denetles Problems You moy find it helpful to drow your own Punnett squares below
ID: 132259 • Letter: D
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denetles Problems You moy find it helpful to drow your own Punnett squares below for the following problems Monohybrid Problems with Complete Dominance 1. In mice, black fur (B) is dominant black mouse produces all black offspring. over brown fur (b). Breeding a brown mouse and a homozygous ?. What is the genotype of the gametes produced by the brown-furred parent? b. What genotype is the brown-furred parent? b c. What genotype is the black-furred parent? B d. What genotype is the black-furred offspring? e. If two black-furred F1 mice are bred with one another, what phenotypes will the F2 offspring have, and in what ratio? phenotypes ratio 2. The presence of horns on Hereford cattle is controlled by a single gene. The hornless (H) condition is dominant over the horned (h) condition. A hornless cow was crossed repeatedly with the same horned bull. following results were obtained in the F1 offspring: 8 hornless cattle 7 horned cattle What are the parents' genotypes? coW bull 3. In fruit fles, red eyes (R) are dominant over purple eyes (r). Two red-eyed fruit flies were crossed, producing the following offspring: 76 red-eyed flies 24 purple-eyed flies a. What is the approximate phenotypic ratio of red-eyed to purple-eyed flies? b. Based on your experience with previous problems, what two parental genotypes give rise to this ratio? c. What is the likely genotypic ratio of the F1 offspring?Explanation / Answer
1) The genotype of black furred mouse - BB.
The genotype of brown furred mouse - bb.
Cross between BB X bb
Gametes B b
F1 generation Bb(black furred mouse) X Bb
Gametes formed B and b B and b.
F2 generation:
a) The genotype of the gametes produced by the brown-furred parent - b.
b) The genotype of brown furred parent - bb.
c) The genotype of black-furred parent - BB.
d) The genotype of black-furred offspring - Bb.
e) The phenotypic ratio - 3:1.
Black-furred mice - 3.
Brown-furred mice - 1.
Male/Female B b B BB(black furred mouse) Bb(black furred mouse) b Bb(black furred mouse) bb(brown furred mouse)Related Questions
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