Infants can see objects before they can control their torso, and they can use their hands long before they can crawl or walk. This would indicate that they have a pattern of growth.

The correct answer is cephalocaudal pattern of growth.

Explanation:

Cephalocaudal signifies head to toe, the cephalocaudal pattern of growth is generally witnessed in the initial years of postnatal development, that is, from infancy to toddlerhood. The cephalocaudal development signifies the growth and development starting from the head to the parts below.  

In this pattern of growth, the infant possesses the tendency to first acquire their control over the muscles of the neck that makes them hold their head in a steady manner. The cephalocaudal pattern is the tendency of the infant to make use of their upper limbs first like hands before making use of their lower limbs, that is, for crawling or walking.  

a. Blood type is controlled by multiple forms of a single gene, while the length of corn ears is controlled by many different genes.

Polygenic inheritance refers to a single inherited phenotypic trait that is controlled by two or more different genes.

Polygenic inheritance should not be confused with the effects caused by multiple alleles. In the case of multiple alleles, a gene contains several different allele variants on the same locus of each chromosome, for example the three different alleles which control for blood type – A, B & O.