Can Deuterostomes have twins?
One interesting difference between these two lineages is that identical twins are only possible in the deuterostomes. Their fertilized eggs keep the ability to develop into many tissues through several cell divisions, whereas the protostome cells specialize early. … The protostome embryos die if they are divided in half.
What animal is most likely to have twins?
Sheep, goats, and deer all regularly give birth to fraternal twins, Long said. But what about identical twins? These genetically identical siblings form when a single fertilized egg splits in two.
What type of cleavage produces identical twins?
Indeterminate cleavage is cleavage that results in in cells that maintain the ability to develop into a complete organism. IDENTICAL TWINS result from indeterminate cleavage.
Is a snail a Protostome?
Protostomia, group of animals—including the arthropods (e.g., insects, crabs), mollusks (clams, snails), annelid worms, and some other groups—classified together largely on the basis of embryological development.
Can cows have twins?
“It is estimated that about 2% of beef cattle pregnancies result in twins,” said veterinarian Bob Larson. He explained that twins are the result of either a double ovulation by the cow or an embryo that splits very early in development.
Can one identical twin have schizophrenia?
Why? Because identical twins share the exact same DNA. The twin studies showed that if one identical twin has schizophrenia, then there is a 30-50% chance that the other twin will have it as well. If a fraternal twin has schizophrenia, then there is a 15% chance that the other twin will have it as well.