Genetics assignment three - Essay Example

From the openingsubdivision of the questions, the following are the replies. a) The genotype of Dave is Ff b) The F1 males in the case where the F2 male offspring exhibit normal phenotype is ffc) Dave’s mother genotype is Ff.Quiz one a) Falseb) Falsec) Falsed) TrueQuiz twoa) The inheritance pattern subject to speculation by scientists toavert uniparental inheritance is Trisomy rescue.b) Non-disjunction in spermatogenesis results into the sperm cell getting two copies of chromosome 15 from the father.

When that sperm fertilizes the ovum, the consequential fetus has three chromosomes in place of the usual two. This phenomenon explains why a person may have two chromosomes originating from one parent.Question three a)Question three bThe translocation heterozygote is "ABCPQR" to "MNODEF."Question Foura) The number of chromosomes in allodiploid is 41.b) The number of chromosomes in allotetrapoid is 82.c) Among the allotetraploid and allodiploid, it is allodiploid that is sterile.Question fiveFrom a species having 2n=24, the number of chromosomes that will get found in all gametic cells produced in each of the following species variants would be;a) Hexaploid would be 72b) Autotetraploid would be 48c) Octosomic would be 15d) Nullosomic would be 12Question sixThe types of chromosome abnormalities that is essential for the alteration this chromosome to each of the following chromosomes are as stated. a) ABB•EDCFGThe insertion of the gene B between the gene sequence AB and the centromere plus an inversion of the gene sequence CDE to EDC.b) AB•VWXYZA translocation of the gene sequence CDEFG with the sequence VWXYZ from another chromosomec) AB•CDGThe deletion of the gene sequence EFd) C•BADEFGAn inversion of the gene sequence ABC to CBAQuestion Sevena) The imprinting pattern of inheritance is analogous to sex influenced inheritanceThe imprinting pattern of inheritance is analogous to sex influenced inheritance is true since some sex dissimilarities in appearance of inherited qualities may result from the genetic imprinting (Judd 21).

Genetic imprinting, therefore, refers to variant expression of chromosomes, parts of chromosomes, or individual genes, depending on any one of the two sexes from where they get inherited. For the achievement of imprinting, genetic materials can get modified during the process of gamete creation or near the beginning embryonic growth in any of the two sexes (Judd 33). Therefore, the imprinted genes determine the traits that are articulated in a different way than would be the expected case under distinctive Mendelian inheritance.b) Imprinting is a specific activation of the Y chromosome This assertion is false since imprinting is not specifically activation of the Y chromosome because with imprinted genes one can inherit only one working copy of the gene both from the mother or a father (Judd 46).

Therefore, depending on the gene, either the copy of the father or the mother, by addition of methyl groups at some stage during sperm or egg formation can epigenetically get silenced. c) Imprinted genes persist for more than one somatic cell divisioncycle in the offspring who receives the imprinted gene.Trued) Allelic (or gene) imprinting occurs through gametogenesis.TrueQuestion Eighta) karyotypicmosaicism most likely occurred in Meiosis.b) Turner mosaicism could have arisen through errors in early fetal cell division that resulted in some of the cells having two complete copies of the X chromosome whereas the other have only one copy.

The absent X chromosome results in developmental faults in the fetus.Question NineWorks CitedJudd, Sandra J. Congenital Disorders Sourcebook: Basic Consumer Health Information about Nonhereditary Birth Defects and Disorders Related to Prematurity, Gestational Injuries, Congenital Infections, and Birth Complications, including Heart Defects, Hydrocephalus, Spina. 2nd ed. Detroit, MI: Omnigraphics, 2007. Print.