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
females are ZW. A recessive lethal allele that causes death of the embryo is
sometimes present on the Z chromosome in pigeons. What would be the sex
ratio in the surviving offspring of a cross between a male that is heterozygous
for the lethal allele and a normal female?
a. 2:1 male to female
b. 1:2 male to female
c. 1:1 male to female
d. 4:3 male to female
e. 3:1 male to female
Blue eyes and a straight hairline are both recessive alleles for two different genes. The dominant phenotypes of the two different genes are brown eyes and a widow’s peak.
a male with blue eyes and a widow’s peak, and a female with brown eyes and a straight hairline, have a child What is the probability will have blue eyes and a straight hairline?
A. 1/2
B. 1/4
C. 1/8
D. 1/16
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
- In garden peas, the texture of the seed coat and the size of the pea plant are two traits determined by separate genes. Smooth seed coat tall plant size (T) is dominant to dwarf size (t). What is the ratio of phenotypes would expect to see in the offspring of a cross between plant that is heterozygous for both traits? a. 3:1 b. 1:1:1:1 c. 1:1arrow_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_forwardPolydactyly is a congenital physical anomaly in in humans, dogs, cats; and having supernumerary fingers or toes. If it is an autosomal dominant trait, when is a genotype of a person that shows normal phenotype? a. heterozygous recessive b. heterozygous dominant c. homozygous recessive d. homozygous dominantarrow_forward
- If blonde hair color is a recessive trait and one parent is heterozygous for the trait and the other parent is heterozygous for the trait, what are the chances that their offspring will have blonde hair?A. 25% (one in four)B 50% (two in four)C. 75% (three in four)D. 100% (four in four) Provide explanation or solutionarrow_forwardWhat is the phenotypic ratio of the offspring when a man who has type A blood, and whose mother had type O blood, marries a woman who has type AB blood? a 2 type A : 1 type AB : 1 type B b 3 type A: 1 type B c 1 type A : 1 type O d 1AA :1AB : 1AO : 1BOarrow_forwardThe snapdragon flower in Tennessee and Alabama are both white. When these two strains of snapdragon were crossed, the resulting F1 produces purple-color flower. When the F1 was self-crossed, the F2 progeny were 540 purple and 420 white. 16. What kind of inheritance pattern is this? A. recessive epistasis B. complete dominance C. dominant epistasis D. codominance E. complementationarrow_forward
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