A black feathered cow bird hatches a chick that is white due to a mutation in...
A black feathered cow bird hatches a chick that is white due to a mutation in the gene that makes the black pigment. This white bird manages to mate with a wild type black bird. The offspring are iridescent grey.
Explain briefly how this mating resulted in the new color of cowbird.
If the grey cowbird mates with a black cowbird, what will be the color of the offspring?
Write the alleles assumed in each, and the result of the cross. Use B and b for the alleles.
Homework Answers
let the alleles be B- black, b- white.
the genotype of the blackbird is BB and the genotype of the white bird is bb,
BB * bb
Bb
the heterozygotes show intermediate phenotype ( grey colour) so this is an example of incomplete dominance.
grey * black
Bb * BB
| B | b | |
| B | BB ( black) | Bb ( grey) |
| B | BB ( black) | Bb ( grey) |
the phenotypic ratio is
black: grey=1:1
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A black feathered cow bird hatches a chick that is white due to
a mutation in...
20. (6) A black feathered cow bird hatches a chick that is white due to a...
20. (6) A black feathered cow bird hatches a chick that is white due to a mutation in the gene that makes the black pigment. This white bird manages to mate with a wild type black bird. The offspring are iridescent grey. Explain briefly how this mating resulted in the new color of cowbird. If the grey cowbird mates with a black cowbird, what will be the color of the offspring? Write the alleles assumed in each, and the result...
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20. (6) A black feathered cow bird hatches a chick that is white due to a mutation in the gene that makes the black pigment. This white bird manages to mate with a wild type black bird. The offspring are iridescent grey. Explain briefly how this mating resulted in the new color of cowbird. If the grey cowbird mates with a black cowbird, what will be the color of the offspring? Write the alleles assumed in each, and the result...
In bluebirds, there is an autosomal gene called the feather gene. This gene codes for the feather protein, and this protein controls the color of the feathers. A base- substitution mutation in the feather gene results in a bird with black feathers. When this black-feathered bird mates with a true-breeding normal blue-feathered bird (a black x normal cross), the F1 offspring all have normal blue feathers. Next to each statement below, indicate True or False. The black feather gene allele...
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