It is definitely not a primary source: this would be a book itself.
Now, is it a tertiary source? I don't think so: the author of the review should have read the book and should only be referring to this book in the review.
I think it's a secondary source.
Explanation:
Some of the mice will be homozygous dominant (AA), others will be heterozygous (Aa) and others homozygous recessive (aa).
Because the population isn't homogeneous, the easiest way would be to mate all grey mice on one side, and all yellow mice on the other, and analyze the phenotype of the offspring.
The cross between mice with the recessive trait will have <u>100%</u> offpsring with the recessive trait.
However, the cross between mice with the dominant trait will show some recessive individuals in the offspring:
- AA x AA ---> all A_
- AA x Aa ---> all A_
- Aa x Aa ---> 3/4 A_, 1/4 aa
A. eukaryotes can be unicellular or multicellular
Answer:
The organ system that breaks down food is called the <u>digestive system</u>. It follows a process called <u>digestive track</u> which starts from the oesophagus and ends finally at the <u>rectum</u>.
This is due to the inefficiencies of passing energy from one energy level to the next. Studies have shown that only 10% of energy is passed from a lower trophic level to the next higher level as biomass. The rest is lost in inefficiencies such as heat. This is why the graphical model of energy flow in a community is shaped like a pyramid with the lowest energy levels at the bottom and highest energy levels at the top.