the parents will be a) I A I A and I B I o b) I A I o and I B I o c) I A I o and I o I o d) I o I o and I B I B . XO type of sex determination and XY type of sex determination are examples of a) Male heterogamety b) Female heterogamety c) Male homogamety d) Both (b) and (c) . In an accident there is great loss of blood and there is no time to analyse the blood group which blood can be safely transferred? a) O and Rh negative b) O and Rh positive c)B and Rh negative d) AB and Rh positive .
Father of a child is colourblind and mother is carrier for colourblindness, the probability of the child being colourblind is a) % b) % c) % d) % XII Std Biology-Zoology Chapter- XII Std Biology-Zoology Chapter- Principles of Inheritance and Variation . Which of the following is incorrect regarding ZW-ZZ type of sex determination? a) It occurs in birds and some reptiles b) Females are homogametic and males are heterogametic c) Males produce one types of gamete d) It occurs in gypsy moth . What is haplodiploidy?
. Distinguish between heterogametic and homogametic sex determination systems. . What is Lyonisation?
. What is criss-cross inheritance? . Why are sex linked recessive characters more common in the male human beings?
. What are holandric genes? . Mention the symptoms of Phenylketonuria.
. Mention the symptoms of Down's syndrome. . Explain the genetic basis of ABO blood grouping in man.
. How is sex determined in human beings? . What is male heterogamety?
. Brief about female heterogamety. . Give an account of genetic control of Rh factor.
. Explain the mode of sex determination in honeybees. . What are the applications of Karyotyping?
. Explain the inheritance of sex linked characters in human being. . A marriage between a colourblind man and a normal woman produces a) All carrier daughters and normal