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
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
Two pure-breeding lines of petunia plants are crossed. Line 1 plants grow to a height of 54
cm, and Line 2 plants grow to a height of 18 cm. Petunia plant height is controlled by three
genes, A, B and C. Line 1 has the genotype A₁A₁B₁B₁C₁C₁, and line 2 has the genotype
A2A2B₂B₂C₂C₂. Assume that genotype alone determines plant height under ideal growth
conditions and that the alleles of the three genes are additive.
If the F1 plants are self crossed, what is the expected proportion of F2 plants with the
genotype A₁A₁B₁B₁C₁C₁
1/8
1/32
1/16
1/4
1/64
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?)
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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