Question

Read the sources given and answer any four from the questions given below:

Meiosis is a process of reductional division in which the amount of genetic material is reduced to half. If the parent body is diploid, the gametes are produced by meiosis. The parent organisms have specialised cells called meiocytes, also called gamete mother cells that undergo the process of meiosis. During meiosis, these cells undergo two successive nuclear and cell divisions with a single cycle of DNA replication. Gametes produced are haploid and contain only one set of chromosomes. Gametogenesis is the process of the formation of gametes. The gametes may be similar lookingor may differ markedly as in higher animals. When the male and female gametes are similar in appearance and cannot be distinguished morphologically then they are called homogametes or isogametes. When the gametes are morphologically different, they are termed heterogametes or anisogametes. Male gamete is generally small and is called antherozoid or sperm. Female gamete is generally large and is called egg or ovum.

1. When the gametes are morphologically different, they are called
   1. isogametes
   2. anisogametes
   3. homogametes
   4. both isogametes and homogametes
2. A male gamete that differs from a female gamete is
   1. bigger than female gamete
   2. diploid
   3. called antherozoid
   4. undergoes DNA replication twice
3. Meiocytes are the special cells which are
   1. also called gamete mother cells
   2. also called gametes
   3. haploid
   4. also called heterogametes
4. Which of the following statements is not true of meiosis?
   1. cells undergo two successive nuclear divisions
   2. the chromosome number is halved
   3. haploids produced have only one set of chromosomes
   4. DNA replication occurs twice
5. The process of formation of gametes is called
   1. meiogenesis
   2. gametogenesis
   3. heterogenetic
   4. meiocytes

Answer 1

1. anisogametes
2. called antherozoid
3. also called gamete mother cells
4. DNA replication occurs twice
5. gametogenesis