Part A - Modification of chromatin structure Which statements about the modification of chromatin structure in eukaryotes are tr
ue? Select all that apply. View Available Hint(s) Select all that apply. Some forms of chromatin modification can be passed on to future generations of cells. Deacetylation of histone tails in chromatin loosens the association between nucleosomes and DNA. Acetylation of histone tails in chromatin allows access to DNA for transcription. DNA is not transcribed when chromatin is packaged tightly in a condensed form. Methylation of histone tails in chromatin can promote condensation of the chromatin. Acetylation of histone tails is a reversible process.
Some forms of chromatin modification can be passed on to future generation of cells
Acetylation of histone tails in chromatin allows access to DNA for transcription
DNA is not transcribed when packaged tightly in a condensed form
methylation of histone tails can promote condensation of the chromatin
Explanation:
chromatin modifications that can be passed on includes epigenetic modifications that are heritable changes made to the chromatin structure that does not involve the DNA sequences. Some epigenetic modifications include DNA methylation and Histone modifications. examples of histone modification include acetylation, methylation, phosphorylation, ubiquintylation etc. All these function either in allowing the DNA become more accessible to transcritional factors or vice versa. for exmple, histone tail acetylation encourages unwounding of nucleosomes allowing transcriptional factors to have access to the DNa while histone tails methylation further tightens the nucleosomes promoting condensation of the chromatin.
Fur colour can be represented by both the dominant and the recessive alleles of the gene encoding the fur color.
Explanation:
Considering that the fur colour trait follows Mendelian laws of inheritance.
The dominant allele can express itself in both the homozygous and heterozygous condition.
The recessive allele can represent itself only in the homozygous condition.
Therefore, there will be two phenotypes, one will be represented by both the homozygous dominant and heterozygous dominant genotypes and the other represented by the homozygous recessive genotype.
Considering that the fur colour trait does not follows Mendelian laws of inheritance (Incomplete Dominance or Codominance).
In Incomplete dominance, three phenotypes are observed, for each of homozygous dominant, heterozygous dominant and homozygous recessive genotypes respectively.
In Codominance, phenotypes of both the dominant and recessive genotype is shown in the same individual.
dose-responsecurve. A steep dose-response curve is indicative of a chemical that is rapidly and extensively absorbed and slowly detoxified: therefore, the chemical is more toxic.
