14 1 point In almost all organisms that have been studied, the genes in Hox clusters: each contain a unique homeodomain, the products of which are very different among organisms. are expressed in a sequence that is independent of their linear organization along the chromosome. are arranged on chromosomes in the same order as their products function along the anterior-posterior segments of the embryo. None of these choices are correct. are arranged on the chromosomes in a sequence that is independent of the order in which their products function along the anterior-posterior axis of the embryo.
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Step 1: Hox genes are known to play a crucial role in the development of the anterior-posterior axis in organisms. Show more…
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1. Which of the following is a characteristic of somatic cells? They only comprise the gametes. They only comprise a few specialized tissues in the body but contain a complete copy of all of an organism’s DNA. Each includes a nucleus at some stage of their development and contains a complete copy of all of an organism’s DNA. Each contains half a copy of an organism’s DNA. 2. What does meiosis produce? two gametes identical somatic cells a single gamete four gametes 3. How do Hox genes appear to function? They control the development of language in humans. They function only in fruit flies They regulate the arrangement of tissues and organs in complex organisms, from fruit flies to humans. They control which amino acids get plugged into polypeptide chains 4. How does RNA differ from DNA? RNA uses guanine instead of uracil. RNA uses uracil instead of adenine. RNA uses uracil instead of guanine. RNA uses uracil instead of thymine. 5. Why is nuclear DNA important for protein synthesis? It provides the code to produce tRNA. It forms sequences that are templates for production of proteins or parts of proteins. It transfers information from RNA to proteins. It serves as a template to which amino acids are attached in protein production. 6. Transcription occurs in the ________ and results in the ________ . ribosome; production of tRNA ribosome; transformation of mitochondria nucleus; production of mRNA nucleus; production of proteins
Imaan A.
11) The random alignment of homologous chromosome pairs during metaphase I of meiosis that contributes to the variation in gametes documented by Mendel's dihybrid crosses is the basis of Mendel's principle of a. Segregation b. Independent assortment c. Gene function d. Chromosomal inheritance 12) Given what you know about the structure of DNA, which of the following nucleic acid sequences would base pair with 5'-ATCGG-3' a. 5'-ATCGG-3' b. 5'-AUCGG-3' c. 5'-CCGAT-3' d. 5'-GGCTA-3' 13) Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the progeny from Bbtt x BBtt will be expected to have black fur and short tails? a. 1/16 b. 9/16 c. 3/16 d. 1/2 e. 0 14) Which of the following is different between Replication and Transcription? a. Replication uses DNA as a template and Transcription uses RNA as a template b. Replication copies information on both strands of a DNA double helix and Transcription copies information on one. c. Replication occurs in the nucleus and Transcription occurs in the cytoplasm d. None of the above. 15) Which of the following molecules contains an anticodon? a. rRNA b. mRNA c. tRNA d. DNA 16) Prokaryotic chromosomes differ from eukaryotic chromosomes because __________. a. Prokaryotes don't have chromosomes b. Prokaryotes have single stranded DNA chromosomes and eukaryotes have double stranded DNA chromosomes. c. Prokaryotes have RNA chromosomes and eukaryotes have DNA chromosomes. d. Prokaryotes have a single circular chromosome and eukaryotes have many
Sri K.
Mobile pieces of DNA-transposable elements $-$ that insert themselves into chromosomes and accumulate during evolution make up more than $40 \%$ of the human genome. Transposable elements of four types-long interspersed nuclear elements (LINEs), short interspersed nuclear elements (SINEs), long terminal repeat (LTR) retrotransposons, and DNA transposons-are inserted more-or-less randomly throughout the human genome. These elements are conspicuously rare at the four homeobox gene clusters, $H o x A, H o x B, H o x C,$ and $H o x D,$ as illustrated for $H o x D$ in Figure $Q 4-4,$ along with an equivalent region of chromosome $22,$ which lacks a Hox cluster. Each Hox cluster is about $100 \mathrm{kb}$ in length and contains 9 to 11 genes, whose differential expression along the anteroposterior axis of the developing embryo establishes the basic body plan for humans (and for other animals). Why do you suppose that transposable elements are so rare in the Hox clusters?
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