monotremata

Question 1

exclusive characters of monotremes

Answer 1

rostrum covered in electroreceptors, reduced teeth with no teeth in adults, modified skull morphology, bill or beak like rostrum, no auditory bulla and simplified cochlea, ancestral shoulder girdle, mammalian pelvic girdle, epipubic bones

Question 2

monotreme chromosomes

Answer 2

5x and 5y

Question 3

eggs

Answer 3

thin leathery shell, hatch highly altricial young; layed through a cloaca

Question 4

thick bodies with short spines, slender beaklike rostrum with electroreceptors, long protrusible tongue, powerful limbs for digging, males have nonvenomous ankle spurs, insectivores, small eyes with poor eyesight, females have temporary pouch to carry young, solitary and crepuscular, live in burrows, good sense of smell, lay 1-2 eggs hatching in 9 days, young live in pouch for 12 weeks and weaned at 20 weeks

Answer 4

family tachyglossidae
echidnas and spiny anteaters

Question 5

semi aquatic with dense pelage and eye and ear openings covered by skin folds while underwater and webbed feet, males have venomous ankle spurs, gums covered in horny plates, flattened bill like rostrum with electroreceptors, live in rivers, streams and lakes, take refuge in burrows in the banks

Answer 5

family ornithorhynchidae
platypus - Ornithorhyncus anatinus