Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 12, Problem 9RQ
A scientist pollinates a true-breeding pea plant with violet, terminal flowers with pollen from a true- breeding pea plant with white, axial flowers. Which of the following observations would most accurately describe the F2 generation?
- 75% violet flowers; 75% terminal flowers
- 75% white flowers in a terminal position
- 75% violet flowers; 75% axial flowers
- 75% violet flowers in an axial position
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Students have asked these similar questions
Suppose that 100 pollen grains land on a stigma, and 50 mature seeds are formed in the fruit. What does this indicate about the pollination process and success?
A) 100% success: 100 pollen grains grew to 50 ovules, two to each, and double fertilization occurred.
B) 100% success: Only 50% of the pollen grains germinated, but each produced 2 sperms to complete double fertilization in 50 seeds.
C) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 50 polar nuclei.
D) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 100 polar nuclei.
correct answer and explanation why please.
Monoecious plants such as corn have either staminate or carpelate flowers. Knowing what you do about the molecular mechanisms of floral development, which of the following might explain the development of single-sex flowers?
a. Expression of B-type genes in the presumptive carpel whorl will generate staminate flowers.
b. Loss of A-type genes in the presumptive petal whorl will allow C-type and B-type genes to produce stamens instead of petals in that whorl.
c. Restricting B-type gene expression to the presumptive petal whorl will generate carpelate flowers.
d. All of the choices are correct.
list all gamets that could be made by a pea plant heterozygous for seed colour, seed shape and pod shape(Yy, Rr, Ii) what size punnett square would you need to determine offspring of self pollination of this hybrid
Chapter 12 Solutions
Biology 2e
Ch. 12 - Figure 12.5 In pea plants, round peas (R) are...Ch. 12 - Figure 12.6 What are the genotypes of the...Ch. 12 - Figure 12.12 What ratio of offspring would result...Ch. 12 - Figure 12.16 In pea plants, purple flowers (P) are...Ch. 12 - Mendel performed hybridizations by transferring...Ch. 12 - Which is one of the seven characteristics that...Ch. 12 - Imagine you are performing a cross involving seed...Ch. 12 - Consider a cross to investigate the pea pod...Ch. 12 - A scientist pollinates a true-breeding pea plant...Ch. 12 - The observable traits expressed by an organism are...
Ch. 12 - A recessive trait will be observed in individuals...Ch. 12 - If black and white true-breeding mice are mated...Ch. 12 - The ABO blood groups in humans are expressed as...Ch. 12 - In a mating between two individuals that are...Ch. 12 - If the allele encoding polydactyly (six fingers)...Ch. 12 - A farmer raises black and white chickens. To his...Ch. 12 - Assuming no gene linkage, in a dihybrid cross of...Ch. 12 - The forked line and probability methods make use...Ch. 12 - How many different offspring genotypes are...Ch. 12 - Labrador retriever's fur color is controlled by...Ch. 12 - Which of the following situations does not follow...Ch. 12 - Describe one of the reasons why the garden pea was...Ch. 12 - How would you perform a reciprocal cross for the...Ch. 12 - Mendel performs a cross using a true-breeding pea...Ch. 12 - Calculate the probability of selecting a heart or...Ch. 12 - The gene for flower position in pea plants exists...Ch. 12 - Use a Punnett square to predict the offspring in a...Ch. 12 - Can a human male be a carrier of red-green color...Ch. 12 - Why is it more efficient to perform a test cross...Ch. 12 - Use the probability method to calculate the...Ch. 12 - Explain epistatis in terms of its Greek-language...Ch. 12 - In Section 12.3, ''Laws of Inheritance," an...Ch. 12 - People with trisomy 21 develop Down’s syndrome....Ch. 12 - A heterozygous pea plant produces violet flowers...