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#genes

7 public questions tagged with this topic.

Genetics

An organism has 10 pairs of chromosomes. If all the genes in this organism were mapped how many linkage groups would be

This outcome reflects metabolic engineering and inheritance, where exogenous gene introduction and pathway extension enable trait improvement. Option A captures this correctly because it demonstrates metabolic extension and combinatorial biosynthesis, consistent with textbook descriptions and experimental observations in genetics and biotechnology.

Ref: Pierce, Genetics: A Conceptual Approach, 6th Edition, Chapter 3, discusses genotype-phenotype correlation and inheritance patterns providing framework for genetic transmission and metabolic engineering.

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BOTANY

Which of the following statements about genes and alleles is incorrect?

Some genes have more than two alleles, as seen in the ABO blood group system. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.

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Transgenic Plant -1

Bollgard II cotton expresses which genes?

Bollgard II represents stacked trait strategy designed to delay resistance and broaden insecticidal spectrum. First generation Bollgard expressing only Cry1Ac selected resistance alleles in Helicoverpa armigera under continuous exposure. Incorporating second toxin Cry2Ab with different binding site, recognizing distinct aminopeptidase N and ABC transporter, requires insects to carry simultaneous mutations in two receptors to survive, probability drastically lower. Both genes driven by enhanced constitutive promoters provide high dose exceeding LD99 for heterozygous susceptible larvae. Expressi

Ref: ISAAA Brief 43 Bollgard II; Tabashnik Nat Biotechnol 2009 pyramiding; NCBI NBK24601 Cry1Ac Cry2Ab; https://www.isaaa.org/resources/publications/briefs/43/

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MOLECULAR EVOLUTION

Genes evolving fastest are usually:

Pseudogenes reflects key principle in quiz on molecular evolution pyqs solved -sec d, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Pseudogenes aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Pseudogenes fits helps integrate natural selection, environment.

Ref: Nei & Kumar, Molecular Evolution, Clocks and Purifying Selection.

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Basics of Inheritance

The law of independent assortment applies to

Law of independent assortment states alleles of genes located on different chromosomes or far apart assort into gametes independently of other gene pairs. Orientation of bivalents at metaphase I is random, so combination of maternal and paternal alleles at separate loci occurs by chance. Closely linked genes on same chromosome show parental bias, sex-linked and mitochondrial patterns deviate due to hemizygosity and maternal transmission. For unlinked genes, gametic proportions equal, producing dihybrid phenotypic classes 9:3:3:1 and confirming 2^n diversity potential. This principle is routine

Ref: Pierce, Genetics, 7th ed., Chapter 3: Independent Assortment of Unlinked Genes

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Basics of Inheritance

Independent assortment of genes occurs when genes are

Independent assortment of genes predominates when loci reside on different chromosomes or sufficiently distant on same chromosome such that recombination frequency approaches fifty percent, breaking linkage. Random orientation of each bivalent at metaphase plate results in uncorrelated segregation producing all possible allele combinations in gametes. Closely linked genes co-segregate predominantly parental, presence on same chromosome only does not guarantee independence unless far apart, mitochondrial genes show maternal clonal inheritance. Unlinked condition yields dihybrid phenotypic ratio

Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 4: Independent Assortment

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