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 14RQ
In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotypic ratio (homozygous dominant: heterozygous:homozygous recessive) would you expect to observe in the offspring?
a. 1:2:1
b. 3:1:1
c. 1:2:0
d. 0:2:1
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In mating between two individuals that are heterozygous for a recessive allele, what genotypic ratio would you expect in the offspring?
homozygous dominant: heterozygous: homozygous recessive?
A. 1:2:1
B. 3:1:1
C. 1:2:0
D. 0:2:1
E. 1:4:2
In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and
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a. 2:1 male to female
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Achondroplasia is a form of dwarfism caused by a mutation in a single gene. Two individuals with achondroplasia marry and have an affected child and later have a second child that is average in height.From this you can conclude
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a. achondroplasia is a result of codominance
b. achondroplasia is produced by a recessive allele
c. achondroplasia is a result of incomplete dominance
d. achondroplasia is produced by a dominant allele
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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- Match the pattern of inheritance to the appropriate term. A. Heterozygotes with different alleles of the DTL1 gene survive better than homozygotes B. The disease is usually passed from a mother to all children C. Pure-breeding pumpkin plants grown on sandy soil have bigger seeds than plants of the same pure-breeding lineage grown on peaty soil. D. A cross between a true-breeding plant with serrated leaf edges and a true- breeding plant with smooth leaf edges produces an F1 generation with 88% plants with serrated leaves. E. A cross between two heterozygotes, DdFf, produces offspring in three phenotypic groups; Long wings in offspring with genotype D_F_, short wings in offspring with D_ff, and no wings in offspring with the genotypes ddF_ and ddff. F. Individuals homozygous for a mutation in SME have a heightened sense of smell and large earlobes. G. Grey chickens bred together have offspring that are black, grey and white in a 1:2:1 ratio H.Alleles at locus S…arrow_forwardAlleles that show incomplete dominance will represent: Choose oneAnswer: A . heterozygotes that have a phenotype intermediate between the dominant and recessive alleles. B. homozygotes that have a genotype like the recessive allele C. homozygotes that have a phenotype intermediate between the dominant and recessive alleles. D. heterozygotes that have a genotype like the dominant allelearrow_forwardIn humans, potential or expecting parents can be tested for the presence of the allele for the autosomal recessive cystic fibrosis. Which combination of parents are LEAST likely to produce a child with cystic fibrosis? A. 2 parents with cystic fibrosis B. 2 parents without cystic fibrosis C. 1 parent without cystic fibrosis and 1 with cystic fibrosis D. 2 parents who do not know if they have cystic fibrosisarrow_forward
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