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Life ScienceGrade 9-11

Human Karyotyping Answer Key

Arrange human chromosomes into a karyotype and identify chromosomal abnormalities.

Looking for Human Karyotyping answers? This complete answer key provides verified solutions for all student exploration activities and assessment questions in the ExploreLearning Human Karyotyping Gizmo.

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Prior Knowledge Questions

Q1.What is a karyotype?

Answer

A karyotype is an organized image of all chromosomes in a cell, arranged in homologous pairs by size.

Q2.How many pairs of chromosomes do humans have?

Answer

Humans have 23 pairs of chromosomes (46 total): 22 pairs of autosomes and 1 pair of sex chromosomes.

Q3.What determines biological sex in humans?

Answer

The sex chromosomes determine biological sex: XX = female, XY = male.

Activity A – Identifying Abnormalities

Q4.What is Down syndrome caused by?

Q5.What is nondisjunction?

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