The skin is an organ that turns over rapidly: dead cells are constantly being shed and replaced by new ones. Which of these factors help ensure that the new cells have the same identity as the old cells? O When cells differentiate they only maintain the DNA of lineage-specific genes, so these genes are transmitted to the daughter cells Cells in all tissues have the same epigenetic marks Epigenetic marks are completely erased when the parent cell undergoes mitosis but are rapidly re-established in the daughter cells Epigenetic marks are maintained through mitosis so daughter cells express the same genes as the narental cells

The skin is an organ that turns over rapidly: dead cells are constantly being shed and replaced by new ones. Which of these factors help ensure that the new cells have the same identity as the old cells? O When cells differentiate they only maintain the DNA of lineage-specific genes, so these genes are transmitted to the daughter cells Cells in all tissues have the same epigenetic marks Epigenetic marks are completely erased when the parent cell undergoes mitosis but are rapidly re-established in the daughter cells Epigenetic marks are maintained through mitosis so daughter cells express the same genes as the narental cells

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter10: Control Of Gene Expression

Section: Chapter Questions

Problem 2DAA

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. Neurofibromas are tumors of the skin that can arisewhen a skin cell that is originally NF1+/ NF1− losesthe NF1+ allele. This wild-type allele encodes a functional protein (called a tumor suppressor), while theNF1− allele encodes a nonfunctional protein.A patient of genotype NF1+ / NF1− has 20 independent tumors in different areas of the skin. Samplesare taken of normal, noncancerous cells from thispatient, as well as of cells from each of the 20 tumors.Extracts of these samples are analyzed by a techniquecalled gel electrophoresis that can detect variantforms of four different proteins (A, B, C, and D) allencoded by genes that lie on the same autosome asNF1. Each protein has a slow (S) and a fast (F) formthat are encoded by different alleles (for example, ASand AF). In the extract of normal tissue, slow and fastvariants of all four proteins are found. In the extractsof the tumors, 12 had only the fast variants of proteinsA and D but both the fast and slow variants of proteins B and…
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