To determine the aqueous layer-<span>The NaHCO3 solution is an aqueous solution (water is the solvent). Water is more dense than ether and sinks to the bottom, while the ether sits on top. Most organic solvents will be less dense than water, unless you're working with halogenated solvents like methylene chloride, chloroform, or carbon tetrachloride.</span>
A control is the normal behavior you are testing the variable against. There are two types of variables. The independent variable is what you change to test what the dependent variable is, which is the variable that changes due to the independent variable, and what you generally record your data over.
Answer:
Hi, Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.
They prevent energy of some of the absorbed solar energy from leaving the Earth’s atmosphere
Answer: Rare X-linked recessive
Explanation:
In humans our biological sex-determination is based on a pair of sex chromosomes namely, XX in females, XY in males. The genes on our X chromosome are X-linked. and have special patterns of inheritance due to their presence in contrasting numbers in males (XY, 1 X chromosome) and females (XX, 2 X chromosomes); thus they are more common in genetic males.
The observed trait is X-linked, and given that only half the sons are affected, the trait is recessive and carried by the heterozygous mother -heterozygous alleles are two variants of the allele at the same gene locus. The Y chromosome inherited from the father does not carry the gene, thus there is no normal copy available. The incidence for its inheritance is at 50% as the mother has two X hromosomes, one normal, and one carrying the trait.
