1. Explain one of the physical differences between Maria and Lucy. a. Pick one trait to explain (ex: hair texture, eye color, skin color)
b. Explain how these biological twin sisters inherited that difference in traits.
Word Bank: meiosis, sperm, egg, zygote, genes or chromosomes or DNA

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed