Question 1

What are homologous chromosomes?

Accepted Answer

Homologous chromosomes are corresponding chromosome pairs, with one member inherited from each parent. They carry the same genes at corresponding loci, although their alleles may differ.

Question 2

What is crossing over in meiosis?

Accepted Answer

Crossing over is the reciprocal exchange of corresponding DNA segments between non-sister chromatids of homologous chromosomes. The participating chromatids can acquire new combinations of maternal and paternal alleles.

Question 3

How does crossing over contribute to genetic variation?

Accepted Answer

Crossing over creates new allele combinations on chromatids. When recombinant chromatids later participate in gamete formation, they can increase genetic variation between offspring.

Question 4

Why is the significance of meiosis important?

Accepted Answer

Meiosis maintains chromosome numbers across generations and contributes to genetic variation. It produces reproductive cells from which gametes can develop, while recombination can give new combinations of parental alleles.

Question 5

Do the maternal and paternal colours represent actual chromosome colours?

Accepted Answer

No. They are illustrative tracking labels in this 3D model. Teal identifies maternal origin, yellow identifies paternal origin, and orange highlights the exchange region; these colours are not biological.

Meiosis Homologous Pairing and Crossing Over 3D Lab

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