In the absence of recombination, how many genetically different types of gamete can an organism with five homologous chromosome pairs produce?
(a) 5
(b) 10
(c) 32
(d) 64
(c) Because homologous chromosomes assort randomly at meiosis and a gamete has two choices for each chromosome (because sexual organisms are diploid), there are 25, or 32, possible genetically different gametes.
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An atom has 20 electrons and 20 neutrons. What is the mass of this atom?
A. 10 B. 20 C. 40 D. 80
Which of the following statements is NOT TRUE about sister chromatids?
a. Sister chromatids separate from one another during prometaphase b. Two sister chromatids make up one chromosome c. Sister chromatids are generated during S phase d. Sister chromatids are physically attached by the centromere e. Sister chromatids normally end up in separate daughter cells
Cladistic analysis of populations of blue wildebeest in Africa has helped to show that habitat fragmentation has led to a loss of ____.
A. evolution B. alleles C. genes D. gene flow E. mutations
Which step of cellular respiration is responsible for making the most ATP molecules?