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 6RQ
Which is one of the seven characteristics that Mendel observed in pea plants?
- flower size
- seed texture
- leaf shape
- stem color
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Which of the following pea plants is heterozygous for height?
Pea Plant Traits
Flower
Flower
Seed Shape
Seed Color
Pod Shape
Pod Color
Plant Size
Color
Location
Round
Yellow
Inflated
Green
Purple
Axial
Tall
R
Y
G P
A
T
Wrinkled
Green
Constricted
Yellow
White
Terminal
Short
(Dwarf)
r
i
a
O T
O Tt
O tt
O Rr
RR
O li
ii
Recessive Traits
Dominant Traits
List the seven characteristics of pea plants that Mendelchose to study
A heterozygous plant with genotype Aa self-pollinates. Find the probability that an offspring is tall for the following genetic systems. Heterozygous plants are tall, and homozygous plants are short.
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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- A heterozygous plant with genotype Aa self-pollinates. Find the probability that an offspring is tall for the following genetic systems. Half of heterozygous plants and one fourth of homozygous plants are tall (it depends on their position in the greenhouse)arrow_forwardA Pea plant with axial flower position, tall stem length, and green seed pod color is cross with another pea plant that has axial flower position, dwarf stem length, and yellow seed pod color. Assume heterozygosity for all dominant trait. Gove 5 kinds of the offspring's genotypes.arrow_forwardA man with red hair (hh) reproduces with a heterozygotic woman (Hh). Does the woman have red hair? What about their children? Create a Punnett square and determine the ratio or percentage of their offspring that have red hair. As stated in the discussion of independent assortment and dihybrids above, pea color and coat texture are independent traits in pea plants. Yellow (G) is dominant over green (g) and smooth (W) is dominant over wrinkled (w). What would the phenotypic ratios of the offspring of parents with genotypes GGww and ggwW? Show your work with a Punnett square. Review the information on Labrador retrievers above. What are the phenotypic ratios of the F1 generation offspring of two dihybrids? Make sure to match the numbers with coat colors (e.g, which number in the ration goes with which color). Use a Punnett square to determine the ratios and show your work. Make sure to state the phenotypic ratios. Finally, what color are the parents? Two other Labradors mate and…arrow_forward
- Use the following information about pea plants: S = spherical seeds; s = wrinkled seeds Y = yellow seeds; y = green seeds P = purple flowers; p = white flowers I = inflated pods; i = constricted pods Write the possible genotypes for the following conditions: Heterozygous for spherical seeds Homozygous for wrinkled seeds Homozygous for spherical seeds and heterozygous for flower colorarrow_forwardA Pea plant with axial flower position, tall stem length, and green seed pod color is cross with another pea plant that has axial flower position, dwarf stem length, and yellow seed pod color. Assume heterozygosity for all dominant trait. What is the genotypic ratio?arrow_forwardA Pea plant with axial flower position, tall stem length, and green seed pod color is cross with another pea plant that has axial flower position, dwarf stem length, and yellow seed pod color. Assume heterozygosity for all dominant trait. What is the phenotypic ratio?arrow_forward
- Crossing Pea Plants: Mendels Study of Single Traits Stem length in pea plants is controlled by a single gene. Consider the cross of a true-breeding long-stemmed variety to a true-breeding short-stemmed variety in which long stems are completely dominant. a. If 120 F1 plants are examined, how many plants are expected to be long stemmed? Short stemmed? b. Assign genotypes to both P1 varieties and to all phenotypes listed in (a). c. A long-stemmed F1 plant is self-crossed. Of 300 F2 plants, how many should be long stemmed? Short stemmed? d. For the F2 plants mentioned in (c), what is the expected genotypic ratio?arrow_forwardMore Crosses with Pea Plants: The Principle of Independent Assortment Consider the following cross: P1: AABBCCDDEE aabbccddee F1: AaBbCcDdEe (self-cross to get F2) What is the chance of getting an AaBBccDdee individual in the F2 generation?arrow_forwardCrossing Pea Plants: Mendels Study of Single Traits Wet ear wax (W) is dominant over dry ear wax (w). a. A 3 : 1 phenotypic ratio of F1 progeny indicates that the parents are of what genotype? b. A 1 : 1 phenotypic ratio of F1 progeny indicates that the parents are of what genotype?arrow_forward
- Green leaves are dominant to red. Long petals are dominant to short. Cross a homozygous green, heterozygous long and a homozygous red, homozygous long. Give phenotypic ratio and show Punnett square.arrow_forwardMendel chose peas as his model organism all the following are reasons for that expect they have short generation times they are easy to grow their male and female gametes are seperated they were rare and thus interesting to studyarrow_forwardA heterozygous plant with genotype Aa self-pollinates. Find the probability that an offspring is tall for the following genetic systems. Only plants that have two A alleles are tall (the allele A is recessive).arrow_forward
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