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Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
- If instead of 40 cM the two gene loci are 30 cM apart and an AAbb and aaBB individual mate:
- What gametes will the F1 individuals produce and in what frequencies?
- What
phenotype classes and in what frequencies are expected in the F2 generation Note:Assume complete dominance for both genes.
Step by step
Solved in 3 steps
- What is the expected phenotypic ratio (expressed in lowest term) in the offspring of parents, both with blood type AB and heterozygous for the production of H substance? Note: A ratio expressed in lowest term is one in which there is no common factor among all the terms (e.g. 1:2:1 or 9:3:3:1).In fruit flies, gray body (G) is dominant to black body (g). If a male with a black body mates with a female that is homozygous dominant for her gray body what are the possible genotypes and phenotypes of their offspring? Complete the Punnett square below. What is the expected phenotypic ratio among the offspring?A cross between an orange-brown male and a homozygous black female produce four kittens. What is the phenotypic probability of the offspring? probability of the offspring?
- What would the genotypes and genotypic ratio be for the F2 generation produced in a phenotype and phenotypic ration of F1 individuals that were produced from a male blue tailed gecko crossed with a female green tailed gecko, being that all 28 of the offspring had green tails, were mated brother and sister?There is a species of fish in which homozygous recessive (rr) individuals are Yellow and homozygous dominant (RR) individuals are Red. Color in this species of fish exhibits incomplete dominance. If we mate a homozygous dominant individual with a heterozygous individual, what is the phenotypic ratio of the offspring? Group of answer choices 2 Red : 2 Orange. 4 Red. 3 Red : 1 Yellow. 1 Red : 2 Orange : 1 Yellow.What would the phenotypes and the phenotypic ratio be if the F1 individuals produced in a male blue tailed gecko being crossed with a female green tailed gecko, and all 28 of the off spring having green tails, were mated brother sister?
- The genetic identity of the female parent is RrGg and the genetic identity of the male parent is Rrgg. They produce 320 offspring together from a single mating: 57 red-eyed females with grey bodies, 61 red-eyed females with yellow bodies, 22 brown-eyed females with grey bodies, 20 brown-eyed females with yellow bodies.59 red-eyed males with grey bodies, 63 red-eyed males with yellow bodies, 20 brown-eyedmales with grey bodies, 18 brown-eyed males with yellow bodies. Show the simultaneous transmission of the two genes involved to give rise to the progeny given with the use of genetic diagrams and summaries as required. (Hint: you are only requiredto show the simultaneous transmission from the P to F1 generations)Consider the following three point trihybrid testcross ibvolving traits in dragons. The genotypes determining the 8 progeny types from this testxross are shown below out of a sample of 1572 flies. What number of progeny for each genotype would you predict in the case of independent assortment. gametes number K L M 621 klm 608 k L M 103 K lm 109 K lm 64 k L m 57 K L m 3 k l M 7In frost moths, two alleles of one gene determine the character difference of spotted versus striped wings and two alleles of a separate, independent gene determine the character difference of orange wing background versus white wing background. The results for four matings of moth phenotypes are shown below. Number of progeny Mating Parental Phenotypes Spotted/orange Spotted/white Striped /orange Striped /white 1 spotted/orange x striped/orange 623 0 637 0 2 spotted/white x striped/orange 0 0 0 712 3 spotted/white x striped/orange 122 131 128 133 4 spotted/orange x striped/white 0 0 430 422 6a) Using the information in the table above, assign a letter to each allele (make sure each allele can be uniquely identified, using Uppercase and lowercase and use a unique letter for each trait). Circle whether each allele is dominant (D) or recessive (R) below
- In frost moths, two alleles of one gene determine the character difference of spotted versus striped wings and two alleles of a separate, independent gene determine the character difference of orange wing background versus white wing background. The results for four matings of moth phenotypes are shown below. Number of progeny Mating Parental Phenotypes Spotted/orange Spotted/white Striped /orange Striped /white 1 spotted/orange x striped/orange 623 0 637 0 2 spotted/white x striped/orange 0 0 0 712 3 spotted/white x striped/orange 122 131 128 133 4 spotted/orange x striped/white 0 0 430 422 striped= S(dominant) spotted=s (recessive) white= W(dominant) orange=w (recessive) What are the genotypes of each parent in each cross? If more than one genotype is possible, list the alternative possibilities. (Remember that each mating involves a separate set of parents, so the 4 matings involve 8 separate…For the polydactyly trait, P = polydactylous (having 6 fingers), p= normal (having 5 fingers). What is the probability (at each ,ating) that two parents who are both homozygous dominant for the trait will produce a 6 fingered offspring? 0% 25% 50% 75% 100%In sesame plants, the one-pod condition (P) is dominant to the three-pod condition (p), and normal leaf (L) is dominant to wrinkled leaf (l). Pod type and leaf type are inherited independently. Determine the genotypes for the two parents for all possible matings producing the following offspring: 318 one-pod, normal leaf and 98 one-pod, wrinkled leaf. show your solution using punnet square
