Question

Which of the following conditions occurs in the person with genotype XO?
A. Cannot survive
B. Will have immature, ambiguous (both male and female) reproductive system
C. Will be phenotypically female but sterile
D. Does not produce steroid hormones
E. None of the above

Answer 1

Hint: A test cross is conducted whether the individual is homozygous or heterozygous dominant. In a test cross, an individual bred with another individual that is homozygous for the recessive trait and offspring of the test cross is determined. This test shows two options - if any offspring produced express the recessive trait, the individual is heterozygous for the dominant allele. If all the offspring produced express dominant traits, the individual is homozygous for the dominant allele.

Complete answer:
Option A: Cannot survive- a person having genotype XO will survive but with certain syndromes or disturbances or defects in any genes or strands in DNA.
Option A is not the correct answer.
Option B: Will have immature, ambiguous (both male and female) reproductive system- males have XY sex chromosomes and female have XX chromosomes. Ambiguity will be abnormal like- increase in one more X or either Y chromosome.
Option B is not the correct answer.
Option C: Will be phenotypically female but sterile- females have typically XX chromosomes increase or absence of X chromosome can result in XO which is abnormal and it is termed as turner syndrome.
Option C is the correct answer.
Option D: Does not produce steroid hormones- steroid hormones are released from the adrenal cortex. These hormones have nothing to relate with chromosomes.
Option D is not the correct answer.
Option E: None of the above- the option is not applicable as one of the above options is correct.
Option E is not correct.

Therefore, Option C is the correct answer.

Note:
Individuals having XO genotype are considered to be having a defect known as Turner’s syndrome. Turner’s syndrome people have less secretion of female sex hormones like-progesterone and estrogen. Characteristics are- infertility, delayed puberty, masculine characters in a female body, stature breast development and all.