AP BIOLOGY

Detailed explanation-1: -Maize has ten pairs of chromosomes, which means that the number of autosomes in its haploid cell is 10. Hence, total number of linkage groups will be 10, provided all the genes are mapped.

Detailed explanation-2: -Number of Linkage group = Number of autosomes (non-sex chromosomes) present in the haploid cell. Hence according to the question, a cell that has 10 pairs of chromosomes will have 10 Linkage groups.

Detailed explanation-3: -The 20 chromosomes in a corn plant are thus made of 10 homologous chromosome pairs. This idea is particularly useful in understanding the meiosis. Genes at corresponding locations do not have to be different; when they are different, it’s called heterozygous, as in an F1 hybrid.

Detailed explanation-4: -Hence, in maize, the chromosome number in the diploid meiocytes (2n) is 20. The gametes or the reproductive cells (n) have 10 chromosomes. Since a somatic cell is diploid (2n) has chromosomes from two sets of gametes inherited from each parent, the total number of chromosomes in a somatic cell is 20.

Detailed explanation-5: -The total number of linkage groups in an organism equals to the number of autosomes in its haploid cell. Pisum sativum has seven pairs of chromosomes which mean that the number of autosomes in its haploid cell is 7. Hence, a total number of linkage groups will be 7 provided all the genes are mapped.