Charles Darwin; he studied the different beak shapes/sizes of Galapagos finches and found that over time, they changed due to their needs for the food found around them (evolution).
I think they speed up reactions :P
Solution:
Cell-division control affects many aspects of development. Caenorhabditis elegans cell-cycle genes have been identified over the past decade, including at least two distinct Cyclin-Dependent Kinases (CDKs), their cyclin partners, positive and negative regulators, and downstream targets. The balance between CDK activation and inactivation determines whether cells proceed through G1 into S phase, and from G2 to M, through regulatory mechanisms that are conserved in more complex eukaryotes.
This is the required process through phosphorylation, Cdks signal the cell that it is ready to pass into the next stage of the cell cycle. As their name suggests, Cyclin-Dependent Protein Kinases are dependent on cyclins, another class of regulatory proteins. Cyclins bind to Cdks, activating the Cdks to phosphorylate other molecules.
Each parent contributes one allele describes the influence that parents have on whether or not offspring inherit a genetically inherited trait.
Explanation:
Allele is a form of gene present on the chromosome. Human have 2 alleles for a trait on a chromosome. Each parent contributes one of its allele to the progeny.The alleles for the gene are present on the same locus of chromosomes.
The alleles are either dominant or recessive. The contribution of alleles and the expression of trait decide the alleles of offspring.
The phenotype is determined by the allele expressed as short or tall and human ABO blood type.
An allele is sequence of DNA. The organism having two same alleles are homozygous and having two different alleles are heterozygous.
