Tuition Center Singapore A Level H2 H1 Biology Tuition – GENETIC BASIS FOR VARIATION

Day-old chicks can be difficult to sex, but their down feathers reveal a sex-linked dominant character called ‘barred’. Female birds are XY and males are XX. Which cross would ensure correct sexing of the resultant chicks?

A) Female-barred, Male-homozygous barred
B) Female-barred,  Male-homozygous unbarred
C) Female-unbarred, Male-heterozygous barred
D) Female-unbarred, Male-homozygous barred

Ans: B 

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