A 1:2:1 genotype ratio underlies the 3:1 phenotype ratio in the F2. The purple allele is designated A while the white allele is designated a. What are the genotypes of the 1:2:1 ratio? a. Aa:aa:AA b. AA:aa:Aa c. aa:Aa:AA d. a:AA:Aa e. AA:Aa:aa
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A 1:2:1 genotype ratio underlies the 3:1
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- 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 dogs, black fur (B) is dominant to brown fur (b). In a genetic cross of two dogs that are heterozygous for the color of their fur, what is the genotype and the phenotypic ratio of the offspring? A)F: Bb, Bb, bb; ratio 2;1B)F: BB, bb; ratio 1:1C)F: Bb, bb, bb; ratio 1:1D)F: BB, Bb, Bb, bb; ratio 3:1E) F: BB, Bb; no ratioThe following table shows the number of dogs for certain tail lengths in a population of dogs. Tail Length Number of Dogs very short (less than 1 inch) 2 short (1–5 inches) 5 medium (5–10 inches) 15 long (10–15 inches) 5 very long (15–25 inches) 2 Based on this data, what type of trait is tail length in dogs? (a) Mendelian (b) codominant (c) (d) polygenic
- You are examining a population of snakes in which 20% of the individuals exhibit the recessive phenotype for albinism. If albinism is exhibited only by the genotype aa, how many snakes out of a population of 100 would you expect to CARRY the albinism allele (so be Aa), but be normal color?There are two alleles for the height gene, T for tall and t for short. One parent is a heterozygote, while the other is a recessive homozygotes. Which genotypes, and at which frequencies, are possible from these two parents. a.) 100% heterozygotes b.) 100% dominant homozygotes c.) 50% dominant homozygotes, 50% recessive homozygotes d.) 50% dominant homozygotes, 50% heterozygotes e.) 50% heterozygotes, 50% recessive homozygotes f.) 25% dominant homozygotes, 50% heterozygotes, 25% recessive homozygotes g.) 100% recessive homozygotesIn a certain species of plant loci A, B and C have an additive effect on the colour of the flower. Alleles A, B, and C are dominant and alleles a, b and c are recessive. Knowing that a plant with genotype AAbbCc has a pink flower, which genotype, among the ones listed below, will produce the same phenotype? a. AABBCc b. AaBbCc c. Aabbcc d. aabbcc
- Imagine that Mendel is tending a garden of 100 pea plants. He has 20 plants that are homozygous for the purple allele, 50 plants that are heterozygous, and 30 plants that are homozygous for the white allele. A) What is the frequency of the purple (P) allele? B) What is the frequency of the white (p) allele?A red beetle with genotype AABB is crossed with a yellow beetle with genotype aabb. The heterozygous F1 beetles are crossed to each other to make the F2 generation. If the beetle color trait is controlled by dominant epistasis of allele B over gene A, what phenotype would you expect for an individual with genotype aaBb? Group of answer choices 1.red 2.yellow 3.another color, but not red or yellow 4.either red or yellowWhich of the following statements correctly describes the Law of Independent Assortment? a. A large Punnett square can be used to predict the outcome of a parental cross involving two traits. b. Non-allelic genes do not affect each other if they are located on separate chromosomes. c. Sometimes all alleles lack dominance, which leads to a blending of traits. d. The dominant allele is represented with an uppercase letter and the recessive allele is represented with a lowercase letter.
- Suppose a mutant fruit fly with blue eyes was recently discovered. It is later determined that the blue eye trait is recessive to the wild-type red eye trait. What is the most common way to represent the mutant and wild-type alleles?. Choices are Mutant: Bl, bl Wild-type: Bl+ , re, bl+, or wtIn humans brown eye color is dominant to blue eye color. Suppose that your mother is homozygous and your father is heterozygous and you have brown eyes. If you have a child with blue eyes, what are the possible genotypes of both of your parents? Group of answer choices Mother bb; Father bb Mother BB; Father BB Mother BB or bb; Father Bb Mother Bb ; Father BbUsing the HardyWeinberg Law in Human Genetics In a given population, the frequencies of the four phenotypic classes of the ABO blood groups are found to be A = 0.33, B = 0.33, AB = 0.18, and i = 0.16. What is the frequency of the i allele?