Posted inunclassified Genetics 2 Posted by By Agodirin September 15, 2024 Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 3 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950 Created by Agodirin Genetics & Variation 2 There are 50 multiple choice questions in this MCQ. The pass mark is 90%. Best of Luck 1 / 50 1. The DNA molecule is a chain of repeating A) Nucleosides B) Nucleotides C) Nitrogenous bases D) Phosphate sugars 2 / 50 2. The inheritable characters that are determined by a gene located on the X- chromosome is A) Recessive B) Dominant C) Homologous D) Sex-linked 3 / 50 3. Which of the following is true of the children of a hemophilic man who marries a woman that is not hemophilic and does not carry the trait? A) All sons will be hemophilliac B) All daugthers will be hemophilliac C) All sons will be carriers D) All daugthers will be carriers 4 / 50 4. Sex-linked traits are located on A) Y chromosome B) Homologous chromosomes C) X chromosome D) X and Y chromosomes 5 / 50 5. If a dark-skinned woman (Bb) marries an albino man (bb) and they have four children, how many of the children will be dark-skinned? A) three B) one C) None D) two 6 / 50 6. A mammal with red fur and long ears was crossed with another having white fur and short ears. If the offspring had red fur and short ears, then A) The characters are linked B) the parents are related C) the parents are not related D) The characters are not linked 7 / 50 7. A man who is heterozygous for hemophillia marries a woman who is double recessive, what percentage of their children will have hemophilia A) 75% B) 50% C) none D) 25% 8 / 50 8. Which of the following is sex linked A) albinism B) color blindness C) tongue rolling D) dwarfism 9 / 50 9. An accurate identification of an offender(for example a rapist) can be carried out by A) DNA analysis B) Blood group C) behavior trait D) RNA analysis 10 / 50 10. Both recessive and dominant characters are found on A) on different chromosomes B) the same locus of homologous chromosome C) on mothers gamete D) on mother's X chromosome 11 / 50 11. The basic point of impact which leads to mutation is A) Phenotype B) Gamete C) Zygote D) Chromosome 12 / 50 12. The character producing factors in living organisms are A) Chromosome B) genes C) Chromomere D) Chromatids E) Allele 13 / 50 13. When two parents are carriers of albinism gene, how many of their off-springs will be albinos A) 100% B) 25% C) 50% D) 75% 14 / 50 14. The probability of being a boy or girl depends on the A) Mother's X chromosome B) fathers sex cell C) mother's gamete D) father's somatic chomosome 15 / 50 15. A gene which expresses itself only in the homozygous condition is A) mutant B) lethal C) Recessive D) dominant 16 / 50 16. Which of the following is not correct about albinism A) the albinism gene is recessive B) The albinism gene manifest in heterozygous state C) Albinism is due to lack of melanin pigment in the malpighian layer of the skin D) Ablinism is due to lack of tyrosinase function 17 / 50 17. If a plant, homozygous for round and yellow (RR;YY), is crossed with a wrinkled green type (rr;yy), all of the resulting seeds will be A) wrinkled and blue-yellow B) Blue and wrinkled C) white and round D) Round and yellow 18 / 50 18. if a DNA stran has base sequence AGT, the complementary strand must be A) ACT B) TCA C) GAT D) TGT 19 / 50 19. The biological factor that is unique to all individual is A) Eye color B) Blood group C) DNA(DeoxyriboNucleic Acid) D) RNA 20 / 50 20. A tall plant crossed with a dwarf plant produces offspring of which half are tall and half are dwarf. What are the genotypes of the parents? A) Tt,tt B) TT,Tt C) Tt, Tt D) tt,tt 21 / 50 21. The hereditary material of the cell is: A) carbohydrate B) RNA C) DNA D) Protein 22 / 50 22. People with sickle-cell anaemia have haemoglobin: A) A and are heterozygous B) S and are homozygous C) A and are homozygous recessive D) S and are heterozygous 23 / 50 23. A cross where only one characteristic is considered is refered to as A) Unihybrid B) Singlehybrid C) Monohybrid D) Ultimatehybrid 24 / 50 24. A man who is a carrier of hemophilia trait marries a woman who is homozygous recessive, what percentage of their children will have hemophilia A) 75% B) none C) 25% D) 50% 25 / 50 25. A man an his wife are heterozygous for sickle cell trait, the percentage of their children that will be carriers or sicklers will be A) 75% B) 25% C) 100% D) 50% 26 / 50 26. The first four children of a couple were girls, the probability of the 5th being a girl is A) 50% B) 80% C) 20% D) 30% 27 / 50 27. A feature associated with Y chromosome in humans A) Enlarged breast B) Long eye lashes C) Facial hair D) Prominent fingernails 28 / 50 28. A colorblind man marrier a carrier woman, what percentage of their children will be colorblind A) 75% B) 50% C) 100% D) 25% 29 / 50 29. A man who has the trait for color blindness marries a normal woman. What percentage of their children would be sufferers, carriers, and normal respectively? A) 25%.25% and 50% B) 25%,50% C) 50%,25% and25% D) 25%,50% and 25% 30 / 50 30. Women do not suffer color bilindness because A) the trait is recessive and sex linked B) only men can be color blind C) The trait is linked to X and Y chromosomes D) the trait is sex linked 31 / 50 31. The correct ordering of the hereditary material based on size is A) Gene,Chromosome, Nucleus, DNA, B) Nucleus,Chromosome,Gene,DNA C) Chromosome, DNA, Gene, Nucleus D) DNA,Gene,Chromosome, Nucleus 32 / 50 32. A dog lost its tail in an accident, if it crosses another dog with normal tail, how many of the puppies will be born without tail A) 75% B) none C) 50% D) 25% 33 / 50 33. Aman with a normal haemoglobin (AA) marries a woman who has sickle-cell haemoglobin (SS).They have a child who has sickle-cell trait. Which of the following genotypes could be associated with the child’s haemoglobin ? A) AO B) AS C) AA D) SS 34 / 50 34. If the Allelel for baldness is Bb, a female carrier will have what chromosome A) XbXb B) XBY C) XbYb D) XBXb 35 / 50 35. In the gene locus for eye colour in humans, the allele for brown eyes is dominant over the allele for blue eyes. If a homozygous brown-eyed girl has a brother with blue eyes, what are the likely phenotypes of their parents’ eye colour? A) Both parents have brown eyes B) Both parents have blue eyes C) father has blue eyes and mother brown D) Mother has blue eyes and father brown eyes 36 / 50 36. A man with blood group A is married to a woman with blood group A. Which of the following group combinations is possible if the family has three children? A) A,O, A B) B,O, A C) A, B, AB D) A,O,B 37 / 50 37. The F1 of a cross between a tall and a dwarf plant was tall. The F1 was advanced to F2. How many of 120 F2 plants will be dwarf? A) 30 B) 60 C) 120 D) 90 38 / 50 38. The number of chromosomes in each somatic cell is A) 2N B) 3N C) N D) 4N 39 / 50 39. Which of the following is monohybrid cross A) A cross between a short plant with round white leaves and a short plant with wrinkled red leaves B) A marriage between a light skined man with blue eyes and a dark skined woman with brown eyes C) A cross between Tall plant with red leaves and a Short plant with white leaves D) A marriage between a tall man with brown eyes and a tall woman with blue eyes 40 / 50 40. Which of the following is correct about a recessive allele A) it manifests in heterozygous state B) it is X-linked C) it is Y-linked D) it manifestes in homozygous state 41 / 50 41. If a woman’s genotype is Tt Qq Rr, what would be the gene content of her eggs? A) TQr, tqr B) TQr, tqR C) tqR, TQr D) TqR, tQr Given a woman’s genotype of Tt Qq Rr, the gene content of her eggs can be determined by considering the possible combinations of alleles she can pass on. Each egg will receive one allele from each gene pair (T or t, Q or q, R or r). 42 / 50 42. Which of the following will result from a cross between Yy and Yy A) 3YY,yy B) YY,2Yy,yy C) YY,Yy,2YY D) 2YY,2yy 43 / 50 43. Which of the following is a discontinuous variation A) weight B) left handedness C) Color of skin D) height 44 / 50 44. A yellow maize is planted, and all the fruits obtained have yellow seeds. When they are cross-bred, yellow seeds and white seeds are obtained in a ratio of 3:1. The yellow seed is said to be: A) sex-linked B) Dominant C) Recessive trait D) Non-inheritable 45 / 50 45. In a mendelian cross of red and white plant, the exhibition of incomplete dorminance in the off-spring will give A) pink plant B) multicolored plant C) white plant D) red plant 46 / 50 46. If a DNA strand has base sequence ACT, the complementary stand must be A) TGT B) ACT C) TGA D) GAT 47 / 50 47. If XN is the dominant allele for color blindness and Xn is the recessive allele. A boy with chromome YXn will be A) carrier of color blindness B) normal vision C) color blind D) completely blind 48 / 50 48. If R and r denote the genes for a character, the offspring of the cross between RR and Rr are: A) RR, 2Rr and rr B) 2RR and 2rr C) 4Rr D) 2RR and 2Rr 49 / 50 49. The ratio of carriers to sicklers in the F1 generation derived from a parental cross of two carriers of the hemoglobin S gene is: A) ratio 1:3 B) ratio 1:2 C) ratio 2:1 D) ratio 3:1 The F1 generation from two carriers (heterozygous) will produce 1 normal (AA), 2 carriers (AS), and 1 sickler (SS) in a 1:2:1 ratio. 50 / 50 50. The sex-linked defect in which very slight cuts produce severe bleeding is known as: A) Anemia B) Hemolysis C) Hemophilia D) Anorexia Your score is LinkedIn Facebook Twitter VKontakte Restart quiz Share via: Facebook X (Twitter) LinkedIn More Agodirin View All Posts Post navigation Previous Post Genetics 1Next PostGenetics 3
