No
Eye colour is caused by genetics whereas the weight of a person depends on how they life their life (how healthily they eat or how much exercise they do) so it is an environmental variation. Identical twins have the same genes so have the same eye colour.
Yes. Conjoined twins are always identical (monozygotic) twins, and identical twins are always the same sex.There is a theoretical case where identical twins could be opposite genders, when the babies are female but in one of the females, a branch of one X chromosome breaks away; however, I don't believe this has ever been observed.
Homozygous means "the same egg." That refers to identical twins. Identical twins are always the same gender since they have the same chromosomes.
Estimating the exact number of pairs of identical twins in the world is challenging due to varying birth rates and reporting practices across countries. However, studies suggest that approximately 3 to 4 pairs of identical twins are born for every 1,000 births globally. Given the world's population and average birth rates, this could translate to millions of pairs of identical twins existing today. The prevalence of identical twins can also vary by region and population genetics.
no, sometimes one is taller
No, identical twins do not always share a placenta. In some cases, identical twins may have separate placentas.
Eye colour is caused by genetics whereas the weight of a person depends on how they life their life (how healthily they eat or how much exercise they do) so it is an environmental variation. Identical twins have the same genes so have the same eye colour.
Yes. Conjoined twins are always identical (monozygotic) twins, and identical twins are always the same sex.There is a theoretical case where identical twins could be opposite genders, when the babies are female but in one of the females, a branch of one X chromosome breaks away; however, I don't believe this has ever been observed.
Fraternal twins are two siblings that have the same birth day, but do not look identical.
Identical twins can share the same placenta during pregnancy, but it is not always the case. In some instances, identical twins may have separate placentas.
Women who are themselves fraternal twins have a 10% chance of producing twins, identical twin women have only a 0.6% probability of having a twin birth.
Twins don't always think alike, whether they be identical, fraternal, or even simese. It depends on there personalities, not their looks.
Homozygous means "the same egg." That refers to identical twins. Identical twins are always the same gender since they have the same chromosomes.
fraternal twins have two different chromosomes
Identical twins (monozygotic) occur when a single egg, fertilized by a single sperm, splits into two identical halves. Two separate babies with identical DNA are formed. Identical twins are always the same sex and blood type. http://www.twin-pregnancy-and-beyond.com/identical-twins-or-fraternal-twins.html
fraternal twins have two different chromosomes
fraternal twins can have separate fathers.