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 : 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 : .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.
Last Answer : (d) Down’s syndrome.
Description : A disease caused by an autosomal primary non- disjunction is : (1) Klinefelter's Syndrome(2) Turner's Syndrome (3) Sickel Cell Anemia (4) Down's Syndrome
Last Answer : (4) Down's Syndrome
Description : Meiosis I is reductional division. Meiosis II is equational division due to (a) pairing of homologous chromosomes (b) crossing over (c) separation of chromatids (d) disjunction of homologous chromosomes.
Last Answer : (c) separation of chromatids
Description : .A person with the sex chromosomes XXY suffers from (a) gynandromorphism (b) Klinefelter’s syndrome (c) Down’s syndrome (d) Turner’s syndrome.
Last Answer : (b) Klinefelter’s syndrome
Description : Crossing over in diploid organism is responsible for (a) segregation of alleles (b) recombination of linked alleles (c) dominance of genes (d) linkage between genes.
Last Answer : b) recombination of linked alleles
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.
Description : .Down’s syndrome in humans is due to (a) three ‘X’ chromosomes (b) three copies of chromosome 21 (c) monosomy (d) two ‘Y’ chromosomes.
Last Answer : b) three copies of chromosome 21
Description : If Mendel had studied the seven traits using a plant with 12 chromosomes instead of 14, in what way would his interpretation have been different? (a) He would not have discovered the law of ... c) He could have mapped the chromosome. (d) He would have discovered blending or incomplete dominance.
Last Answer : He would not have discovered the law of
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 : 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 : .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 : How many chromosomes per cell does a Down's Syndrome (trisomy 21) victim have?
Last Answer : ANSWER: 47
Description : Lesch-Nyhan syndrome, the sex linked, recessive absence of HGPRTase, may lead to (A) Compulsive self destructive behaviour with elevated levels of urate in serum (B) Hypouricemia due to liver damage (C) Failure to thrive and megaloblastic anemia (D) Protein intolerance and hepatic encephalopathy
Last Answer : Answer : A
Description : Lesch-Nyhan syndrome, the sex linked recessive disorder is due to the lack of the enzyme: (A) Hypoxanthine-guanine phosphoribosyl transferse (B) Xanthine oxidase (C) Adenine phosphoribosyl transferase (D) Adenosine deaminase
Description : Arrange the following events of meiosis in the correct sequence - A. Terminalisation of chiasmata B. Crossing over C. Synapsis D. Disjunction of chrom
Last Answer : Arrange the following events of meiosis in the correct sequence - A. Terminalisation of chiasmata ... ` C. `CtoBtoDtoEtoA` D. `CtoBtoEtoAtoD`
Description : What is Sex- Linked Inheritance ?
Last Answer : Sex-linked heredity is the transmission of sex-linked traits through sex chromosomes.
Description : $ Sicke cell anaemia is a type of pleiotropy. ! Sex linked inharitance is also called criss cross inheritance.
Last Answer : $ Sicke cell anaemia is a type of pleiotropy. ! Sex linked inharitance is also called criss cross inheritance ... wrong D. If both As and R are wrong.
Description : Why do-sex linked traits follow different patterns of inheritance than other traits?
Last Answer : Sexlinked traits follow a different pattern of inheritance thana non-sex linked trait because of the size difference between the Xand y chromosomes.Think about non-sex chormosomes as being the same size, eachhaving ... of the daughters will be carriers (Aa) and all the sons willbe normal (A-).
Description : A genetically diseased father (male) marries with a normal female and gives birth to 3 carrier girls and 5 normal sons. It may be which type of genetic disease? (a) Sex-influenced disease (b) Blood group inheritance disease (c) Sex-linked disease (d) Sex-recessive disease
Last Answer : (c) Sex-linked disease
Description : A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5 sons). Three of the sons suffer from the given disease but none ... ? (a) Sex-linked dominant (b) Sex-linked recessive (c) Sex-limited recessive (d) Autosomal dominant
Last Answer : (b) Sex-linked recessive
Description : Study the pedigree chart given below. What does it show? (a) Inheritance of a condition like phenylketonuria as an autosomal recessive trait. (b) The pedigree chart is wrong as this is ... disease like haemophilia. (d) Inheritance of a sex-linked inborn error of metabolism like phenylketonuria
Last Answer : (a) Inheritance of a condition like phenylketonuria as an autosomal recessive trait.
