Which term means the letter combination that illustrates a trait? A. genotype
B. phenotype
C. allele
D. hybrid

A

Explanation:

The entire genetic makeup of an organism; also the combination of genes for one or more specific traits

humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation: