Which of the following is the CORRECT order of gene groups expressed in normal Drosophila development? 1. Gap genes2. Homeotic genes3. Pair-rule genes4. Segment-polarity genes5. Egg-polarity genes A: 5, 1, 3, 4, 2 B: 1, 2, 3, 4, 5 C: 4, 2, 5, 1, 3 D: 3, 1, 2, 5, 4 E: 5, 2, 4, 3, 1

Most yeast genes are between 5 and 100kb long, and most mammalian genes are less than 2kb long.

Most yeast genes are between 5 and 100kb long, and most mammalian genes are less than 2kb long. A: 正确 B: 错误

Operator: ( ) A: An operator is a DNA region that is working with promoter for genes to express. B: An operator is a DNA region at 5’ of a gene for a repressor to bind to prevent gene expression. C: An operator is a repressor protein to help genes to express. D: An operator is a repressor protein to inhibit genes to express.

Constitutive genes are() A: genes that<br/>are expressed all the time. B: genes that<br/>are not expressed at all the time. C: genes that<br/>are expressed when needed. D: genes that<br/>are repressed.

Translate the following sentences into Chinese.Just as some biological genes can regulate other genes, some of the software genes can switch other software genes on or off.

Genes

中国大学MOOC: Egg-polarity genes directly regulate which group of genes?

What effect does eating genetically modified foods have on your genes （） A: It could cause your own genes to mutate B: It could cause your own genes to absorb the excess genes C: It has no effect on your genes D: The effects on human genetics aren't known

中国大学MOOC: The observation that some genes are mosaics of other genes can be explained by ______.