Correct answer to Tuesdays #MCAT question is C! See explanation and recommended Firecracker review below. Any questions? Ask and well answer! C) Histone modifications are can alter expression of genes in a way that is independent of the parent’s genetics. Epigenetics has recently been identified as justification for Lamark’s theories. Explanation of incorrect answers: A) DNA was later found to be responsible for genetic inheritance. During Mendel’s time this was unknown. Mendel hypothesized that traits were passed on as units. These were later found to be genes that are encoded by DNA. B) Chromosomes support Mendel’s theory that trait units segregate independently of each other. Mendel noticed that each characteristic he tracked would be passed on independently to the next generation. This is due to the fact that the traits are on different chromosomes that segregate independently during Meiosis. D) Meiosis provides a mechanism for several of Mendel’s observations. These include independent assortment and the fact that one copy of each genetic unit is inherited from each parent. **** Review these topics on Firecracker! Transcription regulation and DNA binding proteins: https://med.firecracker.me/topics/6053 Mitosis and Meiosis: https://med.firecracker.me/topics/7818
Posted on: Wed, 16 Jul 2014 14:45:09 +0000