Pearson eText Biology: Science for Life -- Instant Access (Pearson+)
6th Edition
ISBN: 9780135214084
Author: Colleen Belk, Virginia Maier
Publisher: PEARSON+
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Chapter 13, Problem 1GFO
Summary Introduction
To investigate:
The basis of segregation of the community with the help of
Introduction:
In biology, segregation can be defined as during the gamete formation, the alleles get parted from each other and each allele pass in an individual gamete. Parting of one allele shows no effect on the other.
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Doing genetic analysis it is determined that two parents are heterozygous for two separate unlinked recessive traits (i.e., both parents are heterozygous for both loci). Given this genetic information, what is the probability of their having a child which is homozygous recessive for both traits?
Forms and Expressions of Alleles
Classify each of the following phenotypes and genotypes using the vocabulary from this lesson.
Phenotype Brown eyes/ Genotype
one dominant brown allele and one
Phenotype Blue eyes/Genotype two
Phenotype Brown eyes/Genotype two
recessive blue alleles
dominant brown alleles
recessive blue allele
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homozygous recessive
homozygous dominant
heterozygous
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Which of the following terms means “many genes”?a. polymorphismb. polygenyc. polypeptided. multiple alleles
Chapter 13 Solutions
Pearson eText Biology: Science for Life -- Instant Access (Pearson+)
Ch. 13 - Define biological species.Ch. 13 - Prob. 2LTBCh. 13 - Prob. 3LTBCh. 13 - Prob. 4LTBCh. 13 - Prob. 5LTBCh. 13 - Prob. 6LTBCh. 13 - The biological definition of race corresponds to...Ch. 13 - All of the following statements support the...Ch. 13 - Similarity in skin color among different human...Ch. 13 - Prob. 10LTB
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- Heterozygote advantage is an interesting condition in those individuals who have one of each allele (dominant and recessive) have a higher survival rate than those individuals who are either homozygous dominant or homozygous recessive. Sickle-cell anemia is such a genetic disease associated with the recessive allele. Normal homozygous individuals (SS) have normal blood cells that are easily infected with the malarial parasite. Thus, many of these individuals become very ill from the parasite and many die. Individuals homozygous for the sickle-cell trait (ss) have red blood cells that readily collapse when deoxygenated. Although malaria cannot grow in these red blood cells, individuals often die because of the genetic defect. However, individuals with the heterozygous condition (Ss) have some sickling of red blood cells, but generally not enough to cause mortality. In addition, malaria cannot survive well within these "partially defective" red blood cells. Thus, heterozygotes tend to…arrow_forwardCystic fibrosis is an autosomal disease that mainly affects the white population, and 1 in 20 whites are heterozygotes. Genetic testing can diagnose heterozygotes. Should a genetic screening program for cystic fibrosis be instituted? Should the federal government fund it? Should the program be voluntary or mandatory, and why?arrow_forwardHi, I'm having some trouble with this practice problem from my study guide. If anyone can explain it it would be very helpful! Brindle coloration is a black and brown striping pattern in some dogs. This fur coloration is controlled by different alleles at a single autosomal locus. There are three alleles, KB, kbr and ky. The KB allele is dominant over the other two alleles and produces a solid black color. The allele kbr produces the brindle color pattern and is dominant over the ky allele, which produces yellow fur. Give the genotypes of the parents and offspring in each cross. P: black X yellow; F1: ½ brindle and ½ black P: black X brindle; F1: ½ black, ¼ brindle and ¼ yellow P: brindle X yellow; F1: 100% brindlearrow_forward
- In pre-DNA fingerprint days, blood type was often used in paternity disputes to exclude possible fathers. If the man in question has type B blood, and the child has type A blood, and the mother has type AB blood, can the man be the father of the child? Group of answer choices Yes, but only if he is homozygous for the B allele No Yes, but only if he is heterozygous for the B allele Yes, but only if both of his parents were Type ABarrow_forwardAnswer the question in the image below please! ..arrow_forwardPeople often say that monozygotic twins are genetically identical. Do you think that is a correct statement? Present arguments for and against this statement.arrow_forward
- What is the definition of homozygous ? having two identical alleles for a gene an organism's appearance or observable traits a variant for a character a heritable unit that determines a characterarrow_forwardThere's more than one correct answersarrow_forwardIn man, there is gradation in eye color and resulting to 9 phenotypes. These are (in order of the number of additive alleles): light blue, medium blue, dark blue, gray, green, hazel, light brown, medium brown, dark brown. Mr. A (dark brown eyes) and Mrs. A’s (light blue eyes) daughter, marries a man whose genotype is the same as herself. What is the probability that they could have: Dark brown eyed child? Hazel-eyed? What eye color is most likely to occur and what is its probability?arrow_forward
- A dominant allele is mutated so that it is no longer functional, resulting in the expression of the recessive phenotype. This is known as: Question 22 options: cancer. the loss of homozygosity. homozygosity. the loss of heterozygosity. heterozygosity.arrow_forwardRecessives Allele, an allele that is fully expressed in the phenotype of a heterozygote. Select one: True Falsearrow_forwardIn people, the trait for colorblindness (Xb) is a recessive sex linked trait and normal vision (XB) is dominant. If a female who is heterozygous for colorblindness has children with a man who has normal vision, what percent of their male children would be expected to be color blind? 0% 50% 100% 25%arrow_forward
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