EBK CONCEPTS OF GENETICS
12th Edition
ISBN: 9780134818979
Author: Killian
Publisher: YUZU
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Chapter 9, Problem 4PDQ
A plant may have green, white, or green-and-white (variegated) leaves on its branches, owing to a mutation in the chloroplast that prevents color from developing. Predict the results of the following crosses:
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List the possible genotypes of the parents if a cross resulted in a F1-generation consisting of 50% white colonies and 50% red colonies:
In corn, male sterility is controlled by maternal cytoplasmic elements. This phenotype renders the male part of corn plants (i.e. the tassel) unable to produce fertile pollen; the female parts, however, remain receptive to pollination by pollen from male-fertile corn plants. However, the presence of a nuclear fertility restorer gene F restores fertility to male-sterile lines.
Using the following color-coded circles, simulate the crosses indicated below. Put the illustrations of crosses in the spaces provided. Be sure to include in the labels the genotypes and phenotypes of the offspring in each cross.
Big light green circle - male-sterile cytoplasm
Big orange circle - male-fertile cytoplasm
Small orange circle - FF nucleus
Small half-light green-half-orange circle - Ff nucleus
Small light-green circle - ff nucleus
In sweet peas, gene C or P alone produces white flowers, the purple colour being due to the presence of both these factors. What will be the flower colour of the offsprings of the following crosses, in which genotypes of parents are given;a) A white flowered plant crossed with a purple produces offspring, of which three-eighth are purple and five-eighth white.
Chapter 9 Solutions
EBK CONCEPTS OF GENETICS
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- A) In these plants, green leaf color is dominant to yellow leaf color. You are given a plant with green leaves and are asked to determine its genotype. What type of cross will you perform? B) The results of this cross are: 50% green leaf plants and 50% yellow leaf plants. What is the genotype of the green leaf plant you were given?arrow_forwardIn the following dihybrid cross: B/b; E/e x B/b; e/e What are the phenotypes of the offspring? 9/16 Black 3/16 brown 4/16 golden 9/16 Brown 3/16 Black 4/16 golden 9/16 Black 3/16 golden 4/16 brown 3/8 Black 1/8 brown 4/8 golden 3/8 golden 4/8 Black 1/8 brownarrow_forwardGreen color in corn plant is controlled by a pair of genes. Give the genotype and phenotype of the offspring from the following crosses:a. GG x Ggb. Gg x Ggc. Explain why no observes a colorless corn plantarrow_forward
- Identify how many genes are associated with the types of crosses: A.) Monohybrid B.) Dihybridarrow_forwardThere are some members of the genus Datura that are trisomic for the chromosome set, which carries the genes for purple (p+) and white (p) flower color. In a cross involving a trisomic p+ p+ p female and pollen from a normal p+ p plant, what is the expected proportion of purple and white flowered individuals?arrow_forwardIndicate the possible genotypes of the following crosses. (Do your own representation, all characteristics first mentioned are dominant) Tall x dwarf Hairy x glabrous Red x white Smooth x wrinkled Yellow x greenarrow_forward
- Consider this cross in pea plants: Tt Rr yy Aa × Tt rr Yy Aa, whereT = tall, t = dwarf, R = round, r = wrinkled, Y = yellow, y = green,A = axial, a = terminal. What is the expected phenotypic outcomeof this cross? Have one group of students solve this problem bymaking one big Punnett square, and have another group solve it bymaking four single-gene Punnett squares and using the multiplication method. Time each other to see who gets done first.arrow_forwardGiven the following information, determine the inheritance of flower color in this plant and determine the genotypes of the parental individuals, which are from pure- breeding lines. CROSS 1 CROSS 2 purple X colorless all purple 9/16 purple colorless X red all purple as in Cross 1 F1 F1 F2 F2 3/16 red 4/16 colorlessarrow_forwardDiagram the P1 and F1 crosses, using Mendelian notation, to show the possible genotypes found in each generation. (Remember a diagram is just the cross itself, not the progeny).arrow_forward
- Cross 1: Purple Stem (P1) x Brown Stem (P2) = F1 Generation (all purple stem plants). Cross 2: F1 x F1 = F2 Generation (295 purple stem plants and 102 brown stem plants). a) What is the phenotype ratio of the F2 generation? b) What is the geneotype ratio of the F2 generation? c) Which trait is dominant?arrow_forwardExplain the Limitations of two-point crossesarrow_forwardGene “A” and gene “B” are not linked. Each has two alleles. The A allele is dominant over the a allele and the B allele is dominant over the b allele. Answer the following questions about a dihybrid (two-trait) cross. A) List all of the possible gametes (eggs) that could be produced by an individual with the genotype: aabb B) List all of the possible gametes (sperm) that could be produced by an individual with the genotype: AaBB C) Fill out a Punnett square for the dihybrid cross cross between the two individuals listed above (aabb x AaBB). What percent of the offspring from this cross would have the dominant phenotype for both traits?arrow_forward
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