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. Sex-linked traits are located on A) Homologous chromosomes B) X chromosome C) Y chromosome D) X and Y chromosomes 2 / 50 2. 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 blue eyes B) Mother has blue eyes and father brown eyes C) father has blue eyes and mother brown D) Both parents have brown eyes 3 / 50 3. 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). 4 / 50 4. 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) 50%,25% and25% B) 25%,50% C) 25%.25% and 50% D) 25%,50% and 25% 5 / 50 5. 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) 50% B) 100% C) 75% D) 25% 6 / 50 6. People with sickle-cell anaemia have haemoglobin: A) S and are heterozygous B) A and are homozygous recessive C) S and are homozygous D) A and are heterozygous 7 / 50 7. The correct ordering of the hereditary material based on size is A) Nucleus,Chromosome,Gene,DNA B) DNA,Gene,Chromosome, Nucleus C) Gene,Chromosome, Nucleus, DNA, D) Chromosome, DNA, Gene, Nucleus 8 / 50 8. In a mendelian cross of red and white plant, the exhibition of incomplete dorminance in the off-spring will give A) multicolored plant B) pink plant C) white plant D) red plant 9 / 50 9. A feature associated with Y chromosome in humans A) Long eye lashes B) Enlarged breast C) Prominent fingernails D) Facial hair 10 / 50 10. 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) Non-inheritable D) Recessive trait 11 / 50 11. A colorblind man marrier a carrier woman, what percentage of their children will be colorblind A) 25% B) 75% C) 50% D) 100% 12 / 50 12. The first four children of a couple were girls, the probability of the 5th being a girl is A) 50% B) 30% C) 80% D) 20% 13 / 50 13. Both recessive and dominant characters are found on A) on different chromosomes B) on mother's X chromosome C) on mothers gamete D) the same locus of homologous chromosome 14 / 50 14. Women do not suffer color bilindness because A) the trait is recessive and sex linked B) The trait is linked to X and Y chromosomes C) the trait is sex linked D) only men can be color blind 15 / 50 15. A man who is heterozygous for hemophillia marries a woman who is double recessive, what percentage of their children will have hemophilia A) none B) 75% C) 25% D) 50% 16 / 50 16. A cross where only one characteristic is considered is refered to as A) Unihybrid B) Singlehybrid C) Ultimatehybrid D) Monohybrid 17 / 50 17. If the Allelel for baldness is Bb, a female carrier will have what chromosome A) XBXb B) XbYb C) XBY D) XbXb 18 / 50 18. Which of the following is not correct about albinism A) the albinism gene is recessive B) Ablinism is due to lack of tyrosinase function C) Albinism is due to lack of melanin pigment in the malpighian layer of the skin D) The albinism gene manifest in heterozygous state 19 / 50 19. if a DNA stran has base sequence AGT, the complementary strand must be A) GAT B) TCA C) ACT D) TGT 20 / 50 20. The sex-linked defect in which very slight cuts produce severe bleeding is known as: A) Hemolysis B) Anemia C) Hemophilia D) Anorexia 21 / 50 21. 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) SS C) AS D) AA 22 / 50 22. The basic point of impact which leads to mutation is A) Zygote B) Phenotype C) Gamete D) Chromosome 23 / 50 23. The probability of being a boy or girl depends on the A) mother's gamete B) father's somatic chomosome C) Mother's X chromosome D) fathers sex cell 24 / 50 24. 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,B B) A, B, AB C) A,O, A D) B,O, A 25 / 50 25. 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 26 / 50 26. 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 parents are not related B) The characters are linked C) the parents are related D) The characters are not linked 27 / 50 27. Which of the following is sex linked A) dwarfism B) albinism C) tongue rolling D) color blindness 28 / 50 28. The DNA molecule is a chain of repeating A) Nitrogenous bases B) Nucleosides C) Nucleotides D) Phosphate sugars 29 / 50 29. Which of the following will result from a cross between Yy and Yy A) 2YY,2yy B) YY,2Yy,yy C) YY,Yy,2YY D) 3YY,yy 30 / 50 30. Which of the following is a discontinuous variation A) Color of skin B) weight C) left handedness D) height 31 / 50 31. The number of chromosomes in each somatic cell is A) N B) 3N C) 2N D) 4N 32 / 50 32. 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) 25% C) 50% D) none 33 / 50 33. 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) Round and yellow B) white and round C) wrinkled and blue-yellow D) Blue and wrinkled 34 / 50 34. A gene which expresses itself only in the homozygous condition is A) mutant B) Recessive C) lethal D) dominant 35 / 50 35. Which of the following is correct about a recessive allele A) it is Y-linked B) it manifests in heterozygous state C) it is X-linked D) it manifestes in homozygous state 36 / 50 36. 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) two B) one C) three D) None 37 / 50 37. If a DNA strand has base sequence ACT, the complementary stand must be A) GAT B) TGT C) TGA D) ACT 38 / 50 38. The hereditary material of the cell is: A) DNA B) carbohydrate C) RNA D) Protein 39 / 50 39. 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 1:2 B) ratio 2:1 C) ratio 1:3 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. 40 / 50 40. The character producing factors in living organisms are A) Allele B) Chromomere C) Chromatids D) genes E) Chromosome 41 / 50 41. An accurate identification of an offender(for example a rapist) can be carried out by A) behavior trait B) Blood group C) RNA analysis D) DNA analysis 42 / 50 42. 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) 4Rr C) 2RR and 2rr D) 2RR and 2Rr 43 / 50 43. 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 daugthers will be carriers B) All daugthers will be hemophilliac C) All sons will be hemophilliac D) All sons will be carriers 44 / 50 44. The biological factor that is unique to all individual is A) Eye color B) Blood group C) DNA(DeoxyriboNucleic Acid) D) RNA 45 / 50 45. 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) 25% B) 50% C) none D) 75% 46 / 50 46. 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) 90 B) 30 C) 60 D) 120 47 / 50 47. Which of the following is monohybrid cross A) A marriage between a tall man with brown eyes and a tall woman with blue eyes 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 cross between a short plant with round white leaves and a short plant with wrinkled red leaves 48 / 50 48. If XN is the dominant allele for color blindness and Xn is the recessive allele. A boy with chromome YXn will be A) normal vision B) color blind C) completely blind D) carrier of color blindness 49 / 50 49. When two parents are carriers of albinism gene, how many of their off-springs will be albinos A) 50% B) 75% C) 100% D) 25% 50 / 50 50. The inheritable characters that are determined by a gene located on the X- chromosome is A) Sex-linked B) Dominant C) Homologous D) Recessive 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
