Description : A woman with 47 chromosomes due to three copies of chromosome 21 is characterised by (a) superfemaleness (b) triploidy (c) Turner’s syndrome (d) Down’s syndrome.
Last Answer : (d) Down’s syndrome.
Description : Nondisjunction of a chromosome results in which of the following diagnoses? a) Down Syndrome When a pair of chromosomes fails to separate completely and creates a sperm or oocyte that contains two ... genetic condition that may occur in a single family member as a result of spontaneous mutation.
Last Answer : a) Down Syndrome When a pair of chromosomes fails to separate completely and creates a sperm or oocyte that contains two copies of a particular chromosome (nondisjunction) Down syndrome results from three number 21 chromosomes.
Description : Down’s syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder? (a) 100% (b) 75% (c) 50% (d) 25%
Last Answer : (c) 50%
Description : How many chromosomes per cell does a Down's Syndrome (trisomy 21) victim have?
Last Answer : ANSWER: 47
Description : Which of the following is a correct match? (a) Down’s syndrome - 21st chromosome (b) Sickle cell anaemia - X-chromosome (c) Haemophilia - Y-chromosome (d) Parkinson’s disease - X and Y chromosome
Last Answer : a) Down’s syndrome - 21st chromosome
Description : Down’s syndrome is due to (a) crossing over (b) linkage (c) sex-linked inheritance (d) non-disjunction of chromosomes.
Last Answer : (d) non-disjunction of chromosomes.
Description : An abnormal human male phenotype involving an extra X-chromosome (XXY) is a case of (a) Edward’s syndrome (b) Klinefelter’s syndrome (c) intersex (d) Down’s syndrome.
Last Answer : (b) Klinefelter’s syndrome
Description : .In which of the following diseases, the man has an extra X-chromosome? (a) Turner’s syndrome (b) Klinefelter’s syndrome (c) Down’s syndrome (d) Haemophilia
Description : .Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage? (a) Erythroblastosis fetalis - X-linked (b) Down’s syndrome - 44 autosomes + XO (c) Klinefelter’s syndrome - 44 autosomes + XXY (d) Colour blindness - Y-linked
Last Answer : (c) Klinefelter’s syndrome - 44 autosomes + XXY
Description : .In human beings 45 chromosomes/single X/XO abnormality causes (a) Down’s syndrome (b) Kinefelter’s syndrome (c) Turner’s syndrome (d) Edward’s syndrome
Last Answer : (c) Turner’s syndrome
Description : Down's Syndrome most often results from the presence of a third copy of which chromosome?
Last Answer : ANSWER: CHROMOSOME 21
Description : .A person with the sex chromosomes XXY suffers from (a) gynandromorphism (b) Klinefelter’s syndrome (c) Down’s syndrome (d) Turner’s syndrome.
Description : .A human female with Turner’s syndrome (a) has 45 chromosomes with XO (b) has one additional X chromosome (c) exhibits male characters (d) is able to produce children with normal husband.
Last Answer : (a) has 45 chromosomes with XO
Description : Cri-du-chat syndrome in humans is caused by the (a) trisomy of 21st chromosome (b) fertilisation of an XX egg by a normal Y-bearing sperm (c) loss of half of the short arm of chromosome 5 (d) loss of half of the long arm of chromosome 5.
Last Answer : (c) loss of half of the short arm of chromosome 5
Description : Down Syndrome, a congenital genetic disorder in human beings, is cased by : (a) a defective recessive gene in homozygous condition (b) an extra x chromosome (c) trisomy of chromosome 18 (d) trisomy of chromosome 21
Last Answer : Ans:(d)
Description : Mongolian Idiocy due to trisomy in 21st chromsome is called (a) Down’s syndrome (b) Turner’s syndrome (c) Klinefelter’s syndrome (d) Triple X syndrome
Last Answer : (a) Down’s syndrome
Description : Pick out the correct statements. (1) Haemophilia is a sex-linked recessive disease. (2) Down's syndrome is due to aneuploidy. (3) Phenylketonuria is an autosomal recessive gene disorder. (4) Sickle cell anaemia is an X- ... are correct. (c) (1) and (4) are correct. (d) (2) and (4) are correct.
