Brown eyes, straight thumb, and straight hairline are examples of different genotypes.
a. true
b. false

True

Explanation:

Genotype is defined as the genetic makeup of an individual, ie the set of all genes in that organism. The gene, in turn, can be defined as a specific nucleotide sequence of DNA that stores hereditary information. They present information that will be responsible for a given characteristic.

Each individual has a specific genotype that is made up of genes from their parents that will be kept for the life of the organism. This information is important to differentiate genotype from phenotype, because, while the genotype is not changed, the phenotype may undergo several modifications during the development of the organism.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.