This principle of diet planning is called adequacy. An adequate diet provides the human body with energy and nutrients for optimal growth, maintenance and repair of tissue, cells and organs. Water, carbohydrates, fats, proteins, vitamins and some minerals comprise the six nutrient classes that are relied upon for performance of essential functions and activities.
What is true of all organisms in the kingdoms Protista, Plantae, Fungi, and Animalia?
A. They are multi-celled.
B. They are photosynthetic.
C. They have cells that contain membrane-bound organelles.
D. They contain cells that lack membrane-bound organelles.
It is possible if the parents are heterozygous (meaning they have a dominant AND recessive allele for the trait.
Well say the allele for orange is X and the allele for green is X.
Let’s say we have two homozygous orange parents. That means they have no trace of green.
XX
X XX XX As you can see, the Punnett
X. XX XX. Square shows that all offspring will have capital X’s, meaning only homozygous orange offspring is produced. No green babies here.
We can try the same thing with a homozygous parent and a heterozygous parent.
Xx
X XX Xx Here we can see that 50% of
X XX Xx the offspring has a lowercase x. That means they are heterozygous. They carry the green trait, but it doesn’t show because it is masked by the dominant orange allele. So no green babies here either.
Finally we can try heterozygous parents.
Xx
X XX Xx 25% of the offspring is
x Xx xx homozygous for orange. 50% of the offspring is heterozygous for orange. And 25% is homozygous for green. There must be two recessive alleles in order for green to show.
The only way to produce green offspring is to have two heterozygous parents.
Answer: C
Explanation: Smaller single-celled organisms have a high surface area to volume ratio, which allows them to rely on oxygen and material diffusing into the cell (and wastes diffusing out) in order to survive. The higher the surface area to volume ratio they have, the more effective this process can be.