Last Answer : (b) (1), (2) and (3) are correct.
Description : The formation of multivalents at meiosis in diploid organism is due to: (a) Monosomy (b) Delection (c) Inversion (d) Reciprocal translocation
Last Answer : Ans. ((d))
Description : .Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child? (a) Two X chromosomes (b) Only one Y chromosome (c) Only one X chromosome (d) One X and one Y chromosome
Last Answer : (a) Two X chromosomes
Description : Regarding the human chromosomes a. there are 23 pairs autosomal chromosomes b. the Y chromosome is larger than the X chromosome c. cells containing YO chromosome are not compatible with life d. Barr body is caused by the presence of an inactive X chromosome
Last Answer : cells containing YO chromosome are not compatible with life
Description : .Of a normal couple, half the sons are haemophiliac while half the daughters are carriers. The gene is located on (a) X-chromosome of father (b) Y-chromosome of father (c) one X-chromosome of mother (d) both the X-chromosomes of mother
Last Answer : (c) one X-chromosome of mother
Description : In Drosophila, the sex is determined by (a) the ratio of number of X-chromosome to the sets of autosomes (b) X and Y chromosomes (c) the ratio of pairs of X-chromosomes to the pairs of autosomes (d) whether the egg is fertilized or develops parthenogenetically.
Last Answer : (c) the ratio of pairs of X-chromosomes to the pairs of autosomes
Description : True statements about chromosome include: a. 23 chromosomes are found in germinal cells b. in female only one chromosome is activated c. the Barr body is due to inactivated X chromosome e. all above
Last Answer : all above
Description : Which one of the following conditions correctly describes the manner of determining the sex? (a) Homozygous sex chromosomes (ZZ) determine female sex in birds. (b) XO type of sex chromosomes ... s syndrome, determines female sex. (d) Homozygous sex chromosomes (XX) produce male in Drosophila.
Last Answer : (b) XO type of sex chromosomes determine male sex in grasshopper.
Description : The colour blindness is more likely to occur in males than in females because (a) the Y-chromosome of males have the genes for distinguishing colours (b) genes for characters are located on the sex- chromosomes (c) the trait is dominant in males and recessive in females (d) none of these.
Last Answer : (b) genes for characters are located on the sex- chromosomes
Description : Number of chromosomes in Down's syn- drome is?
Last Answer : 47
Description : .In Drosophila, the XXY condition leads to femaleness whereas in human beings the same condition leads to Klinefelter's syndrome in male. It proves (a) in human beings Y chromosome is active in ... (c) in Drosophila Y chromosome decides femaleness (d) Y chromosome of man have genes for syndrome.
Last Answer : (a) in human beings Y chromosome is active in sex determination
Description : Would it be hard for a prosperous, handsome man to fall in love with a woman with Downs' Syndrome?
Last Answer : Maybe she has a sweet, loving nature, which he could value and cherish. The things that connect people aren’t always obvious to the rest of us, but they can be very powerful.
Description : Are Down's Syndrome people happier than other people?
Last Answer : answer:The question is understandable. It often seems that they are happier based upon brief interactions and what is portrayed on television and movies. Down Syndrome is not a disease. It is a genetic ... parents. It is an opportunity to not only learn more about DS but make some new friends.
Description : What would you think of someone who suggested that the Korean infants she saw looked like they might have Downs syndrome?
Last Answer : I would ask what are her qualifications to know what she’s assuming.
Description : A couple, both severely retarded/down's syndrome/etcetera: should society literally prevent them from having children?
Last Answer : Your other question was easier. Neither of them are able to take care of the child?
Description : Apart from monkeys or the ape family, in what other species has Down's syndrome been detected?
Last Answer : Mice can have downs as well and science is using them to study the issue. It is caused by the presence of all or part of an extra 21st chromosome.
Description : Symptoms and causes of Down's syndrome? -Biology
Last Answer : answer:
Description : I'm over 35, I'm only in my early pregnancy, I'm 7 weeks old, but I'm really scared. I want to have a great baby, we have been waiting for it for a long time, 1.5 years and I don't know what if ...
