Mitotic recombination can occasionally produce a twin spot.Let’s suppose an animal species is heterozygous for two genesthat govern fur color and length: one gene affects pigmentation,with dark pigmentation (A) dominant to albino (a); the other geneaffects hair length, with long hair (L) dominant to short hair (l).The two genes are linked on the same chromosome. Let’s assume ananimal of this species is AaLl; A is linked to l, and a is linked to L.Draw the chromosomes labeled with these alleles, and explainhow mitotic recombination could produce a twin spot with onespot having albino pigmentation and long fur and the other havingdark pigmentation and short fur.

Q: EVOLUTION CONNECTION Crossing over is thought to beevolutionarily advantageous because it…

A: Many of the genes which are essential for the production of sperm are located on the Y chromosome.…

Q: Consider two loci A and B that are 30 cM apart on chromosome 1 in the fruit fly. A paracentric…

A: There are two types of inversions. The paracentric and pericentric. In a paracentric inversion,…

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

A: Genetics is a branch of biology that deals with genes, heredity, and variation. Heredity purely…

Q: Inversions are known to affect crossing-over. The following homologs have the indicated order (the…

A: Insertion, deletion, substitution, and inversion are the four types of mutations. Insertion is a…

Q: In a species of rat, the map unit distance between genes A, B, C and D were as follows: (in the…

A: There are 4 genes : A , B , C , D in the species of rat. Basically ,  Map unit or m.u or cM is the…

Q: Can simple translocations ever be balanced? I know with reciprocal translocations that if you're…

A: Exchange of genetic information between different parts of the chromosome is called genetic…

Q: Hemophilia and color blindness are both recessive conditions caused by genes on the X chromosome. To…

A: Recombination frequency is defined as the proportion of recombinant offspring produced in a genetic…

Q: The wild-type (normal) fruit fly, Drosophila melanogaster, has straight wings and long bristles.…

A: Wild type fruit fly Drosophila melanogaster posses straight wings and a long bristles. The mutant…

Q: Two phenotypically normal parents produce a phenotypically abnormal child in which chromosome 5 is…

A: The scenario described is indicative of a rare genetic condition known as unbalanced translocation.…

Q: A researcher is working with a flower species in which red flower color (R) is dominant to white…

A: In genetics , cross are done between selected species having a particular allele combination to…

Q: Let’s suppose that a gene affecting pigmentation is found on the Xchromosome (in mammals or insects)…

A: Introduction  The total chromosomes in the body are divided into two groups: Autosomes…

Q: In the model plant Arabidopsis thaliana, the following alleles were used in a cross: T = presence of…

A: a) To find: The appearance of the F1

Q: An inversion heterozygote has the following inverted chromosome. (A diploid is represented in each…

A: PERICENTRIC INVERSIONS PERICENTRIC INVERSION includes the centromere. After the chromatid…

Q: You continue your experiments with the black mutation on chromosome II. You cross the reciprocal…

A: Introduction: The most advancing branch of science is genetics. The study of genetics comprises…

Q: Let’s say there is an organism with two pairs of alleles, W/w and Z/z, each pair is located on a…

A: Mitosis is a type of cell division that occurs in all the cells except sex cells. Here the…

Q: Below is a pedigree from one family (two parents and eight children). Four of the children…

A: Pedigree chart It is a diagram that represents the occurrence of phenotypes of a particular gene in…

Q: In an electrophoretic gel across which is applied a powerful electrical alternating pulsed field,…

A: SDS-PAGE (Sodium Dodecyl Sulphate-Polyacrylamide Gel Electrophoresis) is a quantitative method to…

Q: In a sample of 1000 patients with Down syndrome, a geneticist discovers that 95% of them are…

A: Trisomy is a kind of polysomy in which three instances of a particular chromosome occurs. Generally…

Q: In Drosophila the genes forked bristles (f and f+) and vermilion eyes (v and v+) are ~24 m.u.  apart…

A: During meiosis, genes between homologous chromosomes are transferred in genetic recombination, which…

Q: Researchers have discovered that some regions of chromosomesare much more likely than others to…

A: No, the distance between A and B and C and D are not same. As A and B genes are in hot spot means…

Q: Consider three genes on the same chromosome, Gene A, Gene B and Gene C. You perform three factor…

A: As 3 genes are located on the same chromosome then the crossing over event is very rare.

Q: DRAW IT Suppose, as in the questionat the bottom of Figure 15.9, the parental(P generation) flies…

A: Consider the following V= Normal wing v= Vestigial wing G= Gray body-color g= Black body-color Then,…

Q: In flies, long wings are a dominant trait, and short wings are a recessive trait. Medium wings are…

A: Homozygous individuals mean there is a pairing of the two same types of alleles and both of the…

Q: How is it still balanced if, let's say we have 100% chromosome A and 100% chromosome B. In simple…

A: Translocation is a phenomena in which genetic material is transferred from one chromosome to be…

Q: Fathers contribute more new point mutations to theirchildren than mothers. You may know from general…

A: Each cell possess 23 pairs of chromosomes with 22 pairs of autosomes and one pair of sex…

Q: You are given a Drosophila female that looks wild-type but is heterozygous for mutations in tan body…

A: Three-point cross: In genetics, the three-point cross is used to determine the distance between two…

Q: What gene is in the middle?

A: The genotypes found most frequently are the parental genotypes. Hence parents are: + + cn and b wx +…

Q: Vestigial wing is a recessive autosomal mutation in the fruit fly Drosophila melanogaster. Wild-type…

A: The alleles are the alternative forms of a gene that are located on the same locus of a homologous…

Q: In an electrophoretic gel across which is applied a powerful electrical alternating pulsed field,…

A: Introduction Gel electrophoresis is a technique that uses size and charge to separate and analyse…

Q: An STR on chromosome 9 is immediately adjacent to a gene involved in a dominant blood disorder (only…

A: Short Tandem repeats (STR): This are short repeated DNA sequences in a human body. This accounts for…

Q: Item 10 10 of 15 A cross in Drosophila melanogaster involved the recessive X-linked genes for white…

A: Three point test cross involves three genes.

Q: Mutation

A: A) Genetic in drosophila have provided a wealth of information about a variety of cellular and…

Q: Scale color in a lizard species is inherited via a single gene with 6 different alleles. (a) How…

A: Apart from the openings of eyes, mouth, nostrils, and cloaca, most of the lizards are totally…

Q: If you assume Figure 2-15 also applies to mice and youirradiate male sperm with X rays (known to…

A: The similar regions in two chromosomes  are considered to be homologous. Hence the X and Y…

Q: In Figure 15-3a, what would the kernel phenotype be ifthe strain were homozygous for all dominant…

A: The genetic background, or the sum of all genes affecting the anthocyanin pathway, determines the…

Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.