How to Explain Phenotype Differences in Identical Twins

But it can also be traced to. Human monozygotic twins and other genetically identical organisms are almost always strikingly similar in appearance yet they are often discordant for.

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B Identical genes means that they will develop identically in an identical environment.

. 9 here at the American Society of Human Genetics meeting may partly. Image by Lorilee Alanna via Pixabay. They would have the same genotypes such as hair color and predisposition to heart disease.

Like one have a mole and the othe not having oneis it because of alles. A boy has XY chromosomes and a girl has XX chromosomes. SAN FRANCISCO Identical twins may not be so identical after all.

Part A How can you explain this. After all as identical twins the pair have exactly the same genes. 1if identical twins have the same genes then how come identitcal twins still exhibit phenotype differences.

Identical twins have perfect resemblance to each other. They may have different lifestyles exercise smoking drinking nutrition job stress etc. The degree of phenotypic difference may vary.

Identical twins are another example of genotype vs phenotype. The twins may have had different childhood illnesses as they grew up. Identical twins come from a single fertilized egg that has split into two.

However fraternal twins do not resemble each other. We may be identical twins but we are very different in many ways Such a divergence might seem odd. Parents of identical twins know differently however.

The reasons why identical twins have differences at allnot just in health outcomes but temperament taste and physical traitscan come down to random chance. Identical twins are always of the same sex whereas fraternal twins can be of the same sex or a mix of male and female twins. These small differences in software can lead to identicals having differences in appearance behavior and medical histories.

Monozygotic or identical twins sometimes display phenotypic differences which can be attributed to intrauterine environmental factors. However this is only an example of how nature can influence behaviour that is partly genetically determined such as behaviours linked with personality predisposition to be more aggressive due to candidate genes. As identical monozygotic twins share 100 of the same genetic material we can say that their genotype is identical.

In contrast fraternal or dizygotic twins result from the fertilization of two separate eggs during the same pregnancy. Epigenetic mechanisms may explain paradoxical findings in twin and inbred animal studies when phenotypic differences occur in the absence of observable environmental differences and also when environmental differences do not significantly increase the degree of phenotypic variation. The findings presented Friday Nov.

They share half of their genes just like any other siblings. Identical twins share all of their genes and are always of the same sex. Identical twins each carry the same genome but over time can develop different phenotypes.

O The environmental exposures lead to differences in their epigenome and therefore differences in gene expression. Identical or monozygotic twins may or may not share the same amniotic sac depending on how early the single fertilized egg divides into 2. Despite their shared genetic.

But actually twins who start out with identical DNA always have slightly different DNA by the time theyre born. Even though identical twins supposedly share all of their DNA they acquire hundreds of genetic changes early in development that could set them on different paths according to new research. Originally posted by Evil.

This uniqueness is a result of the interaction between our genetic make-up inherited from our parents and environmental influences from the moment we are conceived. And they also each use their DNA a bit differently too. For example their fingerprints would be different.

O The differences in reparative complexes lead to differences. Such phenotypic differences touch on a variety of traits from physical attributes such as facial features to complex behaviors and even diseases Wong Gottesman Petronis 2005. If twins are a boy and a girl clearly they are fraternal twins as they do not have the same DNA.

Identical twins are similar in their chromosomal make up whereas the fraternal twins differ in their chromosomal make up. The stereotype of identical twins is that they are exactly the same. But they could have different phenotypes.

-Although science cannot explain the cause of differences in internal characters between identical twins extreme differences between children and their parents ie very very far from the tree those differences can be explained by rebirth concept. 100 18 ratings Transcribed image text. As twins grow and develop their DNA hardware stays the same but through different life experiences twins can develop a different epigenome software that controls the the DNA hardware.

Rates of disease discordance in MZ twins are usually well over 50 even for highly heritable disease suggesting that epigenetics can contribute significantly to MZ twin phenotype discordance. As identical twins get older they may look more and more different because they. Even though this is true for all identical twins we cant usually tell because the changes happen in parts of the DNA that dont affect how identical twins look.

Fraternal twins can be of the same or different sexes. They are clones of each other. We are all unique.

They look alike they dress in matching outfits they share the same likes and dislikes. Discordant MZ twins have been identified in a number of. Out of 381 pairs of identical twins involved in the new study 39 had more than 100 differences in their DNA.

Even monozygotic twins who are genetically identical always have some variation in the way they look and act. If these twins were separated at birth and were. Phenotype differences between MZ twins reared apart are not significantly higher than between MZ twins reared together.

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