There is some evidence that selection on white fur color in cats resulted in unintentional selection on hearing abilities. About 40% of white-furred, blue-eyed cats are also deaf. It turns out the gene responsible for pigmentation here also affects the fluid in the ear canals. This is most consistent with what phenomenon in genetics? Inbreeding Linkage Heritability Pleiotropy
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There is some evidence that selection on white fur color in cats resulted in unintentional selection on hearing abilities. About 40% of white-furred, blue-eyed cats are also deaf. It turns out the gene responsible for pigmentation here also affects the fluid in the ear canals. This is most consistent with what phenomenon in genetics?
- Inbreeding
- Linkage
- Heritability
- Pleiotropy
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- Polymorphism of body color is caused by two alleles in a fly. One allele's homozygotes are brown, other homozygotes allele are pale, whereas heterozygotes have orange color. This is the observation made by the experimenters: brown: 100 pale: 100 orange: 50 find the genotype frequncy under hardy-weinberg equil. and then show the calcultaions to find the coefficient of inbredding for this locus.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.Green dragons are known by Knights of the Realm to be cleverer and thus more dangerous than both red and brown dragons. Molecular evolutionary alchemists working for the king have determined that a gene called FIZBAN has an average dN/dS (nonsynonymous rate/synonymous rate) ratio of 1.06 in green dragons, compared to 0.66 and 0.44 in red and brown dragons, respectively. What type of selection is this gene under in each dragon species? What type of trait might this gene contribute to? Give an evolutionary history of this gene in green dragons, including principles of population genetics in your answer.
- About 70% of Americans perceive a bitter taste from the chemical phenylthiocarbamide (PTC). The ability to taste this chemical results from a dominant allele (T) and not being able to taste PTC is the result of having two recessive alleles (t). Albinism is also a single locus trait with normal pigment being dominant (A) and the lack of pigment being recessive (a). A normally pigmented woman who cannot taste PTC has a father who is an albino taster. She marries a homozygous, normally pigmented man who is a taster but who has a mother that does not taste PTC. a. What is the genotype of the woman? [ Select ] b. What is the genotype of the man? [ Select ] > >About 70% of Americans perceive a bitter taste from the chemical phenylthiocarbamide (PTC). The ability to taste this chemical results from a dominant allele (T) and not being able to taste PTC is the result of having two recessive alleles (t). Albinism is also a single locus trait with normal pigment being dominant (A) and the lack of pigment being recessive (a). A normally pigmented woman who cannot taste PTC has a father who is an albino taster. She marries a homozygous, normally pigmented man who is a taster but who has a mother that does not taste PTC. What are the genotypes of the possible children?5) Because of extensive inbreeding, pure-bred dogs are afflicted with many genetic disorders. Most of these disorders are recessive. For example, deafness is a recessive genetic disorder affecting many breeds of dogs, especially Dalmations. Two hearing Dalmations when bred together produced 12 hearting puppies and 4 deaf puppies. What are the genotypes of all the dogs? Parents’ genotype(s)? Hearing puppies’ genotypes (multiple answers)? Deaf puppies genotype(s)? Of the hearing puppies only, how many are expected to be homozygous for this trait (use a Punnett Square to solve).
- About 70% of American perceive a bitter taste from the chemical phenylthiocarbamide ( PTC ). The ability to taste this chemical resultsfrom a dominant allele(T) and not being able to taste PTC is the result of having two recessive allele(t).Albinism is also a single locus trait with normal pigment being dominant(A) abd the lack of pigment being recssive(a).A normally pigmented woman who cannot taste PTC has a father who is an albinotaster.She marries a homozygous,normally pigmented man who is a taster but who has a mother that does not taste PTC.What are the genotypes of the possible children?Let’s suppose that pigmentation in a species of insect is controlledby a single gene that exists as two alleles, D for dark and d for light.The heterozygote, Dd, is intermediate in color. In a heterogeneousenvironment, the allele frequencies are D = 0.7 and d = 0.3. Thispolymorphism is maintained because the environment has somedimly lit forested areas and some sunny fields. During a hurricane,a group of 1000 insects is blown to a completely sunny area. In thisenvironment, the relative fitness values are DD = 0.3, Dd = 0.7, anddd = 1.0. What are the predicted allele frequencies in thenext generation?You conduct an RFLP analysis of head weight in one strain of cabbage;you determine that seven QTLs affect this trait. In anotherstrain of cabbage, you find that only four QTLs affect this trait.Note that both strains of cabbage are from the same species, althoughthey may have been subjected to different degrees of inbreeding.Explain how one strain can have seven QTLs andanother strain four QTLs for exactly the same trait. Is the secondstrain missing three genes?
- Tatuo Aida investigated the genetic basis of color variation in the medaka (Aplocheilus latipes), a small fish found in Japan (T. Aida. 1921. Genetics 6:554–573). Aida found that genes at two loci (B, b and R, r) determine the color of the fish: fish with a dominant allele at both loci (B_ R_) are brown, fish with a dominant allele at the B locus only(B_ rr) are blue, fish with a dominant allele at the R locus only (bb R_) are red, and fish with recessive alleles at both loci (bb rr) are white. Aida crossed a homozygous brown fish with a homozygous white fish. He then backcrossed the F1 with the homozygous white parent and obtained 228 brown fish, 230 blue fish, 237 red fish, and 222 white fish. Q.What results would you expect for a cross between a homozygous red fish and a white fish?Tatuo Aida investigated the genetic basis of color variation in the medaka (Aplocheilus latipes), a small fish found in Japan (T. Aida. 1921. Genetics 6:554–573). Aida found that genes at two loci (B, b and R, r) determine the color of the fish: fish with a dominant allele at both loci (B_ R_) are brown, fish with a dominant allele at the B locus only(B_ rr) are blue, fish with a dominant allele at the R locus only (bb R_) are red, and fish with recessive alleles at both loci (bb rr) are white. Aida crossed a homozygous brown fish with a homozygous white fish. He then backcrossed the F1 with the homozygous white parent and obtained 228 brown fish, 230 blue fish, 237 red fish, and 222 white fish. Q. Give the genotypes of the backcross progenyTatuo Aida investigated the genetic basis of color variation in the medaka (Aplocheilus latipes), a small fish found in Japan (T. Aida. 1921. Genetics 6:554–573). Aida found that genes at two loci (B, b and R, r) determine the color of the fish: fish with a dominant allele at both loci (B_ R_) are brown, fish with a dominant allele at the B locus only(B_ rr) are blue, fish with a dominant allele at the R locus only (bb R_) are red, and fish with recessive alleles at both loci (bb rr) are white. Aida crossed a homozygous brown fish with a homozygous white fish. He then backcrossed the F1 with the homozygous white parent and obtained 228 brown fish, 230 blue fish, 237 red fish, and 222 white fish. Q.What results would you expect if you crossed a homozygous red fish with a homozygous blue fish and then backcrossed the F1 with a homozygous red parental fish?