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4.Principles of Inheritance and Variation
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In the hexaploid wheat, the haploid $(n)$ and basic $(x)$ numbers of chromosomes are
A
$n = 21$ and $x = 21$
B
$n = 21$ and $x = 14$
C
$n = 21$ and $x = 7$
D
$n = 7$ and $x = 21.$
(AIPMT-2007)
Solution
(c) : Hexaploid wheat is a result of allopolyploidy induced by doubling the chromosome number of the hybrid produced by crossing two different plants. In hexaploid wheat Triticale $2n = 6x = 42$. So $x$ stands for basic chromosome number and $n$ for haploid chromosome number. So, $n = 21$ and $x = 7$ for hexaploid wheat.
Standard 12
Biology
Similar Questions
The following diagram shows two chromosomes and the lettered number represents the genes
chromosome $1$ :
| $P$ | $Q$ | $R$ | $S$ | $T$ | $U$ | $V$ |
$W$ |
chromosomes $2$ :
| $E$ | $F$ | $G$ | $H$ |
Which of the following would result if a translocation occurred between chromosome $1$ and $2 ?$
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