Scenario: In a species of butterflies, the allele for red wings (R) is dominant over blue wings (r) and the allele for long antennae (T) is dominant over short antennae (t). You cross starting two pure- breeding lineages, one that has red wings and short antennae and the other that has blue wings and long antennae. You then do a test cross of the F1 to determine whether the traits are linked. You collect 10 red-winged butterflies with long antennae, 9 red-winged butterflies with short antennae, 8 blue-winged butterflies with long antennae, and 5 blue-winged butterflies with short antennae. Use a chi-square test to evaluate whether the two traits are unlinked. Report your results by completing the following: • Expected # red wings, long antennae • Expected # blue wings, long antennae · Expected # red wings, short antennae • Expected # blue wings, short antennae Calculate your chi-square value and bring it to class but don't report it here. How many degrees of freedom? Accept or reject the null hypothesis?

Scenario: In a species of butterflies, the allele for red wings (R) is dominant over blue wings (r) and the allele for long antennae (T) is dominant over short antennae (t). You cross starting two pure- breeding lineages, one that has red wings and short antennae and the other that has blue wings and long antennae. You then do a test cross of the F1 to determine whether the traits are linked. You collect 10 red-winged butterflies with long antennae, 9 red-winged butterflies with short antennae, 8 blue-winged butterflies with long antennae, and 5 blue-winged butterflies with short antennae. Use a chi-square test to evaluate whether the two traits are unlinked. Report your results by completing the following: • Expected # red wings, long antennae • Expected # blue wings, long antennae · Expected # red wings, short antennae • Expected # blue wings, short antennae Calculate your chi-square value and bring it to class but don't report it here. How many degrees of freedom? Accept or reject the null hypothesis?

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 4RQ: Imagine that you are performing a cross involving seed color in garden pea plants. What traits would...

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Scenario A In goats, black fur is dominant to red fur. The gene for this trait can be described as Bb (if you forgot why this is so, go back and reread the background information at the beginning of this exercise). A homozygous black female goat (nanny) is crossed with a heterozygous male (billy). What is the genotype of the billy? What is the phenotype of the billy?
Scenario A In goats, black fur is dominant to red fur. The gene for this trait can be described as Bb (if you forgot why this is so, go back and reread the background information at the beginning of this exercise). A homozygous black female goat (nanny) is crossed with a heterozygous male (billy). 5 What is the probability of the goats having a red kid, i.e., what is the proportion of red kids? Record your answer as a percentage What is the probability of the goats having a black kid? Record your answer as a percentage.
A. In corn, yellow kernels (Y) are dominant to white kernels (y). If you cross two plants with the Yy genotype, what percentage of the offspring will have yellow kernels? B.What percentage of the offspring will have the same genotype as the parent plants? C.Say you're also interested in corn plant height where tall plants (T) are dominant to short plants (t). You want to save some time and just cross your plants once. The P1 genotypes are YyTT and YYTt. Will you get any short plants with yellow kernels from this cross? Why or why not? D. If these traits, kernel color and height were linked, how would this affect your experimental outcomes? Would you expect the laws of Mendelian genetics to still apply? Why or why not ?
In certain species of flies, eye color is controlled by sim-·ple dominance by a single pair of alleles. A red-eyed fly was crossed with a white-eyed fly, both of whose parents had white eyes. All of their offspring (both female and male) had red eyes.a. Which is dominant, the allele for red eyesor the allele for white eyes?b. What is the genotype of the white-eyed parents?c. If the white-eyed parent was mated with one of the red-eyed offspring, what phenotypic ratio wouldyou expect regarding eye color?
făctőrs suc 19) The genotype of a black snake is unknown. Black is a dominant allele, so the snake could be either BB or Bb. You cross this snake with a white snake (bb). Which of the following results of that cross would support the unknown genotype of the black snake being a homozygote? A) All F1 offspring are white B) All F1 offspring are black C) Half of the F1 offspring are white, the other half are black D) Three-quarters of the F1 offspring are black, the other quarter are white В x bb the
Let's do one more monohybrid cross. Suppose these is a gene in chickens that controls whether their eggs will be brown or white. Assuming that brown eggs (B) are dominant to white eggs (b), what are all of the phenotypes that would result from a cross between two chickens that are heterozygous for laying brown eggs? To get full credit for this question you will need to:a) List the parental genotypes and phenotypes.b) List the gametes produced by each parent.c) Do a punnet square. You can do this by inserting a 3x3 table. This tool can be found by clicking the waffle shaped icon under the bold "B" on the commands ribbon at the top of your answer box.d) List all of the possible genotype and phenotypes from the cross with numbers.
a. State a hypothesis explaining the inheritance of flower color in painted tongues. b. Assign genotypes to the parents, F₁ progeny, and F2 progeny for all five crosses. c. In a cross between true-breeding yellow and true-breeding lavender plants, all of the F1 progeny are bronze. If you used F₁ plants to produce and F2 generation, what phenotypes in what ratios would you expect? Are there any genotypes that might produce a phenotype that you cannot predict from earlier experiments, and if so, how might this alter the phenotypic ratios among the F2 progeny?
In watermelons, bitter fruit (B) is dominant over sweet fruit (b), andyellow spots (S) are dominant over no spots (s). The genes for these two characteristics assort independently. A homozygous plant that has bitter fruit and yellow spots is crossed with a homozygous plant that has sweet fruit and no spots. The F1 are intercrossed to produce the F2. Q. If an F1 plant is backcrossed with the bitter, yellow-spotted parent, what phenotypes and proportions are expected in the offspring?
In watermelons, bitter fruit (B) is dominant over sweet fruit (b), andyellow spots (S) are dominant over no spots (s). The genes for these two characteristics assort independently. A homozygous plant that has bitter fruit and yellow spots is crossed with a homozygous plant that has sweet fruit and no spots. The F1 are intercrossed to produce the F2. Q. If an F1 plant is backcrossed with the sweet, unspotted parent, what phenotypes and proportions are expected in the offspring?
Give only typing answer with explanation and conclusion to all parts Two true-breeding varieties of maize, one 11 cm high and the other 47 cm high were crossed and the resultant F1 hybrids were then crossed to generate the F2 . In the F2 there were a total of 13,923 plants with a continuous variation in heights between the two extremes and with only 3 plants as large as 47 cm high and 5 plants of 11 cm high. a) How many i) genes and ii) how many alleles are involved in determining height in this plant? b) What is the contribution of each dominant allele to the phenotype in cm?
Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?
Imagine that you are performing a cross involving seed color in garden pea plants. What traits would you expect to observe in the F1 offspring if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green. a. only yellow-green seeds b. only yellow seeds c. 1:1 yellow seeds:green seeds d. 1:3 green seeds:yellow seeds