Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 16, Problem 2CQ
Summary Introduction
To identify: The copies of the OCA2 gene that influences eye color in humans.
Introduction: A karyotype helps in the identification of number, form, and size of chromosomes present within an actively dividing cell. Scientists discovered that eukaryotic chromosomes occur in sets by studying the karyotype of various species. The cells are treated with drugs before studying or making a karyotype.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Below are two pictures of perithecium on microscope slides that have been squished under cover slips so that the asci inside have spread
out. In the asci, we can clearly see the tan ascospores (light colored) and wildtype ascospores (dark colored). We will perform our tetrad
analysis by counting how many of the asci are non-recombinant and how many of the acsi are recombinant. We can tell which are
recombinant and non-recombinant by observing the patterns of the ascospores in the asci. See the patterns of ascospores for non-
recombinant and recombinant asci in the table below.
Ascospore pattern of
non-recombinant asci
OOOO
OOOOO
You will count the total number of non-recombinant and recombinant asci in the two pictures below. You will only count the asci that
have a star next to them because these asci can be clearly identified as non-recombinant or recombinant. Select the correct number
below after you are done.
Total number of non-recombinant asci [Select]
Ascospore pattern of…
A blood stain from a crime scene and blood samples from four suspects were analyzed by PCR using fluorescent primers associated with three STR loci: D3S1358, vWA, and FGA. The resulting electrophoretograms are shown below. The numbers beneath each peak identify the allele (upper box) and the height of the peak in relative fluorescence units (lower box). Solve, (a) Since everyone has two copies of each chromosome and therefore, two alleles of each gene, what accounts for the appearance ofonly one allele at some loci? (b) Which suspect is a possible source of the blood? (c) Could the suspect be identifi ed using just one of the three STR loci? (d) What can you conclude about the amount of DNA obtained from Suspect 1 compared to Suspect 4?
Now that you have counted the non-recombinant and recombinant asci we want to determine the recombination frequency between the
tan gene and the centromere. To calculate the recombination frequency we need an accurate count of the number of non-recombinant
recombinant individuals. In the asci the individuals are the ascospores.
and
1118
WWW
4 non-
recombinant
ascospores
4 non-
recombinant
ascospores
1838
W M M M
500
2 non-
recombinant
ascospores
2
recombinant
ascospores
2
recombinant
ascospores
2 non-
recombinant
ascospores
Figure 1.6. The number of ascospores in non-recombinant and recombinant asci.
In the non-recombinant asci all 8 ascospores are non-recombinant (see Figure 1.6 above). In the non-recombinant asci 4 of the
ascospores are recombinant and 4 of the ascospores are non-recombinant (see Figure 1.6 above). To determine how many recombinant
and non-recombinant ascospores where in the two pictures above we need to do the math below. You need to use the total number of…
Chapter 16 Solutions
Biology
Ch. 16.1 - Researchers usually treat cells with drugs that...Ch. 16.1 - Which phases make up interphase?Ch. 16.1 - Prob. 1CSCh. 16.1 - Prob. 1EQCh. 16.1 - The Eukaryotic Cell Cycle CoreSKILL What...Ch. 16.1 - Prob. 3EQCh. 16.2 - Prob. 1CCCh. 16.2 - Mitotic Cell Division Concept Check: What are the...Ch. 16.3 - Core Skill: Modeling The goal of this modeling...Ch. 16.4 - Sexual Reproduction Concept Check: What is the...
Ch. 16.5 - Variation in Chromosome Structure and Number...Ch. 16 - Prob. 1TYCh. 16 - Prob. 2TYCh. 16 - Prob. 3TYCh. 16 - Prob. 4TYCh. 16 - Prob. 5TYCh. 16 - Which of the following is not an event of anaphase...Ch. 16 - Prob. 7TYCh. 16 - Which of the following statements accurately...Ch. 16 - Prob. 9TYCh. 16 - Aneuploidy may be the result of a. duplication of...Ch. 16 - Prob. 1CQCh. 16 - Prob. 2CQCh. 16 - Prob. 3CQCh. 16 - Prob. 1COQCh. 16 - A diploid eukaryotic cell has 10 chromosomes (5...
