Segments of DNA can move around within the genome.

Messenger mRNA expression is regulated at the level of translation.

The same gene can code for several different proteins.

Several different genes can code for the same protein.

must to be within a few hundred base pairs of the gene they enhance.

will not function if they are moved experimentally.

must to be within a few base pairs of the gene they enhance.

can be tens of thousands of base pairs from the gene they enhance.

Introns encode proteins and are retained in mRNA, whereas exons are removed from mRNA.

Exons and introns are typically translated into protein.

Only exons are present in genes (DNA), while both introns and exons are present in the mRNA produced from the gene.

Exons are the protein-coding component, while introns are spliced out of RNA as it is processed into mRNA.

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The size of the fertilised egg

Whether the species lays eggs or has live birth

The number of cleavage divisions that precede gastrulation

The density and distribution of yolk

Label the cells with GFP and follow them in an early chicken embryo

Knock out an essential gene required for lower jaw formation in the mouse

Add the cells to the head region of a developing C. elegans

Carry out an EMS mutagenesis screen in Drosophila

Knock down the gene specifically in those neurons in mouse

Use antisense RNA to knock down the gene in Xenopus embryos

Knock out the gene in Drosophila

Delete the gene by making a knockout chicken