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Transcript
If a mom and dad both have a recessive trait in their DNA, what is the chance that they BOTH pass it on to one offspring? • Lab #23 The modern study of genes in all living things. • Studying what genes do • Studying how genes interact • Studying how genes change Each is a set of nucleic acids (nucleotide bases) that code for a protein to be made. Genes code for skin pigments, eye and hair color, and many other things. A segment of DNA Actually made up of different combinations of 4 letters- A, T, C, G A pairs with T C pairs with G T A A C G T A A C A T T G C A T T G T A A C G T A A C A T T G C A T T G • Strands of letters tell the ribosome what protein to make and how to make it. • *since you have two copies of each gene (one from mom, one from dad, they do not always agree. • They interact in many different ways. Dominance• Genes that will always show if they are present. (CAPITAL) Recessive• Both chromosomes must have these genes for them to show. (lower case) Blue Eyes vs. Brown Eyes • Brown eyes is a dominant color. If EITHER of your chromosomes hold the genes for brown eyes, you will have brown eyes. • Blue eyes are recessive, so you can only have blue eyes if both of your chromosomes hold the gene for blue eyes. Tay-Sachs Disease• Your cells have protein that breaks down fat in your body. • In Tay-Sachs, that protein is not made, so fats build up in the brain and cause brain function stop, leading to death at a young age. How do you inherit something from your grandmother? • Some traits disappear in one generation, but reappear later. • This is because a recessive trait can be in your genes but not show itself due to a dominant gene. • Sexual vs. Asexual Reproduction • Asexual- making an identical copy of an individual (has the SAME DNA) • Sexual- combines DNA of 2 parents, offspring has half of each parent Why do recessive traits keep getting passed down if they are harmful? • Lab #23
