correct option is A.

Q: EXAMPLE Ah nas a rare X-linked dominant condition called amelogenesis Imperfecta, whicn results in…

A: Amelogenesis imperfecta is due to the malfunction of the proteins in the enamel as a result of…

Q: Individuals with XYY chromosomes are said to be "supermale". Which of the following is FALSE…

A: Humans are said to have 23 pairs of chromosomes which makes a total of 46 when the cells are normal.…

Q: Which is a FALSE statement about X inactivation in mammalian females? O Females that are…

A: X-chromosome inactivation is the transcriptional silencing of one X chromosome in female mammalian…

Q: Researchers discovered recently that the sole functionof the SRY protein is to activate an autosomal…

A: Sex-determining region of Y (SRY) is responsible for maleness in males. Mutation in the SRY region…

Q: Which findings support the fact that the presence of the Y- chromosome rather than the lack of a…

A: In many animals including humans, sex is determined by sex chromosomes, which are X and Y…

Q: Cat breeders are aware that kittens expressing the X-linked calico coat pattern and tortoiseshell…

A: Gene is the unit of heredity that is transferable from the parent to the offsprings. The function of…

Q: A new gene is being investigated in fruit flies. The recessive allele of this gene (b) causes the…

A: Each chromosomes has hundreds of thousands of genes. Linked genes are those alleles lies together on…

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: Predict the probability (using a Punnett square) of producing an offspring affected by a single gene…

A: Inheritance is the process of transmitting the traits from parent to offspring. Traits of an…

Q: i) What are reciprocal crosses?  ii) Provide an example of the reciprocal crosses this scientist…

A: X - linked trait  The trait which are transferred in association with x- chromosomes are known as…

Q: 1. During the Human Genome Project, scientists learned that most of the human genome A. doesn't code…

A: According to our guideline we can answer only the first question. Upload the other questions…

Q: Molecular geneticists have performed experiments in which they altered the number of copies of the…

A: Drosophila melanogaster is a fly species that belong to order Diptera. Drosophila is also known as…

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: XX individuals can be sex-reversed males if one of their X chromosomes contains a translocated…

A: In a normal female, there are two X chromosomes and their karyotype is (46, XX). However, in some…

Q: In humans, the AR gene is located on the X chromosome. If a person who is XY has a complete deletion…

A: Androgen is a steroid hormone secreted in males that bind with the androgen receptors located on…

Q: In 1916, Dorothy Osborn suggested that pattern baldness is a sex-influenced trait that is dominant…

A: Pattern baldness is a sex-influenced trait that is dominant in males and recessive in females. The…

Q: If a Drosophila female that is homozygous for an X-linked recessive mutation is bred with a male…

A: An organism has phenotype and genotype. Phenotype is the observable characteristics and genotype is…

Q: Can the Lyon hypothesis be tested in a human female who is homozygousfor one allele of the X-linked…

A: Lyon hypothesis: The concept that a gene dosage imbalance between males and females is compensated…

Q: Which of the following statements is TRUE? Overexpression of the X-chromosome in the somatic cells…

A: Females posses two X chromosome and male possess one X chromosome.  The Y chromosomes is specific…

Q: 1A. What is the molecular basis for genomic imprinting? B. How is the process of X-chromosome…

A: Genomic imprinting is an inheritance process independent of the classical mendelian inheritance. It…

Q: In fruit flies, cye color is carried on the X chromosome. The allele for red eyes is dominant over…

A: Since the eye color is carried on the X chromosome, it is a sex-linked trait. The genotypes of the…

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.