Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 12, Problem 12TYK
Summary Introduction
To review:
The number of genes that control pod color. The letter designation for genes and finding the dominant allele.
Introduction:
When homozygous parents with dominant and recessive traits are crossed, they produce F1 progeny in the ratio 3:1, which means that out of four offspring, 3 are dominant and 1 is recessive. The dominant genes are denoted by capital letters and recessive genes are denoted by small letters.
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Students have asked these similar questions
Sunflowers with flowers 10 cm in diameter are crossed with a plant that has 16 cm flowers. The F1 plants have flowers 13 cm in diameter. In the F2 generation, 4 flowers are 10 cm in diameter and 4 are 16 cm in diameter. Between these are 5 phenotypic classes with diameters intermediate to those at the extremes.a) Assuming that the alleles that contribute to flower diameter act additively, how many genes control flower size?
b) How much does each additive allele contribute to flower diameter?(show work)
c) What size flower makes up the largest phenotypic class?(show work)
Sunflowers with flowers 10 cm in diameter are crossed with a plant that has 16 cm flowers. The F1 plants have flowers 13 cm in diameter. In the F2 generation, 4 flowers are 10 cm in diameter and 4 are 16 cm in diameter. Between these are 5 phenotypic classes with diameters intermediate to those at the extremes.a) Assuming that the alleles that contribute to flower diameter act additively, how many genes control flower size?
b) How much does each additive allele contribute to flower diameter?
c) What size flower makes up the largest phenotypic class?
A homozygous variety of opium poppy (Papaver somniferum Laciniatum) with lacerate leaves was crossed with another
homozygous variety with normal leaves. All the F₁ had lacerate leaves (jagged-edged leaves). Two F₁ plants were crossed to
produce the F2. Of the F2, 249 had lacerate leaves and 16 had normal leaves.
How are lacerate leaves determined in the opium poppy?
two genes, with a dominant allele at both loci
two genes, where one allele at a single locus is recessive lethal
one gene, with codominant alleles at a single locus
two genes, with a dominant allele at either or both loci
Give genotypes for all the plants in the P, F₁, and F2 generations. Some generations will have more than one genotype.
P
F₁
F₂ (lacerate)
F₂ (normal)
aabb
A_B_
Answer Bank
aaB
AaBb
A_bb
AABB
Chapter 12 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 12.1 - Two pairs of traits are segregating in a cross....Ch. 12.1 - If, instead, the four phenotypes in question 1...Ch. 12.2 - Palomino horses have a golden coat color, with a...Ch. 12.2 - A true-breeding rabbit with agouti (mottled,...Ch. 12 - The dominant C allele of a gene that controls...Ch. 12 - In peas, the allele Le produces tall plants and...Ch. 12 - Prob. 3TYKCh. 12 - What genotypes, and in what frequencies, will be...Ch. 12 - In addition to the two genes in problem 4, assume...Ch. 12 - Prob. 6TYK
Ch. 12 - In cats, the genotype AA produces tabby fur color;...Ch. 12 - Prob. 8TYKCh. 12 - The ability of humans to taste the bitter chemical...Ch. 12 - A man is homozygous dominant for alleles at 10...Ch. 12 - In guinea pigs, an allele for rough fur (R) is...Ch. 12 - Prob. 12TYKCh. 12 - Some recessive alleles have such a detrimental...Ch. 12 - In chickens, feathered legs are produced by a...Ch. 12 - A mix-up in a hospital ward caused a mother with O...Ch. 12 - Having malformed hands with shortened fingers is a...Ch. 12 - Prob. 17TYKCh. 12 - Design an Experiment Imagine that you are a...Ch. 12 - Prob. 19TYKCh. 12 - Prob. 1ITDCh. 12 - Prob. 2ITDCh. 12 - Half of the worlds population eats rice at least...
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- A variety of opium poppy with lacerate leaves was crossed with a variety that has normal leaves. All the F1 plants had lacerate leaves. Two F1 plants were then interbred to produce the F2. Of the F2 plants, 249 had lacerate leaves and 16 had normal leaves. What are the genotypes of the plants in the P (parental), F1, and F2 generations? How are lacerate leaves determined in the opium poppy? Note: You can use the symbols A and B to represent the two genes involved. (How do we know there are two?)arrow_forwardTwo true breeding pea plants-one with yellow round seeds (YYRR) and the other with green wrinkled seeds (yyrr)-were crossed. The F1 plants will be dihybrid heterozygous for both the characters (yyRr). The plants were self-pollinated. Will the Y and R alleles always stay together, generation after generation? Or are seed color and seed shape inherited independently of each other? Show how you come to a conclusion.arrow_forwardIn cucumbers, speckled fruit color (u') is dominant to uniform fruit color (u), and large spines (ss") are dominant to small spines (ss). These two genes are linked at a map distance of 20.4 m.u. A true-breeding cucumber plant with speckled fruit and large spines is crossed with a true-breeding plant with uniform fruit color and small spines. One of the F1 plants is crossed with a plant with uniform fruit color and small spines. What percentage of the offspring of this cross are expected to have uniform fruit color and small spines? 39.8% 10.2% 79.6% 20.4%arrow_forward
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