Knowledge Booster
Learn more about
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 an electrophoretic gel across which is applied a powerful electrical alternating pulsed field, the DNA of the haploid fungus Neurospora crassa (n = 7) moves slowly but eventually forms seven bands, which represent DNA fractions that are of different sizes and hence have moved at different speeds. These bands are presumed to be the seven chromosomes. How would you show which band corresponds to which chromosome?arrow_forward2 3 4 5 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 ху Which chromosome set has an extra What diagnosis would you give this patient?. Finish the notation for this patient's karyotype: What causes a dark band on the chromosome? What is a centromere?arrow_forwardARVC5 is a disorder characterized by the replacement of healthy heart tissue with fatty fibrous tissue. Recent research has discovered the mutated gene that causes the disorder is on chromosome 3. People who have the mutation have a GCG triplet instead of the normal ACA triplet. The following is a section of a gene on chromosome 3: GGT GCG ACA ATT 1. Complete the following table. AA DNA sense strand DNA antisense strand GGT GCG ACA ATT mRNA tRNA 2. Indicate the change in the amino acid sequence resulting from the mutation in the gene described above., B I 123 ||| 14 E GO LG US X₂ x²arrow_forward
- Figure 1. Showing a homologous pair of chromosomes that carry two linked genes. Here we can see that one chromosome carries A and Balleles, while the other homologous chromosome carries a and b alleles. This is much more informative than just giving the genotype of AaBb. Another way to symbolize the arrangement of alleles on a chromosome is to give the symbols for alleles on one chromosome above a horizontal line, and the symbols for the alleles on the homologous chromosome below the horizontal line. For example: A Figure 2. Showing the arrangement of alleles for a pair of linked genes. Here we can see that, exactly like the example in Figure 1, one chromosome carries A and B alleles, while the other chromosome carries a and b alleles. 1. Suppose that Gene G and Gene D are linked. If the genotype of an organism is GGDD, use both types of symbols you learned in Figure 1 and Figure 2 above to show the arrangement of alleles for this organism.arrow_forwardAn STR on chromosome 5 is very closely linked to a gene involved in a dominant metabolism disorder (one one copy of the mutation causes the disease). There are four different alleles of the STR (Q, B, S, and L), each with different numbers of GATCTCG repeats. The S allele has 2 repeats, the B allele has 7 repeats, the Q allele has 10 repeats, and the L allele has 5 repeats. Part 1 Lane 1 of the gel shown below indicates the locations of PCR products corresponding to all four STR alleles when run together in one lane. DNA was loaded into the wells at the top of the gel. Move the letter of each allele to its correct position at the left of Lane 1 to indicate where each allele runs on the gel. 0000 Gabriel Andre Lane 1 O Maria Andre Maria Juliana B L Part 2 Andre and Maria are the parents in this family; all others shown on the gel are children. Daughter Juliana is born with the metabolism disorder, but daughter Camila does not have the disorder. Assuming no recombination between the STR…arrow_forwardReferring to Figure 17-26, draw the product if breaks occurred within genes A and Barrow_forward
- Identify the chromosomes in the spread based on their size and banding pattern. Arrange them as shown in the organized picture. I have this image that I have no idea how to start! I get what I'm looking at but I'm having trouble determine if my order is right! Please help me. I've attached the spread of the chromosomes and an example of how they should look.arrow_forwardThe picture shows a gel of PCR products for the loci SRY, AMELX/Y and ZFX/Y, for three controls and five test human individuals (1-5). Below the gel is the phenotypic sex of each individual, their fertility status, and the number of Barr bodies seen in the nucleus of a somatic cell in each case. The diagram to the right shows the positions of the tested loci on the human sex chromosomes, and also the positions of the PRKX and PRKYgenes. Which sample carries a derived X chromosome with a translocation due to ectopic crossover between the loci PRKX and PRKY: 46,X,derX,t(X,Y); ? 1 2 3 4 5arrow_forwardThe white spots in this image represent Barr Bodies. The cells are from a Male cell line. What is the sex chromosome complement of this cell line?arrow_forward
- What sequence is shown in Figure 1? Label all 5' and 3' ends.arrow_forwardWhy is chromosome 21 the smallest and not chromosome 22? considering that a karyogram is arranged from largest to smallestarrow_forwardIn Figure 5-38, precisely which gene is eventually identified from the genome sequence?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Genome Annotation, Sequence Conventions and Reading Frames; Author: Loren Launen;https://www.youtube.com/watch?v=MWvYgGyqVys;License: Standard Youtube License