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Table 2 Schematic overview of the effects of SR genes at conception

From: Rainfall-driven sex-ratio genes in African buffalo suggested by correlations between Y-chromosomal haplotype frequencies and foetal sex ratio

 

Wet periods (cohorts)

Dry periods (cohorts)

Body condition and semen quality (population mean)

High

Low

SR-distorter carrier (112)

SR distorter activity

♂-biased sex ratio

Low fertility

SR-suppressor carrier (557)

Low fertility

SR suppressor activity

1:1 sex ratio1

Wild-type (not 112 or 557)

1:1 sex ratio

♀-biased sex ratio2

Frequency haplotype 112

↑ (SR distorter activity)

↓ (low fertility 112-carriers)

Frequency haplotype 557

↓ (low fertility 557-carriers)

↑ (SR suppressor activity)

Frequency other haplotypes

↔

↔

Population sex ratio

♂-biased

♀-biased

  1. 1: Suppressing a hypothesised X-chromosomal SR distorter
  2. 2: ♀-biased due to a hypothesised X-chromosomal SR distorter
  3. ↑: Increasing haplotype frequency
  4. ↓: Decreasing haplotype frequency
  5. ↔: Stable haplotype frequency