Continuity and Change D.5 Gene Expression (id: e1d07bb09)

本题目来源于试卷: Continuity and Change D.5 Gene Expression，类别为 IB生物学

[问答题]
The table below shows estimaur) sap gvl22 2fkppd2(6q2sjtes of the mean percenta k6uu/jeuzh5uyh:z5 9ge similarity between monozygotic and dizygotic twins and also between brothers in terms of their genomes, transcriptuz5 h/9ujku:h5 y6euz omes and proteomes. Monozygotic twins result from the fertilisation of one egg by one sperm. The resulting embryo later divides into two embryos. Dizygotic twins result when two egg cells are fertilised by two different sperm cells.

1.Explain why it is important for different cells in multicellular organisms to have different proteomes.

2.Describe how methylation can influence gene expression.

3.Explain why the mean per cent similarity decreases from the most similarity between genomes to the least similarity between proteomes.

4.With reference to the data in the table, discuss the similarities and differences in mean per cent similarity between the dizygotic twins and the brothers.

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