What are (a) and (b)? The mitotic division starts as the zygote moves through the isthmus of the oviduct called _______________ towards the uterus and forms 2, 4, 8, 16 daughter cells called __________________ .

Question

( a ) unfertilised ovum after ovulation and fertilisation ; cleavage, morula
( b ) unfertilised ovum after ovulation and fertilisation ; differentiation, morula
( c ) ovum and fertilisation ; cleavage, morula
( d ) unfertilised ovum after ovulation and fertilisation ; cleavage, blastomeres