HARD WORK ALWAYS PAYS OFF

CHAPTER 3. INHERITANCE AND VARIATION

ASSIGNMENT -2

119. Why test cross is carried out?

120. What is test cross?

121. What is back cross?

122. State phenotypic and genotypic ratio of Monohybrid test cross and back cross

123. State phenotypic and genotypic ratio of dihybrid test cross and back cross?

124. What is post Mendelian or neo-mendelian genetics?

125. What are the types of gene interaction?

126. What is intragenic or interallelic interaction?

127. Give example of interallelic interaction

128. What is intergenic or nonallelic interaction?

129. What are the examples of intergenic interaction?

130. What is incomplete dominance?

131. What is the nature of phenotypic and genotypic ratio in incomplete dominance?

132. Name the plant which shows incomplete dominance.

133. Which is the intermediate character produced in Mirabilis?

134. What is codominance?

135. What are codominant alleles?

136. How many alleles express in codominance?

137. Which is the example of codominance?

138. What is the nature of phenotypic and genotypic ratio in codominance?

139. What is the basic difference in incomplete dominance and codominance?

140. What are multiple alleles?

141. Which phenomenon is not shown by multiple alleles?      

142. What is the genotype drosophila with normal wings?      

143. What is the genotype of drosophila with stumps and no wings?

144. Give the example of multiple allelism in human beings

145. Which gene controls ABO blood group system in humans?

146. What are the different alleles of gene I or Isoagglutinin?

147. How many alleles can be present in any human for gene I?

148. Which allele of I dues not produce any sugar?

149. How many different genotypes can be produced be gene I?

150. How many different phenotypic expressions are produced by gene I?

151. What is pleiotropic gene?

152. What is pleiotropy?

153. What is the ratio obtained in pleiotropy?

154. What is the example of pleiotropy?

155. In which condition sickle-cell anemia is lethal?

156. What is lethal gene?

157. What will be the expression of character if a marriage is between two carriers of sickle cell anemics?

158. What is continuous variation?

159. What is additive or cumulative effect?

160. What are cumulative genes?

161. What is the ratio obtained in wheat kernel because of cumulative genes?

162. What is the ratio obtained in human beings with respect to polygenes?

163. Who discovered polygenic inheritance in wheat kernel?

164. Which genes regulate kernel colour in wheat?

165. What are the different phenotypes obtained in F2 generation in cross involving wheat?

166. Which genes produce red and white pigments in wheat kernel?

167. How many plants with all four dominant and all four recessive genes in wheat kernel?

168. How many plants with minimum two dominant genes?

169. Who studied inheritance of Human skin colour?

170. What are mullatoes?

171. State the phenotypic ration produced in human skin colour expression?

172. Which three pairs of genes control human skin colour?

173. Which pigment decides skin colour?

174. What is the proportion of melanin synthesis?

175. State the genotypes of homozygous dominant and recessive genotypes in human skin colour.

176. How many different types of phenotypes are produced in skin colour inheritance pattern?

177. Which population will be maximum in number in a cross between Negro and white?

178. State the different phenotypes produced in human skin colour.

179. How many types of gametes are produced by Mullatoes?

180. What is the number of probable combinations produced in human skin colour in heritance in F2 generation?