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- Abnormalities in the number of X chromosomes tend to be milder than the same abnormalities in autosomes because of ________.a. deletionsb. nonhomologous recombinationc. synapsisd. X inactivationDuchenne muscular dystrophy (DMD) is caused bya recessive mutant allele of an X-linked gene calleddystrophin. Rarely, females have disease symptomsas severe as those in males hemizygous for therecessive allele. These females are heterozygous forX-autosome reciprocal translocations where the Xchromosome breakage occurred in the middle of thedystrophin gene, breaking it into two pieces.a. If it is equally likely for X chromosome inactivation to spread from either of the X chromosomeinactivation centers (XICs; see Fig. 12.15) in thecells of this patient, what proportion of her cellswould you expect to have normal function of thedystrophin gene?Over a period of two years, a man in his early 20s receiveda series of intermittent chemotherapy and radiotherapytreatments for Hodgkin disease. During this therapy, heand his wife were unable to initiate a pregnancy. The man had aseries of his semen samples examined at a fertility clinic. The findings revealed that shortly after each treatment very few mature sperm were present, and abnormal chromosome numbers were often observed in developing spermatocytes. However, such chromosome abnormalities disappeared about 40 days after treatment, and normal sperm reappeared about 74 days posttreatment. How might a genetic counselor explain the time-related differences in sperm production and the appearance and subsequent disappearance of chromosomal abnormalities?
- Match the chromosome disorder to its descriptionin the key. Jacobs syndrome a. female with undeveloped ovaries and uterus, unable to undergopuberty, normal intelligence, can live normally with hormonereplacementb. XXY male, can inherit more than two X chromosomesc. male or female, mentally impaired, short stature, flat face, stubbyfingers, large tongue, simian palm creased. XXX or XXXX femalee. caused by nondisjunction during spermatogenesisThe 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-). Predict the outcome (normal vs. failed embryogenesis) inthe F1 and F2 generations of the cross described.A woman who sought genetic counseling is found to be heterozygousfor a chromosomal rearrangement between the second andthird chromosomes. Her chromosomes, compared to those in anormal karyotype, are diagrammed on the next page:(a) What kind of chromosomal aberration is shown?
- Haploinsufficiency means the reduced dosage of a normal gene product is not enough for a normal phenotype TRUE OR FASLE ASAP I LL RATE NO EXPLANATION NEEDEDHuman sex-linked disorders in which male children are affected and female children are carriers are carried on the ________ chromosome. a. X b. 22nd c. YA tomato geneticist attempts to assign five recessivemutations to specific chromosomes by using trisomics.She crosses each homozygous mutant (2n) with each ofthree trisomics, in which chromosomes 1, 7, and 10 takepart. From these crosses, the geneticist selects trisomicprogeny (which are less vigorous) and backcrosses themto the appropriate homozygous recessive. The diploidprogeny from these crosses are examined. Her results, inwhich the ratios are wild type:mutant, are as follows:Which of the mutations can the geneticist assign towhich chromosomes? (Explain your answer fully.)
- In com, male sterility is controlled by maternal cytoplasmic elements. However, the presence ofa nuclear fertility restorer gene (F_) restores fertility to male sterile lines. Draw your simulated crosses male sterile female x FF male and give the genotypes and phenotypes of the offspring in each cross.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?Including the sex chromosomesthe chromosome number of a normal human cell is 23 and the chromosome number of this HeLa cell is