The genealogy of twins is a widely popular subject of interest. Once it is emitted from the smokestacks of coal-fired power plants, among other sources, the gas can drift through the atmosphere for up to a year before settling into oceans and lakes. Contrary to public opinion, the likelihood of having twins does not skip a generation. Another way to detect a twin pregnancy is through Doppler; when two separate heartbeats are heard. And consistently, the microbe responsible for the disease, Mycobacterium tuberculosis, has been fighting back. If the twins have the same blood group then they are more likely to be identical.
However, non-identical twins can run in families.
Do twins run in families?
Do twins run in families? Age at which women experience their first period is linked to their sons' age at puberty. Read the answers to more questions about pregnancy. In the second tree B the grandfather is ff, so all his children are female, they have the ff combination of alleles because their father and mother were both ff. Non-identical twins Non-identical twins happen when 2 eggs are fertilised by 2 sperm at the same time. Identical twins are a completely different story.