An egg with yolk in the center and cytoplasm surrounding it is known as:

What is the oestrous cycle?

Describe the location and function of the Bulbourethral gland and Corpus luteum.

$A$: Most birds possess only the left ovary and left oviduct for conveying the ovum released from the ovary.
$R$: The avian ovary does not form a corpus luteum from the ruptured ovarian follicle which undergoes rapid shrinkage.

Cleavage in the mammalian egg is $.........$.

Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?