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In humans, three genes (Q, R and T) are linked on chromosome 4. A homozygous recessive individual is crossed with a wild-type heterozygote. The resulting progeny is comprised of 6405 individuals, with the following phenotypes.
a. qrt: 8 qrT: 2426
b. Qrt: 540 q Rt: 219
c. QrT: 216 QRT: 10
d. QRt: 2428 qRT: 558