In C. elegans, lon-2 and unc-2 are recessive mutations that are 8 map units apart on the X chromosome.  An hermaphrodite who is Lon and Unc is mated to a wild-type male.  An F1 hermaphrodite is mated to a wild-type male.  What are the expected percentages of the different phenotypes among the male progeny?

Q: One of the X chromosomes in a particular Drosophila female had a normal order of genes but carried…

A: Crossing over: It occurs during prophase I and involves the exchange of genetic material between…

Q: The picture below represents a G1 cell from a newly discovered species that uses the X/Y sex…

A: The cell is in G1 phase and hence it undergoes the S phase to duplicate the DNA. Thus, homologous…

Q: For the following chromosome complements, what is the phenotypic sex of a person who has Q. XXYY…

A: The male-determining gene in humans is termed as the sex determining region Y (SRY) gene. Generally…

Q: A certain species of animal has 18 chromosomes in its diploid cells (2n=18). Describe what the…

A: Introduction Strasburger 1875 first reported the presence of chromosomes in eukaryotic cells. The…

Q: An individual  heterozygous for a reciprocal translocation possesses the following chromosomes:  A B…

A: Translocation is caused by the separation of a chromosome segment and its union with a…

Q: What is the number of sex chromosomes in male honey bees?

A: Introduction  A sex chromosome is a chromosome that is variable in form, size, and function from an…

Q: diploid individual is heterozygous for a chromosome rearrangement. The original chromosome and its…

A: Meiosis ensures the production of haploid phase in the life cycle of sexually reproducing organisms…

Q: Imagine a germ cell for an animal that is 2n=4. Gene A and B are found on chromosome one, and the…

A: Meiosis is the cell division process that is responsible for the production of four haploid (n)…

Q: In general, why do changes in chromosome structure or numbertend to affect an individual’s…

A: Chromosome is a compact structure of a DNA molecule wrapped around some proteins. It is generally…

Q: In the following schematic drawing of a Holliday junction,one chromatid is shown in red, and the…

A: a) Cuts should occur at positions 2 and 4 to get recombinants. A Holliday model can be resolved in…

Q: Table 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a…

A: Chromosomal deletion syndrome occurs when whole or part of chromosomes are missing. Turner Syndrome…

Q: A phenotypically abnormal individual has a phenotypically normalfather with an inversion on one copy…

A:

Q: What gametes, and in what frequencies, are produced by a female Drosophila of genotype A B / a b…

A: Drosophila, sometimes known as fruit flies, has been used as a model organism in genetic study for…

Q: Bow-legs is hypothesized to be X-linked recessive trait in Drosophila melanogaster. The P1 virgin…

A: Introduction :- When the test statistic is chi-squared distributed under the null hypothesis, a…

Q: A color-blind woman with Turner syndrome (XO) has a father who is color blind. Given that the gene…

A: Given that the gene for the color-blind condition is recessive and X-linked and a color-blind woman…

Q: The wingless fruit fly phenotype (unable to grow wings) is recessive to normal wing growth. A…

A: The wingless male fruit fly is crossed with a wingless female fruit fly and the progeny produced by…

Q: Draw a Punnett square for the dihybrid cross. There are two known alleles of gene occupying a…

A: Dihybrid cross involves two genes in a cross. That's why the two traits are involved in this cross.

Q: A reciprocal translocation between chromosome 1 and 2 in Drosophila resulted in AB//CPQR and…

A: After reciprocal translocation, Chromosome 1 - AB//CPQR Chromosome 2 - MN//ODEF

Q: Please show the process of meiosis through Prophase 2

A: 1. Meiosis I:   - Prophase I: Homologous chromosomes pair up, and cross-over occurs between…

Q: What is inversion heterozygotes ?

A: Heterozygote can be defined as the genes that are  for the specific trait are considered to be…

Q: How many Barr bodies in a person with genotype XXXXX? How is the structure of a Barr body different…

A: The mammalian males contain XY chromosome and females contain XX chromosome. So, the number of…

Q: A woman with a balanced reciprocal translocation of Chromosomes 4 and 20 (karyotype, right panel…

A: In a balanced reciprocal translocation genetic material is exchanged between two chromosomes with no…

Q: In fruit flies a dominant mutation on the X chromosome causes the eye to be oval instead of round.…

A: Introduction :  Gene is a unit of heredity. It contains the genetic information. It is made up of…

Q: what is the significance of chromosomal aberration? what are the different types of chromosomal…

A: Chromosome contains the genetic information of the organism.

Q: Shown below is a karyotype from a human being. How many total autosomes does this individual have?…

A: A chromosome is a long DNA molecule that contains part or all of an organism's genetic material.…

Q: Draw a Punnett square for the dihybrid cross described below (it is the same story as given for…

A: X linked characters are those where the the gene in question is located on the X chromosome. Females…

Q: The mutations called bobbed in Drosophila result from variable reductions (deletions) in the number…

A: Mutations known as bobbed results from varied deletions in the number of amplified rRNA coding…

Q: Why are people with balanced chromosomal translocations phenotypically normal? Do they suffer from…

A: Chromosomal translocations are genomic events in which either a part or the entire chromosome breaks…

Q: Diagram how aneuploidy may occur through Mitosis starting from a parent cell at G1 phase. Make sure…

A: Humans are diploid organisms, which mean that they have two copies of each chromosome in them. The…

Q: In fruit flies, eye color is an X-linked trait.  Red eyes (XB) are dominant to maroon eyes (Xb). A…

A: An alternate form of a gene is called alleles.  The dominant allele is represented by a capital…

Q: Two different genes are located on the same chromosome in rabbits. A particular female rabbit is…

A: Genes on different chromosomes are inherited independently of each other because each pair of…

Q: THEME 2: The figure below shows the types and numbers of gametes produced by a trihybrid. Phenotype…

A: A cross which involves three loci is known as three point cross.There are  different types of…

Q: What is dosage compensation with respect to the sex chromosomes? Briefly explain how this is…

A: The method by which organisms adjust gene expression between individuals of different biological…

Q: The order of the genes on a plant chromosome is A, B, C, where A and B are located 10 cM apart and B…

A: Genes A and B are located 10 cM apart and B and C are located 3cM apart. Hence, S.C.O for A and B =…

Q: In Drosophila, a heterozygous female for the X-linkedrecessive traits a, b, and c was crossed to a…

A: A dihybrid cross with unlinked markers should produce a 1:1:1:1 ratio, according to Mendel's…

Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.