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How many gametes are need for non-identical twins?

To have twins, it's just two. whether they're identical or not depends on if they're two girls, two boys, or one boy and one girl. To have twins, it's just two. whether they're identical or not depends on if they're two girls, two boys, or one boy and one girl.


How many different kid of twins are there?

there are two types of twins-- fraternal and identical. Fraternal twins are genetically unique, and they usually have physical differences. Identical twins are identically identical, such as a clone, and have exact physcial characteristics, excluding weight and scars etc.


How many varieties of twins are there?

fraternal and identical


How many zygotes are used to form identical twins?

Identical twins develop from a single zygote that splits into two embryos during early development. Therefore, only one zygote is needed to form identical twins.


How many egg cells are used with twins?

It depends on the type of twins If It was identical (monozygotic) twins, one egg is fertilized (As you can see, identical twins have similarity in phenotype (the observable characteristic of an organism) because of development of one zygote divided into two embryos) but if it was non-identical twins, two eggs or more (such as triplets or quadruplets) are fertilized. The twins have differences in phenotype


How many identical twins were born each year in the UK?

3 identical twins and 55million non-identical....hope it will help


How many sets of identical twins were born in 2007?

1000


How many eggs and how many sperm are there in fraternal twins?

11 sperms and 21 eggs


How do twins look exactly alike?

They do look different! Even identical twins, with identical DNA, are different. Most have a slight difference in height and weight. Many people have a difficult time telling them apart because they are focusing on the wrong things. If someone looks only at the hair, they may not see that their faces are slightly different.


What is one way in which identical and fraternal similar?

Identical and fraternal twins typically share many similar characteristics


Why does identical twins not have the same weight and Skin colour?

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.


How many pairs of twins your there in the world?

10 million identical and 115 nonidentical.