The following question refers to the Punnett square below. Which letter represents a homozygotic dominant progeny? 
Definitions:
Stem Cells
Cells with the unique ability to develop into different types of cells in the body and to self-renew.
Simple Squamous Epithelial
A single layer of flat cells lining surfaces involved in diffusion and filtration, such as blood vessels and air sacs of the lungs.
Basement Membrane
A thin, fibrous layer that underlies and supports the epithelial tissue.
Blood Supply
Refers to the delivery of blood through the vascular system to the body's tissues, providing necessary nutrients and oxygen.
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