Abstract <p>Expansion of the genetic diversity of common wheat (<i>Triticum aestivum</i> L.) at the genes/gene loci determining economically important traits is a fundamental breeding objective. Plant height and grain shape (roundness) are among the traits that are crucial for breeding programs. Dwarf varieties are characterized by lodging resistance, which facilitates the efficiency of mechanized harvesting. Processing of round grains is considered more technologically advanced and productive. Line L1102 (2<i>n</i> = 6<i>x</i> = 42, BBAADD), obtained from crossing triticale (2<i>n</i> = 6<i>x</i> = 42, BBAARR) and an amphiploid (2<i>n</i> = 6<i>x</i> = 42, DDAASS), is characterized by substantially reduced plant height and spherical grain shape. The results of this study showed the presence of two alleles of known dwarfing genes, <i>Rht-D1b</i> and <i>Rht8c</i>, in the L1102 line genome. These alleles may be the main contributors to this trait. Furthermore, six quantitative trait loci (QTLs) were identified for the plant height trait on chromosomes 4AS, 5AL, 6AS, 5BL, 6BS, and 7BL, three of which being associated with reduced plant height (<i>QPht.icg-5A</i>, <i>QPht.icg-6A</i>, and <i>QPht.icg-6B</i>). Furthermore, dwarfing genes with locations similar to <i>QPht.icg-6B</i> are currently unknown. For the grain shape (roundness) trait, three putative QTLs with positive additive effect were mapped to chromosomes 5AL, 3BS, and 6BS. Genes and QTL loci associated with the grain shape trait located on chromosome 6B, similar to the identified in our study <i>Qr.icg-6B</i> locus have not been described in the literature. Analysis of SNP genotyping data from the F₂ mapping population (line L1102 × Lutescens 85) suggests that the <i>QPht.icg-6B</i>/<i>Qr.icg-6B</i> locus, which affects both studied traits (plant height and grain shape), is of alien origin and may originate from rye or <i>Ae. speltoides</i>.</p>