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