A D. melanogaster male is homozygous for a translocation between chromosomes 2 and 3.  This fly is otherwise wild-type.  This male is crossed to a female fly that is homozygous for normal chromosome order and is homozygous for dumpy wings (dy), a recessive on chromosome 2 and sepia eyes (se), a recessive on  chromosome 3. A male progeny from the above cross is test-crossed to a female fly that is homozygous for dy and se.  What progeny phenotypes and frequencies are expected from this second cross? Answer choices 1/2 wild-type and 1/2 dumpy and sepia 1/4 wild-type, 1/4 dumpy, 1/4 sepia, 1/4 dumpy and sepia All dumpy and sepia                       2/3 wild-type, 1/3 dumpy and sepia 9/16 wild-type, 3/16 dumpy, 3/16 sepia, 1/16 dumpy and sepia

Q: For a hexaploid what is the value of x where x refers to the basic chromosomenumber that makes up a…

A: Ploidy refers to the number of chromosomes present in the nucleus of a cell. In normal somatic…

Q: In the fruit fly Drosophila melanogaster, a recessive condition called eyeless (ey) significantly…

A: First draw all the possible gametes for both the gametes. All gametes means all, including the…

Q: Draw two replicated, un-condensed, homologous chromosomes that have the genes A and E on them. This…

A: Homologous chromosomes - Homologous chromosomes is the pair of DNA. These chromosomes are present in…

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: Write the genotype and phenotype that would be expected from this cross.  Write the genotype and…

A:

Q: n an F1 cross, Y/y x Y/y, 3/4 of the plants are yellow and 1/4 of the plants are green. Determine…

A: When two dominant parents produce a 3:1 phenotypic ratio in the offspring, it indicates that both…

Q: Three recessive genes are linked on the third chromosome: g (gray), m (micro), and p (plum). The…

A: Parents- Parent 1= +gp=240 (the highest number)  Parent 2= m++=220 (complementary of parent 1)…

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

A: Chromosome may be defined as the condense form of DNA that can be inherited from one generation to…

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: What would be the genotype(s) of F2 offspring that carry recombinant chromosomes? (Note: recombinant…

A:

Q: Three genes yellow (y) white (w) and cut (ct) are under investigation for possible linkage on the X…

A: If the genes are located on the chromosome then they are classified as linked genes. In this…

Q: An individual that is homozygous AABBcc is crossed to an individual that is homozygous aabbCC…

A: A chromosome is a highly condensed form of DNA and It wrapped into Nucleosomes. Humans have 22…

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

A:

Q: Genes A and B are located 10 cM from each other on a chromosome. Gene C is located 25 cM from gene A…

A: As per the given values,The distance between A and B = 0.10The distance between B and C = 0.15The…

Q: Draw the structure of the acentromeric chromosome using a line and letters to designate loci in…

A: Inversion is one type of chromosome aberration where the chromosome segment is excised and…

Q: The incidence of Down syndrome will be high (nearly 50%) among the offspring of a parent with Down…

A: Down Syndrome is a chromosomal disorder where trisomic conditions occurs in 21th chromosom. The…

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: 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: The gene that controls the Duffy blood type is D (affected D is dominant to d) and the gene that…

A: D allele encodes duffy blood type and it is dominant over d allele. dd encodes wild type.  L allele…

Q: Both hemophilia (h) and favism (gd) are inherited as X-linked recessive traits. Hemophilia is an…

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

Q: A woman, seeking genetic counseling, is found to be heterozygous for a chromosomal rearrangement…

A: Detailed explanation:B.  Demonstrating chromosomal pairing during meiosis:In meiosis, homologous…

Q: A woman with no phenotype is known to have a 14:21 translocation. 1. With respect to only…

A: The rearrangement of chromosomes in which one portion of the chromosome is breakdown and is attached…

Q: XAMPLE 2: The parents in the family above produce another son, this time with two Y chromosomes and…

A: The nondisjunction occurs in the father in which during the second meiotic division nondisjunction…

Q: 34 m,u. Se a22mu ->CUE iamu e In Dropsophila, sepia eyes (se), curled wings (cu), and ebony body (e)…

A: Drosophila  is a species of flies, belonging to the Drosophilidae family, whose members are often…

Q: pid plant is heterozygous for two genes on the same chromosome, A and B. overs between the two genes…

A: There is the occurrence of possibility of two types of gametes when two genes are present on the…

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: Waxy endosperm (wx), virescent seedling (v), and shrunken endosperm (sh) are all recessive mutants…

A: Introduction: Endosperm is a tissue present inside the seeds of most of the angiosperms which…

Q: In 1965 a faulty study was performed, which suggested that the XYY karyotype was associated with…

A: XYY karyotype - Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome. This…

Q: The radish (Raphanus sativus) has a diploid number (2n) of 18. The cabbage (Brassica oleracia) also…

A: Plant breeding is an important part of agriculture, and it has been used for generations to increase…

Q: The genes F and G are on the same chromosome in a eukaryote. Using a microscope, you can see that a…

A: F and G are on the same chromosome. The cross is between FG//fg × fg/fg. The gametes produced will…

Q: In the mapping example in Fig 2, the dominant alleles were on one chromosome and the recessive…

A: Genetics is the study of inheritance and heredity. Alleles are the different forms of a gene. Allele…

Q: A diploid (2n) trihybrid individual with the genotype AaBbDd can make eight genetically different…

A: Meiosis is the process of cell division, which takes place in higher organisms that reproduce by…

Q: Duchenne muscular dystrophy (DMD) is caused bya recessive mutant allele of an X-linked gene…

A: Duchenne muscular dystrophy (DMD) is a progressive form of muscular dystrophy that results in muscle…

Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.