19. It is thought that Peter Pan Syndrome is a disorder that may be caused by an

Question

19. It is thought that Peter Pan Syndrome is a disorder that may be caused by androgen insensitivity. In this vein, extreme cases of Peter Pan Syndrome A. May result in XY male B. May result XX male C. May result in an XY female D. May result in an XX male having Muellerian ducts 20. Which of the following defines metabolism? a) continuance of living organisms while passing down traits from parent(s) to child(ren) b) the sum total of all chemical processes. c) the release of energy from covalent bounds d) the movement of water from higher concentration to lower concentration 21. An image that could demonstrate that a person has Down's Syndrome is A. karyotype B. karion C. kryptosome D. All of the above. 22. What is the gonadal sex of XYSPm? A. Male B. Female C. Inconclusive D. EyehaveNoldea 23. elowy is the dominant phenotope. The F1 generation has a 11 yellow phenotype. What is the genotype of the parent generation? A. One parent is homozygote dominant and the other is homozygote recessive B. One parent is heterozygote and the other parent is homozygote for yellow allele C. Both parents are homozygote for yellow allele D. Both parents are homozygote recessive 24. When Mendel crossed pure-breeding purple and white flowered pea plants, the dominant to recessive phenotypic ratio in the F1 generation was A) 3:1 B) 4:0 C) 4:1 D) 4:0 E) 9:3:3:1

Explanation / Answer

19. May result in XY female.

persons suffering from androgen insensitivity syndrome are females from their external appearance but their body cells contain X and Y chromsome. Y chromosome bears SRY gene that causes gonads to differentiate into testis, which produce testosterone. Testosterone stimulates embryonic tissue to develop into male characteristics. But for testosterone to have its effects , it must bind to an androgen receptor. This receptor is defective in females with androgen insensitivity syndrome, consequently their cells are insensitive to testosterone and female characteristics develop.

20. B. Sum total of all chemical processes.

metabolism involves two processes; catabolism which involves breakdown of molecules and anabolism involiving formation of new molecules from simple precursors.

21. A. Karyotype.

karyotype refers to number and appearance of chromosomes . Karyotypes describe the chromosome count of an organism and what these chromosomes look like under a light microscope. Karyotype helps us in determining genetic disorders like Down syndrome by examination of chromosomes.

22. A. Male.

SRY, Sex detdrmining region on Y chromsome determines male sex and causes differentiation of gonads into testis.

23.B. One parent is heterozygote and other parent is homozygote for yellow allele.

Homozygote (YY) × Heterozygous (Yy)

offspring; YY, Yy.

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