101. Polygenes show ... effect:
Answer: B. additive
Biology Class 11 Unit 12: Inheritance MCQs
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102. Wheat grain colour is controlled by how many gene pairs?
Answer: C. Three
103. In wheat the number of phenotypes in the F2 is:
Answer: C. 7
104. The F2 ratio of wheat grain colour from dark red x white is:
Answer: B. 1:6:15:20:15:6:1
105. The F1 grain colour in wheat dark red x white is:
Answer: C. light red (intermediate)
106. A wheat grain of genotype AaBbCc is:
Answer: C. light red
107. A wheat grain with genotype AABBCC is:
Answer: C. dark red
108. Human skin colour is regulated by at least how many gene pairs?
Answer: C. Three
109. Skin pigmentation depends upon:
Answer: C. melanin
110. The genotype AaBbCc in skin colour is characteristic of a:
Answer: C. mulatto (intermediate)
111. Epistasis is the phenomenon in which:
Answer: B. a gene at one locus masks or suppresses the effect of a gene at another locus
112. The gene that masks the other gene is called:
Answer: B. epistatic
113. The gene which is suppressed is:
Answer: B. hypostatic
114. Dominance involves:
Answer: B. a single pair of alleles at one locus
115. Epistasis involves:
Answer: B. two pairs of alleles at different loci
116. Epistasis shows ... variation while polygenic inheritance shows ... variation:
Answer: B. discontinuous; continuous
117. Coat colour in Labrador retriever is an example of:
Answer: C. epistasis
118. In Labradors the allele for black is:
Answer: B. dominant to chocolate
119. A yellow Labrador must have genotype:
Answer: C. ee
120. Crossing BbEe x BbEe in Labradors gives the ratio of black:chocolate:yellow as:
Answer: C. 9:3:4
121. Foxglove flower colour shows:
Answer: B. dominant epistasis with a 12:3:1 ratio
122. Genes located on the same chromosome that tend to be inherited together are:
Answer: B. linked genes
123. The phenomenon of linked genes staying together is called:
Answer: B. gene linkage
124. Linkage on the sex chromosome is called:
Answer: B. sex linkage
125. The number of linkage groups in an organism equals its:
Answer: B. haploid number of chromosomes
126. In a test cross of a dihybrid the ratio 1:1:1:1 indicates:
Answer: C. no linkage (independent assortment)
127. If only parental types are produced in a test cross, the linkage is:
Answer: C. complete
128. The linkage in Drosophila was shown by:
Answer: B. T. H. Morgan
129. Morgan worked with:
Answer: B. fruit fly Drosophila melanogaster
130. The dihybrid ratio in complete linkage in Morgan's experiment became:
Answer: C. 3:1
131. The recombination of linked genes occurs due to:
Answer: B. crossing over
132. Crossing over takes place in:
Answer: B. prophase I of meiosis
133. Crossing over modifies:
Answer: B. the progeny by producing recombinants
134. One map unit equals:
Answer: B. 1 percent crossing over (recombination)
135. The frequency of crossing over is governed mainly by the:
Answer: B. distance between genes
136. Drosophila has how many chromosomes?
Answer: B. 8
137. Chromosomes other than the sex chromosomes are:
Answer: B. autosomes
138. Humans have how many pairs of autosomes?
Answer: C. 22
139. In humans, the sex chromosomes of a female are:
Answer: B. XX
140. In humans, the sex chromosomes of male are:
Answer: B. XY
141. The human male is:
Answer: B. heterogametic
142. The human female is:
Answer: A. homogametic, producing only X-bearing eggs
143. The sex of the child is determined by the:
Answer: B. sperm
144. A sperm with X chromosome fertilizing an egg produces:
Answer: B. a girl
145. The sex ratio of human offspring is:
Answer: B. 1:1
146. The probability of a boy in the fifth pregnancy after four daughters is:
Answer: C. 1/2
147. The gene SRY is located on the:
Answer: B. Y chromosome
148. SRY stands for:
Answer: B. Sex-determining Region Y
149. The arrangement of chromosomes in a cell is called:
Answer: B. karyotype
150. Traits controlled by genes on sex chromosomes are:
Answer: B. sex-linked
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.