Description : Which of the following suggests a diagnosis of Hurler's Syndrome rather than Hunter's Syndrome? 1) X-linked inheritance 2) Mental retardation 3) Skeletal abnormalities 4) Cloudy cornea 5) Cardiomyopathy
Last Answer : Answers-4 Hunter's Syndrome (MPS-2) is of X-linked inheritance. The cornea are clear. The skeletal involvement tends to be mild with no gibbous present, though scoliosis is ... and gibbous deformation of the spine is characteristic. There is the characteristic coarse facies with hepatosplenomegaly.
Description : Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to (a) repulsion (b) recombination (c) linkage (d) crossing over.
Last Answer : (c) linkage
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 : Coupling and repulsion are the two states of – (1) linkage (2) chiasma (3) mutation (4) crossing over
Last Answer : (1) linkage Explanation: Genetic linkage is the tendency of genes that are located proximal to each other on a chromosome to be inherited together during meiosis. The figure below depicts the gamete composition for linked genes from coupling and repulsion crosses:
Description : Which of the following process is not takes place in evolution of plants? (A)Crossing over (B) Mutation (C) Linkage (D) Coupling
Last Answer : (C) Linkage
Description : Bateson used the terms coupling and repulsion for linkage and crossing over. Name the correct parental of coupling type alongwith its cross over or repulsion. (a) Coupling AABB, aabb; Repulsion AABB, ... c) Coupling aaBB, aabb; Repulsion AABB, aabb (d) Coupling AABB, aabb; Repulsion AAbb, aaBB
Last Answer : (d) Coupling AABB, aabb; Repulsion AAbb, aaBB
Description : Segregation of Mendelian factors (no linkage, no crossing over) occurs during (a) anaphase I (b) anaphase II (c) diplotene (d) metaphase I.
Last Answer : a) anaphase I
Description : The movement of a gene from one linkage group to another is called (a) translocation (b) crossing over (c) inversion (d) duplication
Last Answer : (c) inversion
Description : The mechanism that causes a gene to move from one linkage group to another is called (a) inversion (b) duplication (c) translocation (d) crossing-over.
Last Answer : (c) translocation
Description : Coupling and repulsion are the two states of : (1) linkage (2) chiasma (3) mutation (4) crossing over
Last Answer : linkage
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 : Crossing over takes place between which chromatids and in which stage of the cell cycle ? (a) Non-sister chromatids of non-homologous chromosomes at Zygotene stage of prophase I. (b) Non- ... prophase I. (d) Non-sister chromatids of non-homologous chromosomes at Pachytene stage of prophase I.
Last Answer : (b) Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I.
Description : All the following statements about primary gout are true except (A) Its inheritance is X-linked recessive (B) It can be due to increased activity of PRPP synthetase (C) It can be ... activity of hypoxanthine guanine phosphoribosyl transferase (D) De novo synthesis of purines is increased in it
Last Answer : Answer : C
Description : The monosaccharide units are linked by 1 → 4 glycosidic linkage in (A) Maltose (B) Sucrose (C) Cellulose (D) Cellobiose
Last Answer : A
Description : Cross linked polymers formed from bi-and trifunctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer __________ properties. (A) Thermoplastic (B) Thermosetting (C) Elastometric (D) Brittleness
Last Answer : (C) Elastometric
Description : Number of chromosomes in Down's syn- drome is?
Last Answer : 47
Description : $ Haemophilia is a sex linked disease ! Haemophilia is due to a recessive gene.
Last Answer : $ Haemophilia is a sex linked disease ! Haemophilia is due to a recessive gene. A. If both As and R are ... R is wrong D. If both As and R are wrong.
Description : Independent assortment of genes does not take place when (a) genes are located on homologous chromosomes (b) genes are linked and located on same chromosome (c) genes are located on non-homogenous chromosome (d) all of these.
Last Answer : genes are linked and located on same chromosome
Description : why crossing over cannot occur of linked genes -Biology
Last Answer : answer:
Description : Select the incorrect statement from the following. (a) Galactosemia is an inborn error of metabolism. (b) Small population size results in random genetic drift in a population. (c) Baldness is a sex-limited trait. (d) Linkage is an exception to the principle of independent assortment in heredity
Last Answer : (c) Baldness is a sex-limited trait.
Description : Which of the following pairs is wrongly matched? (a) Starch synthesis in pea : Multiple alleles (b) ABO blood grouping : Co-dominance (c) XO type sex determination: Grasshopper (d) T.H. Morgan : Linkage
Last Answer : (a) Starch synthesis in pea : Multiple alleles
Description : Which of the following pairs in wrongly matched ? (1) Starch synthesis in pea : Multiple alleles (2) ABO blood grouping : Co-dominance (3) XO type sex determination : Grasshopper (4) T.H. Morgan : Linkage
Last Answer : (1) Starch synthesis in pea : Multiple alleles
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.