COMPARISON OF REPRODUCTION IN VERTEBRATES
CONTENT
- Structural Differences in the Eggs of Vertebrates
- Comparison of Reproduction in Fish, Reptiles and Mammals
Structural Differences in the Eggs of Vertebrates
The fish eggs are very small and appear like mass of sand grains. The egg contains the young fish and is enclosed in and egg case or membrane. In amphibians- toad or frog, the eggs are small and spherical. An egg consists of semi liquid cytoplasm containing a nucleus surrounded by a tough black egg membrane. The toads egg is black on the under surface because the protoplasm of the egg is full of yolk granules abundant in the lower part of the eggs.
The egg has a thin coat which absorbs water and swells to form the jelly or albumen. This jelly protects the egg and separates them from one another in a bead-like manner.
In reptiles, e.g., Agama lizard. The egg is cream coloured. It has a soft but tough leathery shell. It absorbs water from the surrounding soil and increase in size or volume.
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ClassHall Instructor
Wilfred Bassey
Maryam
Zulaikha Momoh
Zainab Ahmadu