What is the map distance between the genes for flower color and fruit shape?
Assume that in watermelon plants the genes for flower color (Y = yellow; y = orange flowers) and fruit shape (R = round; r = oval) are on the same chromosome. You cross two true-breeding plants, one with yellow flowers and round fruit and the other with orange flowers and oval fruit. You take one of the F1 individuals and cross it with a plant that is homozygous recessive for both traits. You get the following in the F2: 300 yellow flowers, round fruit; 300 orange flowers, oval fruit; 100 yellow flowers, oval fruit, 100 orange flowers, round fruit.
A. 25.0
B. 4.0
C. 40.0
D. 33.0
E. 100.0
A. 25.0
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An unmutated version of an oncogene in a normal cell is called a ____
a. growth-inhibiting factor gene b. driver gene c. proto-oncogene d. pre-oncogene e. tumor suppressor gene
Diffusion of respiratory gases is enhanced by ____
a. a large surface area b. a thick epithelial layer c. cool temperatures d. the presence of active transport pumps e. the presence of carbon dioxide
A biologist isolates numerous tiny, green pigment cells from a sample of lake water. The cells are covered with a mucilaginous sheath. They contain relatively large amounts of chlorophyll a and phycobilin pigments and lack a compact, organized nucleus. Electron microscopy will reveal that these cells are also contain which of the following pairs of subcellular structures?
A. Ribosomes and chloroplasts B. Ribosomes and mitochondria C. Golgi bodies and a cell wall D. Thylakoids and a cell wall E. Chloroplasts and mitochondria
amino acids that cannot be produced by the body are called ___ amino acids
Fill in the blank(s) with the appropriate word(s).