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TLS Online TPP Program

#Question id: 34143

Which of the following best explains how normal plasma oxytocin levels at the onset of labor can still result in powerful uterine contractions?

#Unit 7. System Physiology – Animal
  1. The uterus begins secreting its own oxytocin, which inhibits progesterone and directly stimulates the fetal adrenal cortex.
  2. The descent of the fetus stimulates a hypothalamic feedback loop that rapidly increases systemic oxytocin to supraphysiologic levels.
  3. There is a marked upregulation of uterine oxytocin receptors at term, making the myometrium hypersensitive even to baseline oxytocin levels, initiating a positive feedback loop.
  4. Oxytocin receptors on the cervix and vagina directly stimulate the anterior pituitary to secrete oxytocin during early labor.
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TLS Online TPP Program

#Question id: 5440

#Unit 8. Inheritance Biology

Human height is control by 5 pair of polygene . A pure line dominant human has height of 100 cm while pure line of recessive human has 20 cm. What will be average height of human with genotype aabbCCDDEe?
TLS Online TPP Program

#Question id: 5441

#Unit 8. Inheritance Biology

Two pure line of corn have mean cob length of 15 cm and 5 cm, respectively. 6 polygenes involved in this trait exhibit additive gene action. Crossing these two lines is expected to produce a progeny population with mean cob length of
TLS Online TPP Program

#Question id: 5442

#Unit 8. Inheritance Biology

Plant having height 6 cm are allowed to cross with plant having height 2 cm , all F1 progeny having height uniform 4 cm were allowed selfing to produced F2 progeny in which 2 plant out of 32 having height 2 cm . How many pair of polygene is involve in that trait?
TLS Online TPP Program

#Question id: 5443

#Unit 8. Inheritance Biology

Two varieties of maize averaging 25 and 125 inches in height, respectively, are crossed. The F1 progeny is quite uniform averaging 75 inches in height. Plant height is control by 3 QTL, what is the probability of plant with 25 inch height in F2 generation?
TLS Online TPP Program

#Question id: 5444

#Unit 8. Inheritance Biology

Which one of the following statements is INCORRECT?
TLS Online TPP Program

#Question id: 5445

#Unit 8. Inheritance Biology

A plant height in Maize is control by 3 pair of polygene .Two varieties of maize averaging 120 and 60 inches in height, respectively, are crossed. The F1 progeny is quite uniform averaging 90 inches in height. What is percent of F2 progeny that is resemble with either 120 cm or 60 cm height?