BIOA01H3 Lecture 22: Lec 22 - l1
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BIOA01H3 Full Course Notes
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D, tall parent have even taller offspring and short parents have even shorter offspring, creating divergence. This line is expected when all variation is due to genotype. Galto(cid:374)"s result shows what happens when variation is due to genotype and environment. The offspring mean shows regression from the parental mean toward the population mean. Slope of 0. 0 is just determined by the environment. Means to separate the effects of genotype and environment on phenotype. Identical twins (monozygotic twins) arise from a single fertilized egg. Fraternal twins (dizygotic twins) result when two separate eggs, produced by double ovulation are fertilized by two different sperm. Genotypes related; similar to a pair of siblings. Similar concordance rates for identical and fraternal twins genotype less important. Concordance is the probability for one twin to have a trait and the other one also having the trait. In identical twins the concordance level is much higher tan in fraternal twins.
