True or False. Explain your answer for each statement. 1. Histone proteins are n

Question

True or False. Explain your answer for each statement.

1. Histone proteins are necessary for packaging of DNA into euchromatin and heterochromatin. Additional histone proteins are recruited to the chromosomes during cell division to facilitate the condensation of the sister chromatids.

2. Some racerunner lizards in the western U.S. are all female. An offspring is genetically identical to its mother. They are produced by the process of cloning, in which the mother’s reproductive cells are activated to form a zygote and develop into a new individual.

3 .A scientist transfers a unique Hox gene that is expressed in the trunk of elephants to a mouse, and inserts it into the mouse’s Hox gene cluster in the same arrangement as in the elephant. It is possible for the mouse to develop a trunk-like appendage during its embryonic development.

Explanation / Answer

1.Histones are highly alkaline proteins found in eukaryotic cell nuclei that package and order the DNA into structural units called nucleosomes. They are the chief protein components of chromatin, acting as spools around which DNA winds, and playing a role in gene regulation. Histones are modified by acetlylation or methylation rather that Addition histone proteins and their recruitment to the chromosomes during cell division to facilitate the condensation of the sister chromatids. So FALSE

2. Based on this article, “No Sex Needed: All-Female Lizard Species Cross Their Chromosomes to Make Babies” by (Katherine, 2010) in Scientific American, the southwestern lizards' asexual reproduction is no longer a secret. Hence 2. Some racerunner lizards in the western U.S. are all female. An offspring is genetically identical to its mother. They are produced by the process of cloning, in which the mother’s reproductive cells are activated to form a zygote and develop into a new individual, is TRUE

3 .A scientist transfers a unique Hox gene that is expressed in the trunk of elephants to a mouse, and inserts it into the mouse’s Hox gene cluster in the same arrangement as in the elephant. It is possible for the mouse to develop a trunk-like appendage during its embryonic development.

It is possible for the mouse to develop a trunk-like appendage during its embryonic development, if after the genetic engineering i.e. the insertion of the mouse’s Hox gene cluster in the same arrangement as in the elephant in mouse provided the gene is expression after insertion, so TRUE

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