SAT Subject Biology Practice Question 109: Answer and Explanation

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Question: 109

19. Triticale is a hybrid of wheat (Triticum turgidum) and rye (Secale cereale), bred to demonstrate the most desirable characteristics of both species. The resulting hybrid possesses four chromosome sets from the maternal wheat plant and two sets from the paternal rye plant. What is the ploidy of these hybrids?

A. Diploid (2n)
B. Triploid (3n)
C. Tetraploid (4n)
D. Hexaploid (6n)
E. Octoploid (8n)

Correct Answer: D


Polyploidy is the term given to organisms with more than two sets of homologous chromosomes where one set is inherited from each parent. In triticale, the offspring possess six sets of chromosomes, making them hexaploid (6n).

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