26. DNA from a bacterial strain that is his* leu* lac* is used to transform a strain that is his leu lac". The following percentages of cells are transformed: Donor Recipient strain strain Genotype of Percentage transformed cells of all cells his* his leu his* leu* leu* lact 0.02 lac lac* his* leu* lac 0.00 hist leu lac* 2.00 his* leu lac 4.00 his leu* lac* 0.10 his leu 3.00 lac* his leu* lac 1.50

Q: Given that most chromosomes occur in homologous pairs, do most genes also occur in pairs?

A: Human beings have 23 pairs of chromosomes. Out of which 22 pairs are called autosomes and one pair…

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: How do we know that chromosomes exist in homologous pairs?

A: The eukaryotic cells contain different organelles like lysosomes, mitochondria, Golgi apparatus,…

Q: Why is the term “crossing-over” appropriate for the exchange of DNA segments between homologous…

A: Crossing over can be defined as the exchange of genetic material that occurs between the non-sister…

Q: Raj Kumar and his wife Sunita have been blessed with a baby girl. On the other hand, Kripa Shanker…

A: Reproduction ensures the continuity of species on earth. It can occur in two ways that is sexual…

Q: In what type of chromosome is the centromere is very close to one end?

A: Chromosomes are long thread-like structures that carry coded genetic information in the form of DNA.…

Q: How many genes are there on chromosome 3?

A: All cellular systems are controlled by proteins. The instruction for the synthesis of proteins is…

Q: What unusual feature of the Y chromosome allows some recombination among the genes found on it?

A: Every individual has 23 pairs of chromosomes, out of which 22 are identical, one ie sex chromosome…

Q: Why do you think there are no viable trisomies of chromosome 1?

A: Chromosome 1 is the largest chromosome in human. Approximately 8% of the total DNA is found in this…

Q: How do we know whether two chromosomes are homologous?

A: Homologous chromosomes are made up of chromosome pairs having  Similar length, Similar centromere…

Q: What does recombination maps of a chromosome show?

A: In the field of genetics, understanding the organization of genetic material on a chromosome is…

Q: What are genes located on the same chromosome?

A: Genetic recombination refers to the rearrangement of DNA sequences by the breakage and rejoining of…

Q: Homologous chromosomes can be either monads or dyads. Explain. How is it possible to have…

A: Homologous chromosomes are paired chromosomes. In this pair one chromosome comes from mother and one…

Q: What is pseudodominance and how is it produced by a chromosome deletion?

A: The expression of typically recessive transformation that is created when the dominant wild sort…

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: How many genes are there on chromosome 6?

A: In all the living organisms, the genetic material is organized into a specific structure known as a…

Q: Which chromosome rearrangements can cause deletions and duplications?

A: A chromosome is a thread like structure present in the nucleus of the cell. It contains the DNA and…

Q: what criteria or features are used to identify each chromosome by number?

A: The basis of cytogenetics is laid on the study of chromosomes. The isolation and identification of…

Q: approximate and base pairs) between the largest and s

A: Chromosome- A structure found inside the nucleus of a cell is refers as the chromosome.  It is made…

Q: the name of the labelled part of the chromosome? Please explain its function

A: The given diagram is of a polytene chromosome found in dipteran flies such as drosophila,…

Q: At what point duplicated chromosomes are joined?

A: Chromosomes are present inside the cell nucleus and made up of DNA (Deoxyribonucleic acid) molecules…

Q: Here are the results of the testcross: Green-eyes, wild-type wings 245 Green-eyes, miniature wings…

A: 6) The number of flies with green eyes and and miniature wings are 232, these organisms are least in…

Q: What are regions of chromosomes (or even whole chromosomes) that are heterochromatic in some cells…

A: The chromosome is a threadlike structure that is present in the nucleus and it is made up of nucleic…

Q: What chromosome rearrangement is thought to be the source of new genes?

A: Chromosome rearrangement is a change in the order of base sequences along one or more chromosomes.…

Q: Two phenotypically normal parents produce an abnormal son in which chromosome 14 is missing part of…

A: Translocations are chromosomal rearrangements caused by the exchange of components between two…

Q: hat is the 2n number for the dog?  What is the n number for the dog?

A: 2n number of the dog=78

Q: What happens when genes are close to each other in the same chromosome?

A: Chromosomes are the thread-like structures that appear during cell division.

Q: Why are the X and Y chromosomes not considered homologous even though they recombine at the PAR…

A: Sex chromosomes are a type of chromosome that participates in sex determination. Humans and most…

Q: What is nonautonomous transposition?

A: Transposition refers to the translocation in which the segment of the chromosome is relocated…

Q: What is the difference between alleles and homologous chromosomes?

A: The term 'chromosome' has been derived from the Greek words which means 'color (chroma) and body…

Q: What does the 1 chromosome do?

A: Heredity depends on the inheritance of characters from one generation to another. The machinery 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: How do you determine the order of genes on a chromosome?

A: Genes are the structural and functional units of heredity that carry coded genetic information in…

Q: describe a specific example of chromosome abnormality that leads to human cancers, such as leukemia,…

A: Chromosomal aberrations are changes in the number and arrangement of genes in the chromosomes. They…

Q: The karyotype of a young girl who is affected with Down syndrome revealed that she has 46…

A: Changes or alterations in the genetic material of an organism that lead to mutations. Mutations are…

Q: How acentric chromosomes segregate without centromeres?

A: Acentric chromosome is a fragment of chromosome that doesn't have a centromere as there lost during…

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.