continue (c,d) from question No. 2 and 3. (a, c) loboratory Report 37. Evolution

Question

continue (c,d) from question No. 2 and

3. (a, c)

loboratory Report 37. Evolution c. How do you explain the pharyngeal pouches in chick and pig embryos? 483 dDoes the presence of pharyngeal pouches in all vertebrate early cmbryos support the theory of descent from a common ancestor? Explain. 3. EVIDENCE FROM VERTEBRATE ANATOMY a. Compare specializations of the forelimbs by completing the table below: Vertebrate Describe the forelimb Specializations indicate modification from a common vertebrate plan? b. Do other features of the skeletons examined Explain. c. Whales (mammals) possess a rudimentary (vestigial) pelvic girdle and limb bones. How do you explain this? Great apes and humans possess a coccyx, a rudimentary tail bone. How do you explain this? Does evolution of a body part produce the single best structural design or a functional modification of the basic structure available? Give two examples to illustrate your response. d. Birds and bats illustrate two different wing designs. Are these the only designs possible?

Explanation / Answer

Answer:

2c) how do you explain the pharyngeal pouches in chick and pig embryos?

2e) Does the presence of pharyngeal pouches in all vertebrate early embryos support the theory of descent from a common ancestor? Explain

Tortoise have long forelimbs that are used for digging burrows.

3c) Whale (mammals) possess a rudimentary (vestigial) pelvic girdle and limb bones. How do you explain this?

Vertebrate Describe the Forelimb Specialization Rabbit Each forelimb is divisible into a proximal upper arm (brachium), middle forearm (antebrachium) and distal hand
(manus). Claws of forelimbs helps in digging the burrows Pigeon Two Forelimbs are modified as wings. Each wing remains attached high on the antero-dorsal side of the trunk. Each wing is elongated, flattened and distally pointed with its longitudinal axis at right angles to that of the trunk Tortoise

Tortoise have long forelimbs that are used for digging burrows.

Toad The forelimb of toad is formed by a combination of some small and large bones. Humerus, Radia-ulna, Carpal, Metacarpal and Phalanges Fish In fish, fins are flapper like

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