In goats, a beard is produced by an autosomal allele that is dominant in males and recessive in females.  We’ll use the symbol b for the beard allele and + for the beardless allele.  Another independently assorting autosomal allele that produces a black coat (W) is dominant over the allele for white coat (w).  Part A and D have been completed for you and is shown in the image. Give the phenotypes and their expected proportions for the crosses B and C: b) +bWw male    x    +bww female c) ++Ww male   x    bbWw female

Basic Clinical Laboratory Techniques 6E
6th Edition
ISBN:9781133893943
Author:ESTRIDGE
Publisher:ESTRIDGE
Chapter2: Basic Hematology
Section2.1: Introduction To Hematology
Problem 14RQ
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In goats, a beard is produced by an autosomal allele that is dominant in males and recessive in females.  We’ll use the symbol b for the beard allele and + for the beardless allele.  Another independently assorting autosomal allele that produces a black coat (W) is dominant over the allele for white coat (w).  Part A and D have been completed for you and is shown in the image. Give the phenotypes and their expected proportions for the crosses B and C:

b) +bWw male    x    +bww female

c) ++Ww male   x    bbWw female

d. +bWw male X bbww female
b
W
b
W
+
+b
W
+
+b
b
Ww WW
W
bb
W
b
bb
W
WW WW
male
1/1 beard
female
1/2 beardless
1/2 beard:
1/2 black
1/2 white
1/2 black
1/2 white
-1/2 black
1/2 white
Transcribed Image Text:d. +bWw male X bbww female b W b W + +b W + +b b Ww WW W bb W b bb W WW WW male 1/1 beard female 1/2 beardless 1/2 beard: 1/2 black 1/2 white 1/2 black 1/2 white -1/2 black 1/2 white
a. +bWw male
X +bWw female
b = beard
+= beardless
W = black, w = white
+bWw male x +bWw female
If male:
3/4 beard
1/4 beardless
3/4 black
1/4 white
3/4 black
1/4 white
sex-influenced
If female:
9/16
3/16
3/16
1/16
Transcribed Image Text:a. +bWw male X +bWw female b = beard += beardless W = black, w = white +bWw male x +bWw female If male: 3/4 beard 1/4 beardless 3/4 black 1/4 white 3/4 black 1/4 white sex-influenced If female: 9/16 3/16 3/16 1/16
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