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- Hermaphroditic animals can self-fertilize, except earthworms. Why? And is this an advantageous or disadvantageous trait to the earthworms?Which ovary is functional in birds?Why are sea urchins have external fertilization? What are the adaptive advantages of external fertilization? How about internal fertilization?
- A mammalian embryo puts the trophoblast into a hurried frenzy before it decides to proceed to the business of gastrulation. Is it a Clever move, or an evolutionary blunder? Explain wellFemale mammals undergo continuous reproductive cycles during their reproductive life. In the sense of offspring production, what is the benefit of these continuous cycles?What is the Effect of Castration on Nervous System of the Mammalian Male?
- Describe the gastrulation by using embryos of the sea star as an example.And describe the way in which the mass of inert yolk influences the gastrulation in bird and frog embryos.In mammals, distinguish and differentiate the following germinal layers. Identify the organs that will arise from each of them: 1. Endoderm 2. Mesoderm 3. EctodermHow do the two kinds of mammalian reproductive cycles— estrous and menstrual differ?
- In your own words: Expound how the mass of inert yolk influences gastrulation in amphibians, reptiles, and mammals.In terrestrial arthropods, fertilization is always internal (True/False)?Explain: Is the degenerating blastocoel visible in the frog gastrula? How much yolk protrudes through the blastopore of a frog gastrula How much yolk protrudes through the blastopore of a frog gastrula? Chickens lack a larval stage. How do they compensate for this?