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- What is the difference between self-pollination and cross-pollination? If pollen is transferred from the stamens of a flower to the stigma of the very same flower, is that cross-pollination or self-pollination? If it is transferredfrom the stamen of one flower to the stigma of another flower on the very same plant? If it is transferred from the stamen of one flower to the stigma of another flower on a different plant, but a plant that is a clone of the first one? Animals do not have pollen, of course, but why is it that most animals never have to worry about the equivalent problem of self-fertilization? Why cannot most animals fertilize themselves?arrow_forwardPurple Stem A All seedlings are 72 hours old. Standard Height R seed coat Green Stem a Purple Stem Standard Non-Purple Stem Standard (anl/anl, ROS/ROS) Purple Stem Rosette-Dwarf Non-Purple Stem Rosette-Dwarf Dwarf Height r (ANLIANL, ROS/ROS) (ANLIANL, ros/ros) (anl/anl, ros/ros) Cross a heterozygous (for color only!) purple stem standard (homozygous for height) with a green stem dwarf. What are the parental genotypes? What % is each phenotype in the offspring?arrow_forwardA Heterozygous plant, GgHhliJjKk is allowed to self-fertilize. What is the probability that an offspring will be GgHHliJjKk?arrow_forward
- In the left-hand part of Figure 2-4, the red arrows showselfing as pollination within single flowers of one F1plant. Would the same F2 results be produced by crosspollinating two different F1 plants?arrow_forwardYou are planting a cherry orchard with two rows of female fruiting trees. Below is a diagram of their location, and three empty plots where you could plant male pollen trees. Left Plot S₁S₁ Left S₁ S₂ Middle Middle Plot S₁S3 Middle S₂S3 S₂S3 S₂S3 Based on the S genotype of the above female trees, where would you place male pollen trees with the following genotypes to maximise fertilisation? S₂S₂ Middle S₂S3 Right to S3 S3 Middle = S₁S₁ S₁S₁ S₁S₁ Right Plotarrow_forwardA) Describe the data you collect from the Purple 1 x Purple 2 cross. Predict the genotype of each of the parent plants. Explain your predictions using data from the experiment. B) Consider the offspring, the next generation (F1), from the Purple 1 x Purple 2 cross. What is the probability of a green stem plant? How do you know this? C) What is the probability in the F2 generation of a green stem offspring? Use a Punnett square(s) and quantitative data to explain your thinking. Upload your Punnett square(s).arrow_forward
- The physical and purposeful process of crossing the pollen of one plant to the stigma of another plant is known as cross pollination or A self pollination artificial fertilization cross fertilizationarrow_forwardThe drooping, bell-like flower Aquilegia canadensis is adapted for cross-pollination. However, if the plant has not been pollinated previously, self-pollination can occur. However, if cross pollination occurs after self-pollination takes place, the pollen from cross pollination reaches the style before the pollen from self-pollination. Using course concepts and vocabulary 1) Provide a reasoning for this phenomenon. 2) Would this adaptation for reproduction be beneficial for the plant?arrow_forwardYou are a developmental geneticist and perform a mutagenesis screen in Arabidopsis looking for floral organ mutants. You identify a mutant phenotype that has the following organ arrangement, beginning in whorl 1: Sepal-Sepal-Carpel-Carpel Which class of floral identity genes has been mutated? A-B double mutant O A O SEPALLATA B сarrow_forward
- Y = yellow, y = green; R = round seed, r = wrinkled seed Dihybrid cross: If you mate YyRr x YyRr then what proportion of offspring will be green and wrinkled? 6/16 3/16 O 1/16 O 9/16arrow_forwardRound seed is dominant over wrinkled. Yellow cotyledon is dominant overgreen. Full pod is dominant over constricted. The genes for these traits arefound on separate chromosomes. If a trihybrid plant is self-fertilized, whatproportion of the progeny will have round seeds in constricted pods?Express answer in fraction form.arrow_forwardUnder which of the following conditions would pollen from an S2S5 plant successfully pollinate an S1S5 flower? a. Using pollen from a carpelate flower to fertilize a staminate flower would be successful. b. If the plants used gametophytic self-incompatibility, half of the pollen would be successful. c. If the plants used sporophytic self-incompatibility, half of the pollen would be successful. d. Pollen from an S2S5 plant can never pollinate an S1S5 flower.arrow_forward
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