Write a note on Holandric genes.(b) Complete the following table:AB(i) Monosomy(1) ______(ii) ______(2) 2n–2(iii) Trisomy(3) ______(iv) ______(4) 2n+2

Question

Q.30 (a) Write a note on Holandric genes. (b) Complete the following table: AB (i) Monosomy(1) ______ (ii) ______(2) 2n–2 (iii) Trisomy(3) ______ (iv) ______(4) 2n+2

Doubtly AI · Accepted Answer

Answer: (a) Holandric genes: genes present on the non-homologous (differential) region of the Y chromosome, which have no alleles on the X chromosome, are called holandric genes (Y-linked genes). They are inherited directly from father to son only, because a son always receives the Y chromosome from his father; females never get these traits. The trait appears in all sons of an affected father (generation after generation in the male line). Examples: hypertrichosis of the ear (hairy pinna), SRY / TDF gene (testis determining factor), porcupine skin, keratoderma dissipatum. (b) AB (i) Monosomy(1) 2n–1 (ii) Nullisomy(2) 2n–2 (iii) Trisomy(3) 2n+1 (iv) Tetrasomy(4) 2n+2

Write a note on Holandric genes.(b) Complete the following table:AB(i) Monosomy(1) (ii) (2) 2n–2(iii) Trisomy(3) (iv) (4) 2n+2

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Your answer

A	B
(i) Monosomy	(1) ______
(ii) ______	(2) 2n–2
(iii) Trisomy	(3) ______
(iv) ______	(4) 2n+2

A	B
(i) Monosomy	(1) 2n–1
(ii) Nullisomy	(2) 2n–2
(iii) Trisomy	(3) 2n+1
(iv) Tetrasomy	(4) 2n+2