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7B Warm-Up Monday, March 2, 2009 #11 After a recent serious illness, Neh Neh had some blood work done. It was discovered that her T-cell or lymphocyte count was low. T-cells are the cells in blood that allow your immune system to fight off infection. In seven samples of blood there are 168 Tcells. This is after a total of 7 cells were removed for testing. How many T-cells were in each sample to start? a. 15 b. 25 c. 50 d. 65 Answer: 3/2/09 B. 25 7x – 7 = 168 7B Warm-Up Tuesday, March 3, 2009 #12 “Stronger” traits are called_____________. “Weaker” traits are called _____________. Geneticists use _________ to represent the different forms of a gene. Answer: 3/3/09 DOMINANT recessive letters R R r Rr Rr r Rr Rr 7B Warm-Up Wednesday, March 4, 2009 #13 DNA is made of subunits called _____________. Answer: 3/4/09 nucleotides 7B Warm-Up Thursday, March 5, 2009 #14 Nucleotides are identical except for the base. Name the 4 bases. 1. 2. 3. 4 Answer: 3/5/09 1. 2. 3. 4. Adenine Thymine Guanine Cytosine 7B Warm-Up Thursday, March 6, 2009 #15 Which of the following best describes the structure of DNA? A. DNA has two strands that form a branched chain called a branched helix. B. DNA is in the shape of a twisted ladder called a double helix. C. DNA is in the shape of a straight ladder called a straight helix. D. DNA has three strands that form a triple helix. Answer: 3/6/09 B.DNA is in the shape of a twisted ladder called a double helix.