1.Which of the following CORRECTLY orders the sequence in which genes controlling the development of the anterior-posterior axis of Drosophila larvae are expressed?
maternal-effect genes, gap genes, pair-rule genes, segment-polarity genes
maternal-effect genes, gap genes, segment-polarity genes, pair-rule genes
pair-rule genes, maternal-effect genes, segment-polarity genes, gap genes
maternal-effect genes, segment-polarity genes, pair-rule genes, gap genes
gap genes, pair-rule genes, segment-polarity genes, maternal-effect genes
2.
Maternal-effect genes:
are expressed by the mother.
affect maternal phenotype.
affect offspring phenotype.
are expressed by the mother and affect maternal phenotype.
are expressed by the mother and affect offspring phenotype.
3.
Cellular differentiation progressively restricts cell fate because the unexpressed genes in the cell:
become more densely packed with nucleosomes.
accumulate point mutations.
accumulate deletions.
accumulate both point mutations and deletions.
undergo increasing repression.
4.
The finding that induced pluripotent stem cells (iPS cells) can be created by activation of a small number of genes implies that:
aging can eventually be reversed.
dying cells can be revitalized.
cancer cells can be killed by targeting these genes.
developmental restriction of cell fate is reversible.
None of the answer options is correct.
1.Which of the following CORRECTLY orders the sequence in which genes controlling the development of the anterior-posterior axis of Drosophila larvae are expressed?
maternal-effect genes, gap genes, pair-rule genes, segment-polarity genes | ||
maternal-effect genes, gap genes, segment-polarity genes, pair-rule genes | ||
pair-rule genes, maternal-effect genes, segment-polarity genes, gap genes | ||
maternal-effect genes, segment-polarity genes, pair-rule genes, gap genes | ||
gap genes, pair-rule genes, segment-polarity genes, maternal-effect genes |
2.
Maternal-effect genes:
are expressed by the mother. | ||||||||||||||||||||||||||||||||
affect maternal phenotype. | ||||||||||||||||||||||||||||||||
affect offspring phenotype. | ||||||||||||||||||||||||||||||||
are expressed by the mother and affect maternal phenotype. | ||||||||||||||||||||||||||||||||
are expressed by the mother and affect offspring phenotype. 3. Cellular differentiation progressively restricts cell fate because the unexpressed genes in the cell:
|