The expected phenotypic ratio for a cross between two individuals that are heterozygous for a given trait is 3:1.
<h3>What is Phenotype?</h3>
This is referred to the physical characteristics of an organism such as the size, shape etc.
When two heterozygous traits are crossed:
Rr × Rr ⇒ RR Rr Rr rr
The ratio is therefore 3:1 of the dominant to recessive phenotype.
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Answer: Testosterone
Explanation: Testosterone is a hormone produced in the human body. In women the ovaries and adrenal gland produce testosterone which is released in small quantities into the blood stream. In women normal level of testosterone ranges from 15- 70 nanogram per deciliter. Low levels of testosterone in women can lead to lower sex drive, obesity, depression, lack of muscle tissue, weak bones and fertility issues.