Last Answer : You shouldn't have to worry so much in advance, but of course I understand. Be sure to discuss with your partner what you want. It must be a responsible decision by two people.
Description : People with Down's syndrome invariably affected by: (1) Huntington's disease (2) Alzheimer's disease (3) Meningitis (4) Brain haemorrhage
Last Answer : (2) Alzheimer's disease Explanation: The best-known and most common chromosome abnormality in humans is Down's syndrome, a condition associated with an extra chromosome 21. Down's syndrome individuals ... develop this disease in their fourth or fifth decade of life, much sooner than other people
Description : Webbed neck is a characteristic of – (1) Down's syndrome (2) Turner's syndrome (3) Klinefelter's syndrome (4) Cri-du-chat syndrome
Last Answer : (2) Turner's syndrome Explanation: A webbed neck, or pterygium colli deformity, is a congenital skin fold that runs along the sides of the neck down to the shouldersit is a feature of Turner ... Syndrome (TS) is a condition in which a female is partly or completely missing an X chromosome.
Description : In Down’s syndrome of a male child, the sex complement is (a) XO (b) XY (c) XX (d) XXY.
Last Answer : (b) XY
Description : .Christmas disease is another name for (a) haemophilia B (b) hepatitis B (c) Down’s syndrome (d) sleeping sickness.
Last Answer : a) haemophilia B
Description : .A disease caused by an autosomal primary non- disjunction is (a) Klinefelter’s syndrome (b) Turner’s syndrome (c) Sickle cell anaemia (d) Down’s syndrome.
Description : What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia and is sterile? (a) Down’s syndrome (b) Turner’s syndrome (c) Klinefelter’s syndrome (d) Edward syndrome
Last Answer : Klinefelter’s syndrome
Description : The most striking example of point mutation is found in a disease called (a) Down’s syndrome (b) sickle cell anaemia (c) thalassaemia (d) night blindness.
Last Answer : (b) sickle cell anaemia
Description : Which of the following cannot be detected in a developing fetus by amniocentesis? (a) Down’s syndrome (b) Jaundice (c) Klinefelter’s syndrome (d) Sex of the fetus
Last Answer : (b) Jaundice
Description : In context of amniocentesis, which of the following statements is incorrect? (a) It can be used for detection of Down’s syndrome. (b) It can be used for detection of cleft palate. (c) It is usually done when a woman is between 14-16 weeks pregnant. (d) It is used for prenatal sex determination.
Last Answer : (b) It can be used for detection of cleft palate
Description : Which of the following conditions is not associated with periodontal destruction in primary teeth: a. Down’s syndrome. b. Steven Johnson’s syndrome. c. Hypophosphatasia. d. Papillon. Lefebvre syndrome. e. Cyclic neutropenia.
Last Answer : b. Steven Johnson’s syndrome.
Description : Which of the following is NOT characteristic of Down’s syndrome? A. Decreased neutrophil function B. Macroglossia C. Macrodontia D. An increased susceptibility to periodontal disease E. Congenitally missing teeth
Last Answer : C. Macrodontia
Description : Hypodontia can be seen in: A. Cleidocranial dysplasia “dysostosis” B. Down’s syndrome C. Papillon fever syndrome D. Rickets
Last Answer : B. Down’s syndrome
Description : Which of the following conditions is not associated with periodontal destruction in primary teeth: A. Down’s syndrome B. Steven Johnson’s syndrome C. Hypophosphatasia D. Papillon-Lefebvre syndrome E. Cyclic neutropenia
Last Answer : B. Steven Johnson’s syndrome
Description : Typical features of Down’s syndrome (Mongolism) do not include: A. Multiple immunodeficiencies B. Sever caries but minimal periodontal disease C. Susceptibility to infections D. Multiple missing teeth and malocclusion E. Hepatitis B carriage in institutionalised patients
Last Answer : B. Sever caries but minimal periodontal disease
Description : 28 years old woman with previous history of having baby with Down's Syndrome is now 12 weeks pregnant. Which of the following would you suggest to her: a) Amniocentesis. b) Obstetric ... sampling. d) Fetal blood sampling. e) Wait till eighteen weeks for detailed ultrasound and amniocentesis.
Last Answer : c) Chorionic villus sampling.