If a person has Down Syndrome (Trisomy 21), then the gamete produced by the mother of...
If a person has Down Syndrome (Trisomy 21), then the gamete produced by the mother of that person had:
A. 21 copies of chromosome 3.
B. three copies of chromosome 21.
C. 24 chromosomes.
D. 47 chromosomes.
Homework Answers
Answer: ‘C’ 24 chromosomes
Explanation: The person with Down’s syndrome will have three copies of chromosome number 21. For this condition to arise, when the embryo of this person is formed from the zygote, the zygote should have one chromosome extra that is 47 numbers of chromosomes and this happens when one of the gamates (mother or father) has 24 numbers of chromosomes instead of 23 because of non-disjunction. One chromosome is extra along with chromosome number 21.
If such a gamate gets fertilised with the normal gamate of chromosome number 23, then the resultant zygote will have 47 numbers of chromosomes instead of 46 and this forms an abnormal individual with Down’s syndrome. This is autosomal trisomy.
In this case the mother must be having 24 chromosomes with extra copy of chromosome number 21.
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If a person has Down Syndrome (Trisomy 21), then the gamete
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Down syndrome, or trisomy 21, in humans is caused by an extra copy of the relatively small, acrocentric 21. Including only chromosome 21, the X chromosome (medium in size and somewhat metacentric) and the Y chromosome (small and acrocentric), draw one possible array of chromosomes in the four sperm cells produced by the complete meiosis of one primary spermatocyte in a male individual with Down syndrome. For the purposes of this question, assume that males with Down syndrome produce normal...
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19) Trisomy 21, or Down syndrome, occurs when there is a nom complement but one (extra)...
19) Trisomy 21, or Down syndrome, occurs when there is a nom complement but one (extra) chromosome 21. Although fertility is reduced in both sexes, females have higher fertility rates than males. Van Dyke et al. (1995; Down Syndrome Research and Practice 3(2):65-69) summarize data involving children born of Down syndrome individuals. Assume that children are born to a female with Down syndrome and a normal 46-chromosome male. What proportion of the offspring would be expected to have Down syndrome?...
You are presented with a patient, named Gerry, who has Down syndrome (trisomy 21). You determine...
You are presented with a patient, named Gerry, who has Down syndrome (trisomy 21). You determine the nondisjunction event occurred in his mother, named Mary, during meiosis I. The TPTE gene is on chromosome 21. Mary has two different alleles of the TPTE gene (ex. T and t). Do Gerry's maternally-inherited chromosome 21s have the same or different alleles of the TPTE gene? Do not worry about recombination in this question. Same alleles Different alleles Not enough information to determine...
That individuals with Down Syndrome (caused by a triplet of genes at chromosome 21, Trisomy 4. It...
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5. Consider the following three conditions: Trisomy 21, or Down syndrome, is a condition where an...
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1. Down syndrome is due to a. nondisjunction of chromosome 21. O b. nondisjunction of the...
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19. A couple's only child has Down Syndrome. An examination of the child's karyotype reveals that...
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Please show calculation steps for this. Thank you Familial down syndrome is due to a Robesonian...
Please show calculation steps for this. Thank you
Familial down syndrome is due to a Robesonian translocation that fuses chromosome 21 to chromosome 14 (most often). Individuals that have this translocated chromosome but no symptoms of Down syndrome are called translocation carriers. How many chromosomes do translocation carriers have (human diploid cells are typically 2N=46)? If an individual has a Down syndrome caused by the presence of this type of Robesonian translocation, how many chromosomes do they have?
2. (5 PTS) You are presented with a patient, named Gerry, who has Down syndrome (trisomy 21). You determine that the nondisjunction event occurred in his mother, named Mary, during meiosis I. a. You are interested in the TPTE gene, which is near the centromere of chromosome 21. Virtually no recombination occurs between the centromere and the TPTE gene. Mary has two different alleles of the TPTE gene. Would Gerry's two chromosome 21s from his mother have the same or...
19) Trisomy 21, or Down syndrome, occurs when there is a nom complement but one (extra) chromosome 21. Although fertility is reduced in both sexes, females have higher fertility rates than males. Van Dyke et al. (1995; Down Syndrome Research and Practice 3(2):65-69) summarize data involving children born of Down syndrome individuals. Assume that children are born to a female with Down syndrome and a normal 46-chromosome male. What proportion of the offspring would be expected to have Down syndrome?...
You are presented with a patient, named Gerry, who has Down syndrome (trisomy 21). You determine the nondisjunction event occurred in his mother, named Mary, during meiosis I. The TPTE gene is on chromosome 21. Mary has two different alleles of the TPTE gene (ex. T and t). Do Gerry's maternally-inherited chromosome 21s have the same or different alleles of the TPTE gene? Do not worry about recombination in this question. Same alleles Different alleles Not enough information to determine...
that individuals with Down Syndrome (caused by a triplet of genes at chromosome 21, Trisomy 4. It is seen 21) have a shortened life span. Some of this may be due to cardiovascular defects present in about 80% of individuals. A more modern theory is that the cell cycle of individuals with this condition is cycling faster than individuals without the condition. As such, Down Syndrome patients may have an accelerated epigenetic clock. Describe at least three biochemical/genetic/epigenetic factors that...
5. Consider the following three conditions: Trisomy 21, or Down syndrome, is a condition where an individual has an extra copy of Chromosome 21 A Stroke involves the loss of brain function due to disruptions in blood flow to the brain. Albumin Deficiency -low levels a blood protein - is found in some individuals with liver disease. Which of the three conditions above could most likely be treated using products from bacterial transformation? Why?
1. Down syndrome is due to a. nondisjunction of chromosome 21. O b. nondisjunction of the X chromosome. c. one Y chromosome and two or more X chromosomes. d. nondisjunction of the Y chromosome.
2 BIO 302 MIDTERM (CH 7-8) 1 Cause of familial Down syndrome is 2. Gain of single chromosome leads to 7 Cotton plant is an example of Triploidy B. Trisomy C.Translocation A Trisomy B. Allopolyploidy C. Amphidiploidy D. Pentaploidy A. Diploidy B.Triploidy C. Tetraploidy D. Trisomy E Monosomy What is "normal chromosome number? 18. What doesn't happen in endopolyploidy'or 3. Diploidy B. Triploidy C. Tetraploidy D. Trisomy EMonosomy 4. Multiple of same genome could be termed as A. Division of...
19. A couple's only child has Down Syndrome. An examination of the child's karyotype reveals that he has 46 chromosomes per cell, but that one chromosome is unusually large, and appears include large portions of chromosome 14 and chromosome 21. The couple fears that if they have another child, it will also have Down Syndrome. a. Estimate the probability that their next child would have Down Syndrome. Show your work. b. The mother is 25 and learned from her genetics...
Please show calculation steps for this. Thank you
Familial down syndrome is due to a Robesonian translocation that fuses chromosome 21 to chromosome 14 (most often). Individuals that have this translocated chromosome but no symptoms of Down syndrome are called translocation carriers. How many chromosomes do translocation carriers have (human diploid cells are typically 2N=46)? If an individual has a Down syndrome caused by the presence of this type of Robesonian translocation, how many chromosomes do they have?
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