Is there a realtime molecular clock within the genome to co-ordinate the developmental sequences in an embryo?
It is difficult to assume that the massive number of co-ordinated developmental sequences in a developing embryo is controlled by molecular signalling alone. Is anyone aware of a molecular or ...
If cytoplasmic determinants are distributed before fertilisation then how can an amphibian's embryo, whose dorsal side is determined after fertilisation develop ?
Someone told me that primitive lymph nodes do not exist during this week. However, others say they can. Here is a picture about inguinal lymph nodes from here. No primary lymph nodes are visible ...
I am not completely sure where there are cartilage in the eye. I think the developing vitreous body (very light coloured) does not have cartilage. You can assume the eye is during the weeks 11-13 of ...