Flower color in snapdragons is an example of incomplete dominance. When a red-flowered plant is crossed with a white-flowered plant, the offspring have pink flowers. If a pink-flowered plant is crossed with another pink-flowered plant, their offspring will be:
a) 50% pink and 50% red.
b) 25% red, 50% pink, and 25% white.
c) 25% white and 75% red.
d) all white.
e) all pink.
Ans: b) 25% red, 50% pink, and 25% white.
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Place the events illustrating how genes and hormones interact in the development of behavior in the correct order
1. target neurons change intracellularly 2. hormones change genetic activity and enzymatic biochemistry in their target neurons 3. genes code for hormone production 4. animal’s behavior changes
a. 1, 2, 3, 4 b. 3, 2, 1, 4 c. 2, 3, 1, 4 d. 2, 1, 3, 4 e. 3, 1, 2, 4
Which of the following may occur in meiosis but not in mitosis?
A. DNA replication B. chromosome condensation C. metaphase D. cytokinesis E. crossing-over
Because of its larger size, the replication rate of eukaryotic genomes is significantly faster than the replication rate of bacterial and archaeal genomes.
Answer the following statement true (T) or false (F)
Which of the following statements about T-cells is NOT correct?
A) Lymphoid precursor cells migrate into thymus and mature into T-cells. B) TH Cells produce granzyme and perforin to lyse the target cells in the adaptive immune responses. C) More than 99% of T cells die in thymus during colony selection. D) T cells undergo both positive and negative selections during maturation. E) T cell receptors contain both variable domain and constant domain.