Pearson eText Biology: Science for Life with Physiology -- Instant Access (Pearson+)
6th Edition
ISBN: 9780135214114
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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Eyelash length is an inherited trait. In the human population, there is an eyelash length gene. There are two possible variants of this gene-an allele for
long eyelashes (> lcm) and an allele for short eyelashes (1 cm or less). The allele for long eyelashes is dominant (L) and the allele for short eyelashes
is recessive (I). An individual who is heterozygous for eyelash length would have which of the following genotypes?
O LL
OLI
Chapter 13 Solutions
Pearson eText Biology: Science for Life with Physiology -- 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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- Which of the following terms means “many genes”?a. polymorphismb. polygenyc. polypeptided. multiple allelesarrow_forwardHeterozygote 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_forward
- Hi, 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_forwardTo understand this research, you must be familiar with some basic genetic terminology. Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Not all terms will be used. dominant allele phenotype The possession of two different alleles of a particular gene is referred to as Reset Help A variation in a DNA sequence at one particular position is called a heterozygosity genotype recessive allele homozygosity single nucleotide polymorphism The appearance of the organism, its observable traits, are referred to as the A variant of a gene for which an individual must be homozygous in order for it to influence the appearance of the organism is a The set of alleles an organism has for a particular trait is the organism's Submit Request Answerarrow_forwardWhich of these terms is correctly matched with its definition?a. autosome—an X or a Y chromosomeb. phenotype—the genetic makeup of an individualc. allele—variant form of a gene occupying locus on a homologouschromosomed. heterozygous—having two identical genes for a traite. recessive—a trait expressed when the genes are heterozygousarrow_forward
- Answer 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_forwardWhat 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_forward
- There'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_forwardPunnett Square Activity: Directions: You find out that having a thumb that can bend back (e.g. hitchhikers thumb) is a recessive trait in humans. Your female friend Anna, who has a hitchhikers thumb, is about to have a baby with a male partner, Jose, who does not have a hitchhikers thumb, although one of his parents does have hitchhikers thumb. Anna wants to know how likely it will be that her children will have a hitchhikers thumb. Use capital 'H' to represent the dominate allele and lower case 'h' to represent the recessive allele. 1. What are the genotypes of Anna and Jose? a. Anna b. Jose Hitchhiker's thumb No hitchhiker's thumb 2. Fill out the Punnett square below using Anna and Jose's genotypes: Anna's Genotype Jose's Genotypearrow_forward
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