QUESTION 1 1.1 Various options are provided as possible answers to the fothowing questions. Choose the answer and write only the letter ( \( A \) to \( D \) ) next to the question number ( 1.1 .1 to 1.1.4) in the ANSWER BOOK, for example 1.15 D . 1.1.1 Which ONE of the following chromosomes would be found in a normal human cell during metaphase I? A Single thread chromosomes showing variation B Double thread chromosomes showing no variation Double thread chromosomes showing variation Single thread chromosomes showing no variation 1.1.2 The following is a list of some functions that occur during gestation: (i) Diffusion of oxygen from the mother to the foetus (ii) Production of progesterone (iii) Diffusion of excretory wastes from the mother to the Foetus (iv) Diffusion of nutrients from the mother to the foetus Which ONE of the following is a correct combination of the functions the placenta? A (ii) only B (i), (ii) and (iv) only C (i), (iii) and (iv) only D (i), (ii), (iii) and (iv) 1.1.3 The Red kangaroo (Osphranter rufus) reproduces sexually and ha gestation period of 33 days. It then gives birth to an offspring. Which ONE of the following is correct with regard to the Red kangi species? A Internal fertilisation and viviparous B Internal fertilisation and ovoviviparous C External fertilisation and oviparous D External fertilisation and viviparous
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The process of cell division during metaphase I is crucial because it allows for the assortment of chromosomes, leading to genetic variation in the resulting gametes. During this stage, homologous pairs of chromosomes line up along the metaphase plate, preparing for separation. This is a fun reminder that even our chromosomes are social creatures, hanging out in pairs before they go their separate ways! In terms of the placenta, it serves as a life-support system for the developing fetus, ensuring that essential nutrients and oxygen are delivered while removing waste products. It's like a VIP pass for the fetus, giving it everything it needs to grow while using the mother's circulatory system. Talk about a special connection!
