What is a karyotype?
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a. a way to test for chromosomal mutations
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b. a substance that causes mutations
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c. the total number of mutations in a gene
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d. the result of mutations in a genotype
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A. A way to test for chromosomal mutations

Explanation:

A karyotype is used to look for abnormal numbers or structures of chromosomes

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.