How many Barr bodies are present in the interphase cells of the ff. individuals? A) Klinefelters where 2n = 48 (assume no autosomal aneuploidy in this individual) (b) metafemales with chromosome number of 48 (no autosomal aneuploidy in this individual). Show solutions.
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- Rice has a chromosome number of 2n = 24. If different aneuploids are available in rice, identifythe specific aneuploidy that shows the following chromosomal configurations at diakinesis ormetaphase I. Also provide the formula and chromosome number of the different aneuploids. Complete the table. Chromosome configuration at diakinesis or metaphase I Specific Type of Aneuploidy Formula (e.g. 2n+1) Chromosome number (2n=24) Types of gametes n, n+1, n+2, n-1, n-2) a. 1 III + 11 II b. 1 IV + 11 II c. 1 I + 11 II d. 11 II e. 2 I + 10 IIFor the following chromosome complements, what is the phenotypic sex of a person who has Q. XX with a copy of the SRY gene on an autosomal chromosome?A specific human individual with a male sex has the same sex chromosome complement as a metafemale Drosophila fly. Both individuals have a diploid set of autosomes.i) What is the sex chromosome complement of these two individuals? ii) If these individuals were produced from a fertilization event involving an abnormal egg and abnormal sperm cell, provide the genetic make-up of the two gametes? Clearly indicate the male and female gametes.
- Assume that the diploid number of a certain species is four chromosomes, two large and two small (2n=4). a) Of the following figures, which represents a 3n (triploid) cell in mitotic metaphase? b) For each of the wrong answers from part (a) above, explain briefly why it cannot represent a triploid cell in mitotic metaphase.A female patient 19 years old, whose symptoms areanemia and internal bleeding due to a massive buildupof leukemic white blood cells, is diagnosed withchronic myelogenous leukemia (CML). Karyotypeanalysis shows that the leukemic cells of this patientare heterozygous for a reciprocal translocation involving chromosomes 9 and 22. However, none of thenormal, nonleukemic cells of this patient contain thetranslocation. Which of the following statements istrue and which is false?a. The translocation results in the inactivation (loss offunction) of a tumor-suppressor gene.b. The translocation results in the inactivation (loss offunction) of an oncogene.c. There is a 50% chance that any child of this patientwill have CML.d. This patient is a somatic mosaic in terms of thekaryotype.e. DNA extracted from leukemic cells of this patient,if taken up by normal mouse tissue culture cells,could potentially transform the mouse cells intocells capable of causing tumors.f. The normal function of the…Familial retinoblastoma, a rare autosomal dominant defect, arose in a large family that had no prior history of the disease. Consider the following pedigree (the darkly colored symbols represent affected individuals): a. Circle the individual(s) in which the mutation most likely occurred. b. Is the person who is the source of the mutation affected by retinoblastoma? Justify your answer. c. Assuming that the mutant allele is fully penetrant, what is the chance that an affected individual will have an affected child?
- Identify the type of chromosomal aberration described in each of the following cases: a. loss of a chromosome segment b. extra copies of a chromosome segment c. reversal in the order of a chromosome segment d. movement of a chromosome segment to another, nonhomologous chromosomeRice has a chromosome number of 2n = 24. If different euploids and anaeuploids are available in rice, identifythe chromosomal mutation, chromosome configuration, chromosome number, and/or type of gametes in each of the mutations below. Complete the table. Example: for 10B, the answer is "10 II + 2 I"A male Drosophila from a wild-type stock is discovered to have only 7 chromosomes, whereas normally 2n = 8. Close examination reveals that one member of chromosome IV (the smallest chromosome) is attached to (translocated to) the distal end of chromosome II and is missing its centromere, thus accounting for the reduction in chromosome number. (a) Diagram all members of chromosomes II and IV in the male fly during synapsis in meiosis I. b) If this male mates with a female with normal chromosomes composition, what chromosomes compositions will occur in their progeny? Describe the type of chromosomal aberration that may occur in their progeny and indicate chromosome number for each progeny produced.
- B. A woman is a carrier of a Robertsonian translocation between chromosomes 18 and 21. (i) Her chromosome set with respect to chromosomes 18 and 21 would consist of which specific chromosomes. Please draw a DIAGRAM illustrating these chromosomes as they would appear in their unreplicated state, clearly labeling the chromosomes and the chromosome arms present. (ii) If this woman were to have a child with a man who possess a completely normal set of chromosomes, there are six different possible outcomes with respect to the combinations of chromosomes 18, 21, and Robertsonian translocation chromosome that could be present in their offspring. Please indicate the TYPES and NUMBERS of chromosomes of each type present in their potential offspring. You may label the chromosomes as follows: 18 (for chromosome 18), 21 (for chromosome 21) or 18/21 (for the Robertsonian translocation chromosome). Also, please indicate the specific genetic abnormality (if any) that would be present in…A. Please explain the key differences between each of the following pairs of terms. (i) Haploid vs. monoploid (ii) Pericentric inversion vs. paracentric inversion (Please include a simple diagram, along with your written explanation.) (iii) Homologous chromosomes vs. homeologous chromosomes:what is the significance of chromosomal aberration? what are the different types of chromosomal abberations based on the structure and number of chromosomes? give examples for each. what environmental factors may increase in the incidence of chromosomal aberrations?
