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 23CTQ
How would you perform a reciprocal cross for the characteristic of stem height in the garden pea?
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Given 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 colorless
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.
In a cross between a 29cm plant and a 20cm plant what would be the genotypes giving the smallest number of different phenotypes? specify the phenotypes observed.
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
- A parent pea plant with the genotype Ttrr produces offspring in which half are tal and round and half are short and round. What’s the genotype of the other parent?arrow_forwardConsider this four-factor cross: 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 probability that the first three plantswill have round seeds? What is the easiest way to solve this problem?arrow_forwardTall plant (D) is dominant to dwaf (d), and purple flower color (W) is dominant to white flower color (w). In order to determine the genotype of a tall plant with purple flowers, you decide to conduct a test cross. What should be the genotype of the plant you use to carry out the test cross?arrow_forward
- There 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_forwardIn certain plants, tall (T) is dominant to short (t). If a heterozygous plant is crossed with a homozygous short plant, what is the probability that the offspring will be short? Show the punnett square please.arrow_forwardIf an incompletely dominant red-flowered plant is crossed with an incompletely dominant white-flowered plant, what are the genotypes and phenotypes of the plant F1 generation? What genotypes and phenotypes will be produced in the F2 generation?arrow_forward
- What are the expected progeny (genotypes and phenotypes) from a cross of an AA plant with an Aa plant?arrow_forwardIn a test cross, peas of an unknown genotype are crossed with peas of a known genotype. In this example, smooth peas are the unknown and wrinkled peas are the known (rr). If half of the offspring from that cross are smooth and half are wrinkled, what is the genotype of the unknown plant?arrow_forwardWhat two essential criteria must be met in order to execute a successful mapping cross?arrow_forward
- In a cross between a 29cm plant and a 20cm plant what would be the genotypes giving the smallest number of different phenotypes? specify the phenotypes observed. (6 genes and 12 alleles involved)arrow_forwardA tall pea plant with axial flowers was crossed to a dwarf plantwith terminal flowers. Tallness and axial flowers are dominanttraits. The following offspring were obtained: 27 tall, axial flowers;23 tall, terminal flowers; 28 dwarf, axial flowers; and 25 dwarf,terminal flowers. What are the genotypes of the parents?arrow_forwardIn Mendelfruit plants, fruit may be either round (RR), long (rr) or oval (Rr). Cross two oval-fruit plants. What is the phenotypic ratio of the resulting offspring? (what do they LOOK LIKE?) Cross a round-fruit plant and an oval-fruit plant. Give the phenotypic ratio of the offspring.arrow_forward
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