Answer:
Sister chromatids are identical copies of chromatids from chromosomes. They are typically produced through the semi-conservative replication of a single chromosome's DNA. Thus, they can be viewed as'photocopies' of the original parental chromosomes, linked together at the centromere.
They are entirely identical in every aspect, sharing the same genes and allele configurations.
Still, minor variations can occur between the identical sister chromatids due tomutations fromerrors during replication, and differences can also arise in the lengths of telomere repeats.
Non-sister chromatids differ as they arise from separate haploid sex cells during fertilization. These chromatids come from distinct parents and possess different genetic compositions since they do not lie on the same homologous chromosomes. This is why crossing-over results in genetic variation.
However, they may still exhibit genetic similarities if they are part of homologous chromosomes. This is because Synapsis of the bivalents in these chromosomes permits the exchange of genetic material through crossing-over between non-sister chromatids, thereby sharing identical genetic traits.
Explanation:
They possess a unique gene that grants them immunity. Please consider rewarding me with a medal.
Answer:
A. The ecosystem absorbs significant rainfall, aiding in flood prevention.
C. At times throughout the year, water may either saturate the soil or remain just beneath its surface.
D. It might be classified as a freshwater bog, swamp, or marsh.
Explanation:
Answer B is the only one that stands out from the rest, as it directly pertains to a river.
Answer:
1. Insulin binds to the alpha subunit of the insulin receptor
2. Insulin receptor tyrosine kinase is activated
3. IRS proteins are phosphorylated
4. PDK1, a PIP3-dependent protein kinase, is activated
5. Phosphinositide 3-kinase (PI-3K) is phosphorylated
6. PIP2 is converted to PIP3
7. Akt is activated
8. Glut4 receptors are moved to the cell membrane
