In studies of human MZ and DZ twin pairs of the same sex who are
reared...
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Biology
In studies of human MZ and DZ twin pairs of the same sex who arereared together, the following concordance values are identifiedfor various traits. Based on the values shown, describe therelative importance of genes versus the influence of environmentalfactors for each trait.
Trait Concordance
MZ DZ
Blood type 100 65
Chicken pox 89 87
Manic depression 67 13
Schizophrenia 72 12
Diabetes 62 15
Cleft lip 51 6
Club foot 40 4
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Monozygotic twins or MZ are twins formed from a single zygote which splits to form two embryos They are phenotypically and genotypically similar but not exactly the same They have maximum genetic similarity Dizygotic twins are produced when two eggs in the ovary gets fertilized simultaneously by two sperms creating two zygotes which formes two embryos Dizygotic twins are nothing but normal siblings born together They do not have as much genetic similarity as MZ twins Concordance value indicates the
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