Complete the following statements to describe howindependent assortment contributes to genetic variation. Not allchoices will be used.
During independent assortment, ____________ chromosomesseparate.
This separation is ____________ ; it is due to their alignmentdown the metaphase plate.
The maternal or paternal homologue may be oriented toward either____________ .
This randomized separation aids in genetic ____________ foroffspring.
This variation helps in the long-term ____________ of thespecies.
Word Bank:
extinction | non-sister | Survival |
homologous | Plate | Variation |
identical | pole | random |
Complete the following statements of how meiosisincreases genetic variation. Not all choices will beused.
Two events within meiosis increase variability. During prophaseI, ____________ and crossing-over occurs.
This event allows for ____________ to break and rejoin.
This results in two chromosomes with a different combination of____________ than they had before.
During metaphase I, homologous pairs align ____________ at acell's equator.
This results in random separation of maternal and paternalchromosomes when the cell divides, creating ____________combinations of final chromosome combinations in human cells.
Word Bank:
autosomes | 8 | independently | synapsis |
6.02 x 10²³ | dependently | maternal and paternal | nonsister chromatids |
64 | genes | sister chromatids | 2²³ |
Complete the following statements to describe thedifferences between chromosomes and chromatin. Not all choices willbe used.
Genetic material within the nucleus of a cell is typicallyarranged as ____________ , or long tangled collections of DNA andproteins.
During cell division, this DNA condenses into tightly coiledstructures to form ____________ .
Humans have 46 of these; 22 of these pairs are called the____________ and one pair is called the ____________chromosomes.
These ____________ chromosomes control gender. Males have____________ X chromosome and a Y chromosome, while females have____________ X chromosomes.
Word Bank:
autosomes | determinate | two |
chromatin | one | |
chromosomes | sex | |
Complete the following statements to describe thedifferences between chromosomes and chromatin. Not all choices willbe used.
Duplicated chromosomes called ____________ chromatids, containthe same genes.
They are held together by a region called the ____________ .
The chromatids remain together until a phase within mitosis,where the ____________ splits.
At this point, the chromatids separate and two individual____________ chromosomes are fully formed.
Word Bank:
brother | daughter | centromere |
sister | center point | |
