Set-up: One trait in a newly discovered species of burrowing mammal What we know about coat color in this species 1_The offspring of a homozygote (true-breeding) black parent and a homozygote (true-breeding) white parent are all gray. 2_When the gray offspring are crossed among themselves, their offspring occur in a ratio of 1 black:2 gray:1 white. CASE 1: Upon close examination of the coats you see that each hair of a gray animal is solid gray. CASE 2: Upon close examination of the coats you see that the gray color effect is due to a combination of individually black and individually white hairs a) What would you conclude about the type of dominance (or allelic relationship) in this trait in CASE 1? Type of allelic relationship or type of dominance: b) What would you conclude about the type of dominance (or allelic relationship) in this trait in CASE 2? Type of allelic relationship or type of dominance:

Set-up: One trait in a newly discovered species of burrowing mammal What we know about coat color in this species 1_The offspring of a homozygote (true-breeding) black parent and a homozygote (true-breeding) white parent are all gray. 2_When the gray offspring are crossed among themselves, their offspring occur in a ratio of 1 black:2 gray:1 white. CASE 1: Upon close examination of the coats you see that each hair of a gray animal is solid gray. CASE 2: Upon close examination of the coats you see that the gray color effect is due to a combination of individually black and individually white hairs a) What would you conclude about the type of dominance (or allelic relationship) in this trait in CASE 1? Type of allelic relationship or type of dominance: b) What would you conclude about the type of dominance (or allelic relationship) in this trait in CASE 2? Type of allelic relationship or type of dominance:

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter12: Mendel, Genes, And Inheritance

Section: Chapter Questions

Problem 7TYK: In cats, the genotype AA produces tabby fur color; Aa is also a tabby, and aa is black. Another gene...

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3- Pigment in mouse fur is only produced when the C allele is present. Individuals of the cc genotype are white. If color is present, it may be determined by the Aa alleles. AA or Aa results in agouti color, while aa results in black coats, When a black female is crossed with a white male, all phenotypes are observed in the offspring. In this case, what should be the ratio of the black offsprings? a) 1/32 b) 1/16 70204 C) 1/4 d) 1/8 1/2 Boş bırak
O e. Parent 2: Parent 1: Parent 2: ¡Ai QUESTION 9 Bi QUESTION 8 Let's assume that, in dragons, red scales (B) are dominant to green scales (b), and long tongues (S) are dominant to short tongues (s). The genes that determine these characteristics assort independently. A homozygous red, long-tongued dragon is crossed with a homozygous green, short-tongued dragon. If an F1 dragon is crossed to a homozygous green and homozygous short-tongued dragon, what phenotypes and proportions are expected in the offspring? O a. 100% green and long-tongued O b. ½ green and short-tongued & ½ red and long-tongued O c. ½ red and short-tongued & ½ green and long-tongued O d.% red and long-tongued, % red and short-tongued, ½ green and long-tongued, % green and short-tongued O e. 9/16 red, long-tongued, 3/16 green, long-tongued, 3/16 red, short-tongued, 1/16 green, short-tongued Save and Submit to save and submit. Click Save All Answers to save all answers. 000 MacBook Air
Test Crosses: Determining Unknown Genotypes 3. Coat color in Labradors is caused by two different alleles of a color gene. The dominant allele, B, generates black fur, while the recessive allele, b, generates brown fur. Your neighbor has a black Labrador and is interested in understanding how to determine if his dog is homozygous or heterozygous for the black coat color genotype. Answer the following questions to determine how a test cross could help your neighbor discover his dog's genotype. a. What are the possible genotypes of your neighbor's Labrador? b. In a test cross, why is the organism of unknown genotype crossed to a homozygous recessive individual? Assign the possible paternal gametes of the unknown Labrador to the vertical axis in each of the Punnett squares at right. Assign the gametes of the homozygous recessive dog to the horizontal axes in each of the Punnett squares. c. What are the expected genotypes and phenotypes of the puppies that will result from the test cross…
Biology Red Fish/Blue Fish Codominance/Incomplete Dominance 1. Find the probability of the following genotypes and phenotypes for their F1 generations. Use a Punnett Square. P1 = BB = Blue Fish P2 = RR = Red Fish These genes are codominant for color. When the genes are crossed the offspring are striped red and blue (BR) Probability of Genotype of offspring: % BB % BR % RR edu gear
for abor Monohybrid crossing the monohybrid and dihybrid crosses. 1. A baby with type Ab blood is born into a family where the mother has type B blood and father type O blood. (i) Determine whether the husband is the biological father of the baby. Explain your answer in (i) above. (ii) 2. Silky feathers in fowls are caused by an allele which is recessive to the allele for normal feathers. 200 birds were raised from a cross between two heterozygous individuals. Predict the number of the birds that would expected to be silky and those expected to be normal. If about half of the offspring turned out to be silky, comment on the nature of the normal. If you had normal feather birds, propose the easiest way to determine whether its homozygous or heterozygous. 3. In dogs, black fur is dominant to white fur. Determine the possible offspring from crosses between: Homozygous black and white. (1) Heterozygous black and heterozygous black. (iii) Detach this page from your manual and att ch it to…
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In cats, the genotype AA produces tabby fur color; Aa is also a tabby, and aa is black. Another gene at a different locus is epistatic to the gene for fur color. When present in its dominant W form (WW or Ww), this gene blocks the formation of fur color and all the offspring are white; ww individuals develop normal fur color. What fur colors, and in what proportions, would you expect from the cross AaWw Aa Ww?
Part 2. Do one more example of a monohybrid cross. This time assign the letter "B" for onion taste. Being sweet is dominant controlled by allele (B) and being bitter is recessive-controlled by allele (b). Cross individuals who are both heterozygous for this trait. 5. What is the genotype of each of these heterozygous individuals? 6. What is the phenotype of these heterozygous individuals? Complete the Punnett square below using the alleles you just listed. 7. What are the resulting genotypes and their ratios or %? 8. What are the resulting phenotypes and their ratios or %? Figure 3. Monohybrid Cross for Onion Taste. 103
Incomplete Dominance 1. In snapdragons, red flower color (R) is incompletely dominant over white flower color (r). The hybrids or heterozygous plants (Rr) are pink in color. a) Show the genotype for a white flower and for a red flower. b) If a red-flowered plant is crossed with a white-flowered plant, what are the genotypes and phenotypes of the F1 generation plants? Show your work. c) What genotypes and phenotypes will be produced in the F2 generation? Show your work? the the o doa A t r th s beirs ard the phenorypic and wo ran aials pring fro d) How did the genotypic and phenotypic ratio compare to each other in this incomplete dominance cross? gonarypi and e) What would the phenotypic ratio have been if this had been complete dominance?
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