Human Karyotyping Answer Key
Arrange human chromosomes into a karyotype and identify chromosomal abnormalities.
Prior Knowledge Questions
Q1.What is a karyotype?
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?
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?
The sex chromosomes determine biological sex: XX = female, XY = male.
Activity A – Identifying Abnormalities
Q1.What is Down syndrome caused by?
Down syndrome (Trisomy 21) is caused by having three copies of chromosome 21 instead of two.
Q2.What is nondisjunction?
Nondisjunction is the failure of chromosomes to separate properly during cell division, resulting in cells with abnormal chromosome numbers.
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