In biology, the inner lining of tubular structures is called a lumen.
This can refer to numerous tubular structures in the body, such as the lumen of the veins and arteries, the lumen of the intestines or the tubes in the kidneys.
This term can also be used to describe a space defined by membranes of cell organelles such as the lumen of the mitochondria, the Golgi apparatus, and others.
Answer:
A) One of the genotype i.e true breed white is lethal
B) No
Explanation:
A) Two hamsters with white spots are crossed, 2/3 of the offspring possess white spots and 1/3 has no spots.
This means that the two white hamsters would be carrier for the trait of no spot.
The ratio for offspring signifies that one of the offspring dies because of lethal genotype.
B) No, because the true breed for white spotting is lethal.
However, heterozygous white spotting can be detected.
Minerals will be the correct answer because they are needed to start everything
The answer is False. The mediastinum is not a cartilage that
forms the lower portion of the breast bone, the mediastinum is the middle part
of the chest cavity, which is located between the lungs of an individual. The
Mediastinum is the area located between the lungs, it contains organs such as
the heart and its large arteries and veins. It may also include the trachea,
the esophagus, the bronchi and last but not the least the lymph nodes.