Answer:
Photosphere
Explanation:
The inner layers are the Core, Radiative Zone and Convection Zone. The outer layers are the Photosphere, the Chromosphere, the Transition Region and the Corona. IRIS will focus its investigation on the Chromosphere and Transition Region.
Its called <span>Heterozygous</span>
Having a karyotype done is important to detect crucial diseases such as Trisomy 13, Trisomy 21, Klinefelter's Disease, and Turner syndrome.