MCQ
What is correct for vertebral column?
- AFormed by $26$ vertebraesent
- BDoersally arranged
- CProtects the spinal cords
- ✓All correct
✓
Answer
Correct option: D.
All correct
d
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(i) Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex-linked.
(ii) Linkage is the phenomenon, where two or more linked genes are always inherited together and their recombination frequency in a test cross progeny is less than 50%.
(iii) All the genes present on one chromosome form a linkage group and its number in organism is equal to haploid number of chromosomes.
(iv) When two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters.
(v) In Drosophila genes for white and yellow were very tightly linked and showed only 1.3 percent recombination.
(vi) In Drosophila genes for white and miniature wing showed 37.2 per cent recombination.
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(ii) The hormones produced by hypothalamus are of two types, the releasing hormones and the inhibiting hormones.
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(i) These hormones regulate the synthesis and secretion of pituitary hormones.
(ii) The hormones produced by hypothalamus are of two types, the releasing hormones and the inhibiting hormones.
(iii) Gonadotropin releasing hormone (GnRH) is a releasing hormone.
(iv) Somatostatin is a releasing hormone.
(v) Hormones of hypothalamus reach the anterior pituitary gland through a portal circulatory system.
(vi) The posterior pituitary is under the direct neural regulation of the hypothalamus.