Suppose that you have 72 F2 flies from a cross, and expected that they would show a phenotype ratio of: 9 red eye/normal wings : 3 red eye/dumpy wings : 3 eyeless/normal wings : 1 eyeless/dumpy wings How many flies that eyeless with normal wings would you

Suppose that you have 72 F2 flies from a cross, and expected that they would show a phenotype ratio of: 9 red eye/normal wings : 3 red eye/dumpy wings : 3 eyeless/normal wings : 1 eyeless/dumpy wings How many flies that eyeless with normal wings would you

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Description: Suppose that you have 72 F2 flies from a cross, and expected that they would show a phenotype ratio of:9 red eye/normal wings : 3 red eye/dumpy wings : 3 eyeless/normal wings : 1 eyeless/dumpy wingsHow many flies that eyeless with normal wings would

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 5RQ: Imagine that you are performing a cross involving seed texture in garden pea plants. You cross...

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You cross a true-breeding yellow-bodied, smooth-winged female fly with a true-breeding red-bodied, crinkle-winged male. The red body phenotype is dominant to the yellow body phenotype and smooth wings are dominant to crinkled wings. Use B or b for body color alleles, and W or w for wing surface alleles.(4 points) a) What are the genotypes of the P generation flies? b) What will be the genotype(s) and phenotype(s) of the F1 offspring? c) You discover that the genes for body color and wing surface are linked. You perform a dihybrid test cross between the F1 flies from part (b) with a true-breeding yellow-bodied, crinkle-winged fly. Use the following results of this cross to determine the recombination frequency (%) between the body color and wing surface genes. (Remember that the recombinants are the ones that do not resemble the parental types from the P generation.) Body Color Wing Surface # of Individuals red smooth 102 yellow smooth 404 red crinkled 396 yellow crinkled…
Lucas conducted a dihybrid cross in his genetics experiment. He observed 315 flies with gray body and long wings, 108 flies with gray body and miniature wings, 101 flies with ebony body and long wings, and 32 flies with ebony body and miniature wings. Analyse these data using test to see if (i) they fit a 9:3:3:1 ratio. (ii) the gray : ebony data fit a 3:1 ratio. Table 1: Chi-square table Chi Square Values and Probability Degrees of Freedom P = 0.99 0.95 0.80 0.50 0.20 0.05 0.01 0.000157 0.00393 0.0642 0.455 1.642 3.841 6.635 2 0.020 0.103 0.446 1.386 3.219 5.991 9.210 0.115 0.352 1.005 2.366 4.642 7.815 11.345 4. 0.297 0.711 1.649 3.357 5.989 9.488 13.277
A male fly that is homozygous for both red eyes (A) and normal wings (B) mates with a female fly that has apricot (a) eyes and pointed wings (b). Both traits are controlled by autosomal alleles. Using the information provided above, answer the following two questions (Question 1 AND 2): What is the expected phenotype for the flies in the F1 generation? What is the expected genotype for the flies in the F1 generation?
In the video game Animal Crossing: New Horizons, flowering breeding is based in genetics. Each flower's color is determined by the genotype at three or four unlinked genes: R, Y, W, and S. The genotype of the elusive blue rose is RR YY ww ss. In the game, one way to get a blue rose is to cross two roses with the Rr Yy Ww ss genotype. A) What types of gametes and in what proportions will a Rr Yy Ww ss rose produce? B) In a cross Rr Yy Ww ss x Rr Yy Ww ss what are the possible offspring genotypes and at what frequency will they each appear? Show your work. C) What proportion of the offspring of the cross will be blue roses?
In tomatoes, the red fruit color is completely dominant to yellow. Suppose a tomato plant homozygous for red is crossed with one homozygous for yellow and the progeny are allowed to self pollinate. What phenotypes do you predict in the F2 generation? a) 3 red: 1 yellow b) 9 red : 3 orange : 1 yellow c) 1 red : 2 orange : 1 yellow d) 1 red : 1 yellow
Females from a pure-breeding curly-winged strain are mated with males from a pure-breeding straight-winged (wild-type) strain. The F1 mate with each other to produce an F2 generation that consists of 160 flies with curly wings and 80 with straight wings. What can you infer from this observation? Explain your answer and why the other options do not qualify, A) Curly wings is a recessive trait. B) The dominant curly wing allele is also a recessive lethal. C) Wing shape is controlled by two codominant alleles. D) Two interacting genes determine wing shape. E) All of the hybrid F 1 flies had straight wings.
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You are trying to establish true breeding colonies of snails that are Dextral and Sinistral, and you have one female whose genotype you do not know. If you observe Sinistral phenotypes in the F1 offspring: please answer both questions A and B. A. Can you determine her genotype (and what is it if so)? B. Can you determine her phenotype (and what is it if so)?|
Assume that a cross is made between a heterozygous tall pea plant and a homozygous short pea plant. Fifty offspring are produced in the following frequency: 32 = tall; 18 = short (a) What frequency of tall and short plants is expected? (b) Compute a Chi-square value associated with the appropriate test of significance. (c) How should this result be interpreted regarding the null hypothesis?