1) How to use pedigrees:
They are diagrams in which people are represented by symbols. Circles
represent female and squares represent males.
The bottom line represents the offspring of the couple above it.
Dark symbols are used to indicate someone who is affected with a
genetic condition.
Not colored symbols indicate someone who is NOT affected.
A heterozygote carrier.can be represented as grey color.
2) How traits are inherited:
Humans have 23 pairs of chromosomes (46 chromosomes) because 23 chromosomes are inherited from the father and the other 23 come from the mother.
With 23 sets, you have two copies of each gene. This copies can be different or the same and based on that there could be different traits for the same gene like black, brown or blond hair.
The answer is; B
Oceans currents circulate heat energy from the sun around the planet hence making the world temperatures more or less within a constant range. The sun heats the equatorial region more than the poles. Warm oceans currents from this region carry this heats toward the higher latitudes and the cold current from the poles cycle back to the equator.
Answer:
In biology, the active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. ... An active sitecan catalyse a reaction repeatedly as residues are not altered at the end of the reaction (they may change during the reaction, but are regenerated by the end).