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20 Cards in this Set
- Front
- Back
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2 regions in DNA
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-coding
-regulatory |
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"interrupting" sequences of DNA
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introns
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coding regions of DNA
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exons
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type of RNA that carries the code for the protein master sequences from the DNA of the nucleus to the protein-synthesizing machinery in the cytoplasm
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mRNA (messenger RNA)
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type of RNA that provides the ribosome with the correct amino acids
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tRNA (transfer RNA)
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what can be used to block mutant RNA?
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RNA interference by small RNAs
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sperm have ? instead of histones
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protamines
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telomeres are ?
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guanine-rich repeat sequences on the ends of chromosomes
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special enzyme in embryos that repair the ends of chromosomes when cells divide
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telomerase
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new, replicated strands of DNA tend to segregate together in daughter cells - this is called?
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immortal strand hypothesis
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meiosis I/ meiosis II is "reduction division"
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meiosis I
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t/f, two sister chromatids (conjoined chromosomes) are tightly bound together and do NOT separate.
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true!!!
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spermatogensis forms ? sperm cells; oogenesis forms ? ova.
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4; 1
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small cells formed during oogenesis (3 that do not become the ova)
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polar bodies
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when does "crossing-over" occur between chromosomes in meiosis?
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prophase I
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haploid daughter cells are formed during?
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metaphase, anaphase, and telophase I
(at this point they are haploid double structures, which will become haploid single structures during meiosis II) |
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happens when homologous chomosomes or chromatids do not separate properly during meiosis I or II
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non-disjunction
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3 survivable trisomys
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13, 18, 21
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trisomy 21
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Down's syndrome
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XO
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Turner's syndrome
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