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Simmental and Hereford are both white-face breeds of cattle; however, the gene for white face in...

Simmental and Hereford are both white-face breeds of cattle; however, the gene for white face in Simmental is on a different locus from that for Hereford. Both are dominant genes and each breed is homozygous recessive for the other breed’s white-face gene.

a) Therefore, if S represents the dominant gene for white-face in Simmental and H the dominant gene for white-face in Hereford, what is the genotype of each breed?

Assume the cross between these breeds and subsequent inter se mating of the F1s (dihybrids). What is the probability of the following in the progeny of the F1 matings?

b) A white-face calf?

c) A white-face calf given it is homozygous recessive for the allele causing white face in Simmental

d) A twin set where both are white faced

e) A twin set where one is white faced and one solid

f) A twin set where both are solid

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

Simmental = SShh or Sshh

Hereford = ssHH or ssHh

SShh × ssHH = F1 = SsHh (white faced, twin)

SsHh × SsHh = F2

Gametes SH Sh sH sh
SH SSHH SSHh SsHH SsHh
Sh SSHh SShh SsHh Sshh
sH SsHH SsHh ssHH ssHh
sh SsHh Sshh ssHh

sshh

B. Out of 16 progenies, 15 (S_H_, ssH_, S_hh) are white faced. Only, sshh will not be white faced.

C. ssH_ = 3 progenies (sshh is homozygous recessive for simmental but is not white faced)

D. S_H_ = 9 (white faced, both simmental and hereford present)

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