Q4 of 43 Page 1

Name the disorder in humans with the following karyotype:

(a) 22 pairs of autosomes + XO


(b) 22 pairs of autosomes + 21st chromosome + XY


a) This condition in females results in Turner’s syndrome. It leads to short height and failure to develop ovaries in the female.


b) This type of karyotype result in Down’s syndrome.This leads to distinct facial appearance , intellectual disability , thyroid and heart problems.


More from this chapter

All 43 →
2

‘Swiss cheese’ is characterised by the presence of large holes. Name the bacterium responsible for it.

 3

What do ‘X’ and ‘Y’ represent in the transcription unit of the DNA molecule shown?


 5

If the diploid (2n) number of chromosomes in an angiospermic plant is 16, what will be the number of chromosomes in its endosperm and antipodal cells?

OR


State the reason why pollen grains lose their viability when the tapetum in the anther is malfunctioning.


 6

Differentiate between spermiogenesis and spermiation.