Fine spines (s), smooth fruit (tu), and uniform fruit color (u) are three recessive traits in cucumbers, the genes for which are linked on the same chromosome. A cucumber plant heterozygous for all three traits is used in a testcross, and the following progeny are produced by this testcross: Tu Tu 70 Tu 21 tu 4 tu 82 tu 21 Tu 13 tu 17 Total 230

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: In a testcross for two genes, what types of gametes are produced with (a) complete linkage, (b)…

A: Testcross is a breeding of an individual with homozygous recessive individual. The aim is to…

Q: In EEG, T3 stands for: Select one: a. Temporal, left hemisphere b. Temporal, right hemisphere c.…

A: In EEG, T3 stands for: option a. Temporal, left hemisphere

Q: An individual with genotype AaBbCCDdEE can make many kinds of gametes. Which of the following…

A: Gametes are sex cell or reproductive cell that consists of a haploid set of chromosomes. Gametes are…

Q: What do monohybrid crosses reveal?

A: A cross that involves single pair of contrasting characters is known as Monohybrid cross.

Q: what is science

A: Humans have been known for observing, discovering, searching for various things present in their…

Q: Draw a simple sketch illustrating how nondisjunction in meiosis can lead to Down syndrome.

A: To draw: A simple sketch illustrating how nondisjunction in meiosis can lead to Down syndrome

Q: Genes Q, R, and S are on the same chromosome. The crossoverfrequency between S and Q is 5%, the…

A: Genes that are very far apart in a chromosome or genes present in different chromosomes segregate…

Q: Bees have a haplodiploid sex determination.  The recessive allele ivory causes bees to have white…

A: In honeybee, the sex is determined by being haploid or diploid. Here, females are diploid while…

Q: Distinguish between a monohybrid cross and a testcross.

A: The genetics is the branch of biology that deals with the study of genes, genetic variation, and…

Q: A non-dividing yeti skin cell is shown below. Assuming a single crossover evetn occurs between the…

A:

Q: What is the difference between the X-Y and X-0 systems of sex determination?

A: The biological system that is known to determine the development of sexual characteristics is known…

Q: Diagrammatic representation of a test cross?

A: A test cross is used to determine whether the dominant phenotype of an individual is due to…

Q: A boy with Down syndrome (trisomy 21) has 46 chromosomes. One parent and his two older sisters have…

A: Since, we are entitled to answer the first three subparts of a question. We are answering the first…

Q: What is a testcross, and why is it useful?

A: Sir Gregor Mendel was a priest and a teacher who did the famous hybridization experiment on garden…

Q: List all the possible genotypes and phenotypes for polydactyly. Use theletters D and d for the…

A: An allele is the variant form of a gene occupying the same loci on a chromosome. An individual…

Q: Growth Rate 80 red fast 88 purple slow 18 red slow 14 purple fast What is the distance…

A: Here, in 3rd and 4th case there are recombinant progenies because they have different growth rate…

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: Why is the Barr body more brightly stained by DNA-specific dye in a cell nucleus?

A: Introduction: Barr body is the inactivated X chromosome found in the cells containing more than one…

Q: What is a test cross, and how do you determine it?

A: Test cross:In genetics, test cross is used to define the genetic makeup of a dominant gene by…

Q: Why is a testcross unnecessary to determine whether a snapdragon with red flowers is homozygous or…

A: A test cross is defined as an experimental cross where one of the organisms has a recessive…

Q: Female flies with white eyes and miniature wings (both X-linkedrecessive traits) were crossed to…

A: Chromosomal composition of these rare females will be – XXY. Both the X chromosomes must be coming…

Q: You collected the following results from a test-cross you set-up using fruit flies. 52 wildtype…

A: Fruit flies ( Drosophila ) are test crossed with each other .  Results obtained are :-  A ) Wild…

Q: Which, if any, of the following sex-chromosome aneuploids in humans are fertile: XXX, XXY, XYY, XO?

A: Aneuploids are a kind of chromosomal mutations which results in abnormal number of chromosomes.

Q: How is a cross made in a fungus such as Neurospora?Explain how to isolate asci and individual…

A: Fungi are microbial organisms that are placed under Kingdom Fungi. They are multicellular eukaryotic…

Q: What is a Barr body, and where is it found in a cell?

A: A chromosome is a long DNA molecule with part or the whole hereditary material of a creature. Most…

Q: What is a molecular marker? Elaborate physical chromosome mapping with the help of molecular markers

A: Molecular mapping is used to find the location of gene on the chromosome and also the distance…

Q: In which parent and during which meiotic division did non-disjunction occur? If there is more than…

A:

Q: Fruit flies normally have eight chromosomes. The diagram below shows the result of meiosis in three…

A: Non-disjunction is defined as the failure of segregation of the chromosomes during anaphase stage of…

Q: Explain the purpose of a testcross.

A: A test cross is a method for investigating the genotype of a parent organism. Early utilization of…

Q: Describe the basis for chromosome mapping in the Hfr * F- crosses.

A: Hfr chromosome is formed by integration of the F-plasmid into the bacterial chromosome.  The point…

Q: Following primary non-disjunction, how many gametes will be nulliploid (zero copies) for the…

A: Nondisjunction occurs when the there is incomplete separation of chromosomes during meiosis. It can…

Q: If the G locus were 50 or more map units from the centromere, what types and proportions of gametes…

A: Introduction Recombination:- It is a process by which pieces of DNA are broken and recombined to…

Q: On chromosome 4 in Nuerospora, the allele pyr-1 results in a pyrimidine requirement for growth.  A…

A: Distance between centromere and gene in a tetrad = 1/2 (#of recombinants / total # tetrads) × 100…

Q: What is the genotype of the F1 generation of the corn monohybrid cross described above? What is the…

A: When we cross pure purple kernel (RR) with pure yellow kernels (rr),    Parents genotypes      RR…

Q: Two genes ‘d’ and ‘t’ are assumed to show linkage as well as produce recombinants upto 30%. If dd/…

A:

Q: Write a short on test-cross?

A: Gregor Johann Mendel was an Augustinian monk. He worked on garden pea for the genetic experiment and…

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.