Home › STAAR EOC Biology › Biology › Cell Reproduction › Two homologous chromosomes carry the same genes …
Two homologous chromosomes carry the same genes at the same positions. Why are those genes not identical?
AEach homolog comes from a different cell
BEach homolog is copied at a different time
CEach homolog comes from a different parent
DEach homolog carries a different gene count
Answer & Solution
Correct answer: C. Each homolog comes from a different parent
1. Homologs match in length and carry the same genes at the same loci.
2. One member of each pair arrives in the egg and the other in the sperm.
3. The two parents carry different versions of many of those genes.
4. So the loci line up but the sequences at them can differ, which is the source of variation within a species.
5. The gene count is the same on both homologs, so a different count cannot be the reason.
_Source: OpenStax Biology 1e (CC BY 4.0), Chs 10 and 11, section 10.1 Cell Division_
Related questions
At which stage does the nuclear envelope begin to break into small vesicles?Naming the mitotic stages in order gives prophase, prometaphase, metaphase and then:Conjoined sister chromatids become visible under a light microscope at a diameter of aboutHuman blood type is determined by two versions of a gene drawn from how many possible sequMatched pairs of chromosomes in a diploid organism are described as homologous, yet their Plant cells complete cytokinesis differently from animal cells because they build a:In an animal cell, cytokinesis pinches the cell in two along a structure called the:Spindle microtubules that never attach to a chromosome are called: