Practice question
Question
A 1:1:1:1 arrangement of alleles in tetrad indicates
Explanation
Ordered tetrad arrangement displaying 1:1:1:1 pattern alleles like alternating AAaaAAaa blocks or ABab interleaving indicates alleles remained together through meiosis I due crossover between gene and centromere preventing separation at first division. Heterozygous daughter nuclei after first division segregate alleles only at second division, generating alternating genotype blocks rather than contiguous blocks. This pattern defines second division segregation, contrasting with first division segregation where identical alleles cluster together contiguously. Counting such alternating asci yields SDS frequency used for centromere mapping, revealing recombination events between locus and centromere.
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