Which cell organelle is responsible for producing the color of human skin?
a. Chloroplast
b. Melanosomes
c. Mitochondria
d. Melanin
e. Nucleus
b
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Suppose that in studies of genes on the same chromosome you find the following recombination frequencies:Figure
13.1 In this case, it would be proper to say that a, c, and b are ____.
a. linked genes b. different alleles of the same gene c. a trisomy resulting from nondisjunction d. linked genes that are not physically possible since the recombination frequencies do not add up e. three inverted genes
One source of trait variations among individuals is the process of fertilization, in which when new combinations of maternal and paternal alleles are produced. What other sources contribute to trait variations within a species?
What will be an ideal response?
Division of the cytoplasm in animal cells begins _____
a. as microtubules assemble at each pole of the nucleus b. as Golgi body vesicles are guided by microtubules to the center of the cell c. during S phase d. as rigid phospholipid bilayer is synthesized in between the dividing cells e. as a cleavage furrow is created by microfilaments in the cell's midsection
Patients with an abnormally long chromosome 9 have ____
a. the Philadelphia chromosome b. a rare form of eye development c. hemophilia d. Down’s syndrome e. a deletion mutation