151. Genes found on both X and Y chromosomes are called:
Answer: C. X-Y linked (pseudo-autosomal)
Biology Class 11 Unit 12: Inheritance MCQs
228 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 4 of 5.
Tap an option to check your answer.
152. Wild type refers to:
Answer: B. organisms with normal characteristics
153. Morgan crossed a white-eyed male Drosophila to a red-eyed female. The F1 flies were:
Answer: B. all red eyed
154. In F2 of Morgan's cross, all white-eyed flies were:
Answer: B. male
155. Morgan concluded that the gene for eye colour is located on the:
Answer: C. X chromosome
156. In Drosophila a white-eyed female genotype is:
Answer: C. XrXr
157. A white-eyed male fly has genotype:
Answer: B. XrY
158. Examples of X-linked recessive traits in humans are:
Answer: C. haemophilia and colour blindness
159. An X-linked dominant disease is:
Answer: C. hypophosphatemic (vitamin D resistant) rickets
160. A carrier woman of an X-linked recessive disease:
Answer: B. does not show the disease but passes it to 50 percent of offspring
161. All daughters of an affected father with an X-linked recessive trait will be:
Answer: B. carriers
162. No sons of an affected father inherit his X-linked trait because:
Answer: B. sons receive his Y chromosome, not the X
163. Y-linked traits are also called:
Answer: B. holandric traits
164. Y-linked traits pass:
Answer: C. father to son
165. An example of a Y-linked character in humans is:
Answer: C. hypertrichosis (hairy pinna)
166. Haemophilia is a disease in which:
Answer: B. blood fails to clot properly
167. The haemophilia types A and B are:
Answer: B. X-linked recessive
168. Haemophilia C is:
Answer: B. autosomal recessive
169. Haemophilia A is due to the deficiency of clotting factor:
Answer: C. VIII
170. Haemophilia B is due to the deficiency of factor:
Answer: B. IX
171. The percentage of haemophilia A cases is about:
Answer: C. 80
172. Haemophilia B represents about:
Answer: B. 20 percent
173. The number of known clotting factors is:
Answer: C. 13
174. Factor I is also called:
Answer: B. fibrinogen
175. The final step of the clotting cascade converts fibrinogen into:
Answer: B. fibrin
176. The haemophilia A treatment using a genetically engineered factor VIII is:
Answer: B. octocog alfa
177. Mild haemophilia A can be treated with:
Answer: B. desmopressin
178. A woman can suffer from haemophilia only when she is:
Answer: B. homozygous recessive
179. Haemophilia affects:
Answer: B. men more than women
180. The normal colour vision is based on how many kinds of cones?
Answer: B. Three
181. The genes for red and green opsins are on the:
Answer: B. X chromosome
182. The gene for blue opsin is on:
Answer: C. autosome 7
183. A person who can perceive only two primary colours is a:
Answer: B. dichromat
184. A person who can see only one colour is a:
Answer: B. monochromat
185. Red-green colour blindness is more common in:
Answer: B. men
186. A carrier woman marrying a normal man will have colour blind sons in what proportion?
Answer: C. 50 percent of the sons
187. Pedigree analysis is used to study inheritance in:
Answer: C. humans
188. In a pedigree, a square represents a:
Answer: B. male
189. In a pedigree, a circle represents a:
Answer: A. female
190. Amniocentesis involves the extraction of:
Answer: C. about 20 ml of amniotic fluid
191. In amniocentesis the foetal cells are:
Answer: B. cultured, stained and examined for chromosome abnormalities
192. Down syndrome is detected in amniocentesis as:
Answer: B. trisomy 21
193. Chorionic villus sampling takes a sample from the:
Answer: B. placenta
194. Chorionic villi are derived from the:
Answer: B. foetus and have the same genotype as the foetus
195. Chorionic villus sampling can be done:
Answer: B. earlier than amniocentesis through the cervix or abdominal wall
196. When a Rh-negative woman marries a Rh-positive DD man, all offspring are:
Answer: B. Dd and Rh positive
197. A cross between an albino man and a woman with albino father, as albinism is recessive, gives:
Answer: C. 1 normal : 1 albino
198. A man of blood group B and woman of group A can have children of:
Answer: D. A, B, AB or O
199. The Rh system is encoded by three tightly linked genes at:
Answer: B. two loci in total, three genes C, D, E
200. Multiple alleles can provide many phenotypes because:
Answer: B. many combinations of the alleles are possible in diploid individuals
About Biology Class 11 Unit 12 MCQs (Federal Board)
These 228 Biology MCQs cover Class 11 Unit 12: Inheritance of the Federal Board (FBISE) HSSC-I (1st Year / Class 11) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 5 pages of 50. Use the Print button to save this chapter as a PDF.