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The father is heterogeneous pointed eyebrows Bb

Rh factor is a protein found in blood. A person with Rh factor in blood is called Rh positive whereas one who does not carry this protein in the blood is called Rh negative. Marriage should be avoided between Rh-negative females & Rh-positive males. This can be fatal for the mother as well as the baby of such parents. (second pregnancy may result in erythroblastosis fetalis if necessary precautions are not taken).

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Natural selection is the result of genetic variation, environmental pressures, and competition for resources. Genetic variation as a result of the following: Mutations: Create new genotypes Sexual reproduction: Increases genetic variation Heritable traits: Passed from parent to offspring

No expanded working has been attached for this question yet. The verified answer is Option D.

(a) Components of Blood: -(Blood) Plasma-Platelets(Thrombocytes) - White blood cells/Leucocytes - Red blood cells/erythrocytes. (b) Name or Component of Blood that: (i) forms top layer in the test tube: (Blood) Plasma. (ii) Destroys Pathogens: White Blood Cells/Leucocytes (iii) Is Biconcave in shape: Red Blood Cells/Erythrocytes (iv) Would be relatively low in a Haemophilic condition: Platelets(Thrombocytes) (v) is produced in the bone marrow: - platelets (thrombocytes); - white blood cells/Erythrocytes; - Red blood cells/leucocytes cells/erythrocytes. (vi) Is a Thrombocyte: Platelets (vii) Is Nucleated: White Blood Cells/Leucocytes. (c) Chemical Substances Transported by the Blood Component Named in 1(b)(i) Blood Plasma: -Thyroxine/Adrenaline/Insulin/Progesterone/Hormones. (Digested) food substances/Nutrients/Glucose Amino acids/Any correctly named digested food substances.-Antibodies/Antigens. -Oxygen/carbon(IV) oxide/dissolved gases.-Toxins -Mineral salts/salt /magnesium/copper/potassium/zinc -Urea/uric acid -Water -Vitamins (d) Diseases Associated with Blood: -Anaemia/Anemia -Hepatitis -Sickle cell anaemia leukemia Luekaemia/Blood cancer. (e) Reason a Disease that Attacks the Blood is Deadly: -The blood circulates throughout the body/it is a medium of transportation in the body.-It makes contact with major organs of the body and makes it easy for a disease to be deadly. -Blood disease could attack any component of blood and threatens life.

(a) Dentition In Animals: Is the type/shapes, number, and arrangement of teeth in the mouth/jaws of animals (b) Description of the Generalised Structure of a Tooth in Animals: -The tooth is made up of a crown. neck and root. -The visible part of the tooth in the crown. -And is covered by the hardest substances/enamel -The neck of the tooth is surrounded by the gum. -While the root is embedded in the jawbone. -Beneath the enamel is the hard dentine. -Which forms the bulk of the tooth in the pulp cavity. -Containing sensory endings of nerves/blood capillaries. -The cement/periodontal membrane covers the root of the tooth in the jawbone. (c) Food Substances that Plants Manufacture from Glucose:-Sucrose/maltose-Starch -Cellulose -Oil-Proteins (d) Diagram of an Experiment that Shows that Oxygen is Produced During Photosynthesis

(a) (b)(i) Products of Decomposition: Hydrogen sulphide;-Carbon(IV) oxide; -Methane; -Ammonia; -Water vapour/water;-Mineral salt/plant nutrients;-Heat/energy;-Humus. (ii) Roles of Decomposer on Refuse Dump:-They feed on dead/decaying organisms, -They form a link in a food chain; -They form a link between biotic and abiotic factors in ecosystem; materials; -They release inorganic components from organic materials; - they facilitate the recycling of nutrients in the ecosystem; -They reduce the bulky nature of the debris/dump. (c) Materials in a Refuse Dump that would not be Affected by the Action of Decomposers: -Plastics; -Metals/iron/tin/zinc/aluminium; -Glass/bottle -Nylon/polyethene; -Rubber/tyres,-Stones; Ceramics.

(a) (b) Effects of the Following Factors on the Conservation of Natural Resources: (i) Poor economy of a nation: It leads to lack of funding in creating awareness /educating people on the importance of conservation. It leads to increase in poaching/forest encroachment/over fishing/illegal mining by locals,-Jt leads to inability to execute/enforce policies/strategies; It leads to poor implementation/enforcement of laws-It leads to inability to setup forest/game reserves: -It leads to inability to employ guards-lt affects the feeding of animal species in game reserves: -It affects the habitat of species;-t affects the maintenance/acquisition of enough land for game reserves. (ii) Poaching:-Leads to the death of endangered species, -Leads to recduced population/extinction of species; -It affects tourism/economy of a nation; -lt disrupts the natural food chain: -Leads to spread of disease from wildlife animals to humans. (c) Roles Played by the Government in Conservation of Natural Resources: -Enactment/enforcement of laws for conservation:-Formulating policies against poaching/overgrazing/over fishing/for tree planting campaign/protecting soil from erosion. -Creating ranches to aviod overgrazing; -Training officials to guard game reserves/fish ponds; -Educating the general public on conservation of resources;-Setting up surveillance equipment for security officers in game reserves,-Setting up forest/game reserves/ Fish ponds; -Encouraging regeneration of endangered species.

No expanded working has been attached for this question yet. The verified answer is Option A.

No expanded working has been attached for this question yet. The verified answer is Option B.

No expanded working has been attached for this question yet. The verified answer is Option D.

No expanded working has been attached for this question yet. The verified answer is Option A.

(a) (b)(i) Irritability: This is the response/sensitivity to changes; to stimulus/stimuli; in the environment (ii) (c) Examples of Animals that Exhibit: (i) Territoriality: -Male fish/Tilapia, -Male Agama lizard/crocodile/lizard: -Birds;-Man, Dogs/ Monkeys/ Hippopotamus/apes/wolves/antelopes/baboons/lions.(ii) Seasonal migration: -Catfish/mudfish; -Swallow; -Wildebeest; -White egret; -White stock bird; -Salmon: -Desert locust;-Quelea;-Eel. (iii) Display: -Peacock; -Domestic fowl; -Pigeon;-Dove, -Penguins.

(a)(i) A: Neck region/neck B: Chest region/thoracic region/thorax C: Upper abdominal region/upper abdomen (ii)A: Supports the head/head region - protects blood vessels - protects spinal cord - passage for blood vessel - passage fpr spinal cord - provides surface for attachment of neck muscles. B: Provides point of attachment for chest muscles /articulates with rib bones - protects the/passage of spinal cord. C: Bears weight of the body - permits bending/sideways movement/rotation of the body - provides surface for attachment of muscles -protects the spinal cord/passage of spinal cord. (b)(i) (ii) Neural spine: for attachment of (abdominal and back ) muscles Transverse process: For muscle attachment Neural arch: For muscle attachment/protection of spinal cord Centrum: Provides (mechanical) support Neural canal: Encloses/Houses the spinal cord/passage for spinal cord. (C)(i) A: Cervical vertebra (7) B: Thoracic vertebra (12) C: Lumbar vertebra (5) (ii) Sacral/sacrum - caudal/coccyx