28. Of the following A)gonads b)internal r choices, which develops earliest duri
ID: 3519351 • Letter: 2
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28. Of the following A)gonads b)internal r choices, which develops earliest durin d g the stages of sexual development? organs c)secondary sexual characteristics d)hormones e)external genitals I reprodu ctive 29. The development of the Wolfian ducts (male) i androgens/testosterone c)progesterone d)glucocorticoids e s dependent on the release of a)adrenalin 30. In the Androgen Insensitivity Syndrome the person has a)x)Y chromosomes c)primarily progesterone d)primarily estrogens 31. What is a chromosomes b)xX e)both a and c common cause for a genetic female (xx) to develop a partly masculinized anatomy? A)she has an extra Y c hromosome b)her ovaries produce testosterone c)her adrenal glands produces large amounts of testosterone d)she lacks estrogen 32.If the sexual orientation of monozyotic twins has a higher concordance rate (correlation) than dizygotic twins, this would suggest that sexual orientation is influenced by a)having brothers b)having sisters c)epigenetics d)genes e)proteins 33. The "fraternal birth order effect" indicates that the probability of a homosexual orien tne tation thers c)the increases if a)a boy is the youngest in a family of girls b)a boy has older bro mother prefers boys over girls d)if the mother prefers girls over boys 34.A female is more likely to have a lesbian or bisexual orientation if a)she has older brot arg hers ? b)she was exposed to prenatal estrogen c)she was exposed to prenatal testosterone d has Turner's Syndrome e)if she has XXX chromosomes 35. In humans, there are of chromosomes in each nucleus. A)3 pairs b)13 pairs c)20 pairs d)23 pairs e)48 pairs 36.Our DNA is like a "blueprint" and we are the result of all our genes being expressed. A)true b)false 37. In the absence of an SRY gene, the embryo will develop with male characteristics. A)true 38. Chromosomal sex is determined by the sperm. A)true b)false 39. During prenatal sexual development, gonads release neurotransmitters. A)true b)false 40.Adult human do not grow new neurons. A)true b)false 41. Exposure to prenatal androgens will cause an XX fetus to develop male-like genitals. A)true b)false b)falseExplanation / Answer
28. a) Gonads appear ( differentiate) earliest at the 7th weak of fetal development. Hormones secreted by differentiated gonads induce the development of external and internal reproductive organs. Secondary sexual characteristics appear during puberty.
29. b)
30. a). In AIS, the person has 46, XY karyotype but are phenotypically female. Due to lack of androgen receptor, the androgen testosterone produced by testis is converted to estrogen which brings feminine form in the body.
31.c). If a genetic female is unable to produce cortisol ( a hormone of adrenal cortex), then pituitary gland continue sending signal to adrenal gland for production of hormone. Adrenal then produce its hormones in large amount. It includes testosterone also. testosterone develops partly masculinized anatomy.
32. d). Sexual orientation is influenced by hereditary factors, though environmental factors on also play some role in gene expression (epigenetics).
33. b). This is because of a change in brain function caused by antibodies produced in the body of the mother. The mother produces the antibodies when a protein synthesised in the body of her first child enters her blood.
34. c)
35. d).
36. b) DNA is the blue print of our life but all the genes in our body are not expressed.
37. b)
38. a) Ovum always contain X chromosome but sperm may carry X or Y chromosome. If X chromosome carrying sperm fertilizes an ovum, the child will be a female. if Y chromosome carrying sperm fertilizes an ovum, the child will be a male.
39. b) Neurotransmitters are released from nerve endings. Gonads release hormones during prenatal sexual development.
40. a) True.
41. a)
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