Important Questions on Human Reproduction The fifth cleavage of the fertilized egg of frog results in the formation of In human beings, the hollow ball of cells called a , about b days after fertilisation, burrows into the lining of uterus event called implantation. Blanks a, b respectively are Morula is formed by _____ of the fertilized ovum. (cleavage/ gastrulation) The ratio of the nucleus to cytoplasm at the beginning of cleavage is Which cell division is found during cleavage? A change in the amount of yolk and its distribution in the egg will not affect The cleavage in which incomplete division of egg occurs is known as Embryonic membranes are formed from a layer of cells called _____ of blastula. When cleavage furrow bisects both the poles of the egg passing through the animal-vegetal axis, the plane of cleavage is called? Zygote divides to form _____ which is implanted in endometrium. (Blastocyst/ Gastrula) Cleavage was first observed by- The extra embryonic membranes of the mammalian embryo are derived from At which stages the implantation in uterus takes place? Which of the following is cleavage in bird's egg? The type of division takes place during zygote cleavage is _____ Morula is a developmental stage between two of the following: In mammals, the zygote divides to form _____, which is implanted in the uterus. The number of cells present in the morula stage is _____. (Write it numerically) The blastula precedes the formation of the _____ in which the germ layers of the embryo form. In teleosts, reptiles and birds the cleavage pattern is 
