: In birds, after 4–7 days of incubation, a fertilized egg will show dark veins and a small embryo when held up to a bright light (candling).
A (scientifically known as a zygote ) is the cell formed when a male's sperm joins with a female's egg , marking the beginning of an organism's development. Identification and Appearance fertilized egg
: In a freshly cracked chicken egg, a fertilized egg is identified by a small, white "bullseye" (blastoderm) on the yolk, rather than a solid white spot (blastodisc). : In birds, after 4–7 days of incubation,
Depending on the context (e.g., backyard chickens vs. human biology), the appearance of a fertilized egg varies: : In birds