A green bird that has a white off spring A yellow bird that has a green parent A blue bird that has two parents A white bird that had a green parent and a blue parent.
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- Two pair of alleles are known to interact in the production of feather color in parakeets. Allele B is needed for Blue pigment, whereas the recessive “b” resulted in lack of color. The dominant C is associated with yellow pigment whereas the recessive allele “c” also resulted in lack of color. Blue and Yellow pigments together produce green feather color. Give the genotype of each of the following
- A green bird that has a white off spring
- A yellow bird that has a green parent
- A blue bird that has two parents
- A white bird that had a green parent and a blue parent.
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- When you decide to breed your Labrador retriever Molly and sell the puppies, you discover that two of Mollys four siblings have developed a hip disorder that is traceable to the action of a single recessive allele. Molly herself shows no sign of the disorder. If you breed Molly to a male Labrador that does not carry the recessive allele, can you assure a purchaser that the puppies will also be free of the condition? Explain your answer.In canaries, feather length is determined by a sex-linked gene at the G locus with two alleles. The wild-type allele produces long feathers while thedominant allele results in short feathers. An autosomal locus determines feather density (called plumage) where the dominant A allele causes denseplumage. A long-feathered female with thin plumage mates with a male that has short feathers and a dense plumage. Their first chick is a female with longfeathers and thin plumage. a) What is the genotype of the male parent in this cross? b) If the next chick is a male, what is the probability of him having short feathers and thin plumage? c) A chick is caught that is pure-breeding for long feathers and dense plumage. However, you believe this chick was not from these parents. Provide areason that supports your idea.In genetics, the dash symbol (–) is a “wild card” that stands for either the dominant allele or the recessive allele; for example, A– means the individual has either the genotype AA or Aa. Two genes that undergo independent assortment affect coat color in Duroc pigs. Each gene has two alleles, one of which is dominant for coat color. Genotypes of the form A– B– are red, those of the form A– bb and aa B– are sandy, and genotype aa bb is white. What ratio of red:sandy:white is expected from the cross Aa Bb x Aa Bb?
- Black is the dominant for color for rabbits and white is the recessive. B stands for the black allele and b represents the white allele. A white rabbit would have a genotype of bb and a black rabbit would have a genotype of BB or Bb.Some swallowtail butterflies have red forewings, whereas others have white forewings. You cross two white-winged butterflies and observe progeny that display a phenotypic ratio of 2 white: 1 red. What can you conclude from this result? the white allele is completely dominant to the red allele and the white allele is recessive lethal the white allele is partially dominant to the red allele the red allele is completely dominant to the white allele the red and white alleles are co-dominant none of the conclusions listed here can be made from the results given the red allele is completely dominant to the white allele and the red allele is recessive lethalIn an example of recessive epistasis the deposition of pigment into hair follicles of the Labrador Retriever is governed by a dominant gene (C) and lack of deposition by its recessive allele (c). Lack of pigment deposition produces a yellow coat color. The color of pigment is governed by an independently assorting hypostatic gene, the dominant allele (B) produces black pigment and its recessive allele (b) produces brown. What coat color ratio is expected from the cross of a brown dog (bbCc) to a black dog (BbCc)? 3/8 black, 1/8 brown, 1/2 yellow 3/8 black, 3/8 brown, 1/4 yellow 1/2 brown, 1/2 black 1/2 black, 1/4 brown, 1/4 yellow 1/4 black, 1/4 brown, 1/2 yellow
- Let’s suppose that pigmentation in a species of insect is controlled by a single gene existing in two alleles, D for dark and d for light. The heterozygote Dd is intermediate in color. In a heterogeneous environment, the allele frequencies are D = 0.7 and d = 0.3. This polymorphism is maintained because the environment has some dimly lit forested areas and some sunny fields. During a hurricane, a group of 1000 insects is blown to a completely sunny area. In this environment, the fitness values are DD = 0.3, Dd = 0.7, and dd = 1.0. Calculate the allele frequencies in the next generation.In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with purple flowers crossed with a tall plant with white flowers produces 3/8 tall purple, 1/8 tall white, 3/8 dwarf purple, and 1/8 dwarf white. What is the genotype of the parents? a. Dd Pp x Dd pp b. DD Pp x dd pp c. DD Pp x dd Pp d. Dd Pp x Dd Pp e. Dd pp x dd PpIn birds there are two genes that both influence beak phenotype. The first is an autosomal gene for beak colour with two alleles – a dominant allele for a black beak and a recessive allele for a grey beak. The second gene for beak shape is a sex-linked gene with two alleles – a dominant allele for sharp beaks and a recessive allele for rounded beaks. A cross between a male with a black, rounded beak and a female with a black, sharp beak are expected to produce the following offspring:3 males with black, sharp beaks : 3 females with black, rounded beaks : 1 male with a grey, sharp beak : 1 female with a grey, round beak Based on this cross, answer the following questions:i) Please provide appropriate symbols for the two alleles for beak colour. ii) Please provide appropriate symbols for the two alleles for beak shape.iii) What is the probability that a chick born to these parents will have a rounded beak? iv) What is the probability of a male chick having a sharp beak? v) What is the…
- Which of the following statements is/are false regarding alleles? (Select all correct answers.) For a given species, every gene has only two alleles All disease causing alleles are recessive to the wild-type allele A single allele can be recessive to the wild-type allele for one phenotype, but dominant to the wild-type allele for a different phenotype. For any pair of alleles of a given gene, the same dominant/recessive relationship will be found for all phenotypes affected by that geneIn mice, the presence of a dominant A allele results in the agouti pattern of fur color, whereas the aa homozygous recessive results in a solid color pattern. The presence of another dominant B allele results in black fur color, whereas the homozygous recessive bb results in brown fur color. The presence of a third dominant C allele is required for any color to be observed (brown or black), whereas the homozygous recessive cc results in lack of any color whatsoever (albino). What is the phenotype of a mouse with the following genotype? Aa bb cc albino Agouti color pattern and brown Solid color pattern and brown Agouti color pattern and black Solid color pattern and blackTri-hybrid: Zombie “speed” is a trait determined by the alleles F and f at the speed gene, where fast is dominant to slow. Zombie “brain eating” is a trait determined by the alleles B and b at the brain-eating gene, with eating brains recessive to not eating brains. Zombie drooling is a trait determined by the alleles D and d at the drooling gene where not drooling is recessive to drooling. Cross: A female Zombie that is ffbbDd has offspring with a male Zombie that is FFBbdd. What percentage of the offspring will be fast? What percentage of the offspring will be brain eaters? I'm having trouble with how these is set up as a punnent, and then calculating probability.
