_____ Which of the following is the meaning of the chromosome theory of inherita
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_____ Which of the following is the meaning of the chromosome theory of inheritance as expressed in the early 20th century? A) Individuals inherit particular chromosomes attached to genes. B) Mendelian genes are at specific loci on the chromosome and in turn segregate during meiosis. C) Homologous chromosomes give rise to some genes and crossover chromosomes to other genes. D) No more than a single pair of chromosomes can he found in a healthy normal cell. E) Natural selection acts on certain chromosome arrays rather than on genes. _____ At a specific area of a chromosome, the sequence of nucleotides below Is present where the chain opens to form a replication fork: 3'CCT A G G C J C C A A T C C 5' An RNA primer is formed starling at the underlined T(T) of the template. Which of the following represents the primer sequence? A) 5' G C C T A G G 3' B) 3' G C C T A G G 5' C) 5' A C G T T A G G 3' D) 5' A C G U U A G G 3' E) 5' G C C U A G G 3' _____ A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 16 picograms of DNA per nucleus. How many picograms would be found at that nucleus if it enter G_0, how much if it enter back into G1 and was stopped at the end of S? A) 8; 16 B) 16; 16 C) 16; 8 D) 16; 32 E) 32; 16 _____ An egg has completed meiosis II and has X picograms of DNA within the nucleus. when that egg get fertilize by a sperm cells of the same species and the zygote would how many picograms in that nucleus; when that cell enter in interphase and is stopped at the end of G2 how many picogrants in that nucleus? A) 8; 16 B) 16; 16 C) 16; 8 D) 16;32 E) 32;16 _____ Why do chromosomes coil during mitosis? A) to increase their potential energy B) to allow the chromosomes to move without becoming entangled and breaking C) to allow the chromosomes to fit within the nuclear envelope D) to allow the sister chromatids to remain attached E) to provide for the structure of the centromere _____ A woman is found to have 47 chromosomes, including three X chromosomes. Which of the following describes her expected phenotype? A) masculine characteristics such as facial hair B) enlarged genital structures C) excessive emotional instability D) normal female E) sterile femaleExplanation / Answer
19. ANS: B. Mendelian genes are at specific loci on the chromosome and in turn segregate during meiosis.
20. ANS: D. 5' A C G U U A G G 3'
21. ANS: D. 16: 32
22. ANS: B. 16: 16
23. ANS: B. To allow the chromosomes to move without becoming entangled and breaking
24. ANS: D. Normal female
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