Complete Table 6.1 by using the flow diagram to name the cell, the organ and the processes shown in Fig. 6.1.
State why sperm and egg cells need to be haploid instead of diploid.
State the role of the jelly coat around egg cells.
Complete the sentences with the correct words. The placenta offers a large surface area for the [BLANK] of oxygen and carbon dioxide between maternal and fetal blood. Dissolved nutrients also cross the placenta. Examples of dissolved nutrients include: [BLANK] acids, [BLANK] and [BLANK]. Antibodies pass from the maternal blood, giving the baby natural [BLANK] immunity against some infections that the mother has already had or has been vaccinated against. Each type of vaccine contains one or more [BLANK] obtained from the [BLANK] that causes the disease.