Animal Genetics, Biotechnology, and Reproduction

Comprehensive vocabulary flashcards covering principles of animal genetics, modern biotechnology, gene mapping, genetic disorders, and reproductive biology across domestic livestock and avian species.

Genotype

The genetic constitution of an individual organism that controls phenotypic animal traits such as growth, coat color, and gait type.

Meiosis

The specialized form of cellular division responsible for producing gametes that carry half the genetic message of the parent cells.

Transcription

In protein synthesis, the enzymatic process of synthesizing an RNA molecule that is complementary to a DNA template sequence.

Gregor Mendel

The scientist who discovered the foundational principles of inheritance in 1866 through his experiments with garden peas.

Homozygous Dominant

A genetic state characterized by two identical dominant alleles for a given gene, designated notationally as $RR$.

Aneuploidy

A chromosomal condition in which an organism has an abnormal chromosome number that is not an exact multiple of the monoploid number.

Guanine and Cytosine Base Pairing

Complementary nitrogenous base pairing in nucleic acids stabilized specifically by three hydrogen bonds, rather than double bonds.

Gene

A discrete hereditary unit that contains the biochemical information necessary to regulate cellular processes.

Bovine Chromosome Number

The diploid ($2n$) karyotypic chromosome count found in domestic cattle, consisting of $60$ chromosomes.

Recombinant Human Insulin Production

The biomanufacturing method in which genetically engineered bacteria are modified to produce human insulin.

Transgenic Bioreactors

Genetically modified livestock, such as cows, goats, and sheep, developed to synthesize and secrete bioactive pharmaceutical molecules into bodily fluids including blood, urine, and milk.

Input Traits

Agronomic characteristics engineered into crops to improve production efficiency, such as pest resistance, temperature tolerance, and handling qualities, distinguished from output traits like improved nutrition.

Gene Map

A visual diagram showing the physical or relative locus of specific genes distributed along a chromosome, identified using molecular probes.

Gene Mapping Techniques

Methodologies employed collectively to analyze and map the animal genetic code, including statistical analysis, DNA sequencing, and the polymerase chain reaction (PCR).

Gene Therapy

The medical process of treating a disease by replacing a defective, missing, or malfunctioning gene with a functional genetic sequence.

rDNA Technology

Recombinant DNA procedures that enable the artificial joining and manipulation of genetic material from different sources, foundational to modern biotechnology.

Bovine Somatotropin (bST)

A metabolic protein hormone administered to lactating dairy cattle to increase total milk yields.

Gene Enhancement

The controversial biotechnological application of genetic modification intended to alter non-pathological human physical or performance traits such as height and eye color.

Genetically Modified Crops

Transgenic agricultural plant varieties, which outnumber all other genetically engineered organisms globally.

Mitosis

The eukaryotic process of somatic cell division resulting in two genetically identical diploid daughter cells.

Genome

The entire complementary set of genetic instructions and chromosomal DNA contained within an organism.

Genetic Drift

Random fluctuations in allele frequencies within a small breeding population governed strictly by chance.

Animal Breeding

The discipline and practical application of genetic principles aimed at improving domestic animal populations.

DNA as Genetic Material

The landmark scientific discovery confirmed in 1953 establishing deoxyribonucleic acid as the primary vehicle of biological heredity.

Blood Type AB

A codominant mammalian blood phenotype featuring the concurrent expression of both A and B erythrocyte surface antigens.

Centromere

The specialized constricted chromosomal region where sister chromatids join and spindle fibers attach during mitotic and meiotic division.

Micropropagation

A plant tissue culture technique wherein isolated vegetative cells or tissues from a donor plant are cultured in vitro to regenerate whole, identical clonal plants.

Recombinant DNA

Artificially engineered chimeric DNA molecules constructed in vitro by combining fragments from distinct biological species.

Nutraceuticals

Dietary food substances or consumables formulated to deliver both physiological nutritional value and pharmaceutical health benefits.

Genetically Modified Organism (GMO)

Any plant, animal, or microorganism whose genome has been modified using modern genetic engineering technologies.

Dolly the Sheep

The world's first mammalian clone derived from an adult somatic cell, unveiled in 1997 via somatic cell nuclear transfer.

Polymerization

The chemical synthesis of high-molecular-weight macromolecular compounds through the continuous covalent bonding of repeating monomer units.

Incomplete Dominance

An allelic interaction in which neither allele is fully dominant, producing an intermediate heterozygous phenotype distinct from both homozygous parental phenotypes.

Heterozygous Coat Color (Rr)

The physical expression seen when dominant allele $R$ (black) masks recessive allele $r$ (red), resulting in an animal displaying a black coat phenotype.

DNA Ligase

The molecular enzyme used during genetic engineering to seal phosphodiester backbones, permanently inserting exogenous DNA fragments into bacterial plasmids.

Pharming

The agricultural production of human medical therapeutics and pharmaceutical compounds using genetically engineered livestock.

Founder

A primary transgenic animal that successfully integrates an introduced gene and is subsequently bred to establish a transgenic lineage.

Sex-Influenced Inheritance

A genetic pattern wherein the phenotypic expression of an identical autosomal genotype differs between biological sexes, as demonstrated by the horned/polled condition in sheep.

DNA Replication

The cellular enzymatic mechanism by which a parent double-stranded DNA molecule synthesizes two identical replica strands.

Karyotype

A complete, standardized photographic or visual representation of the chromosome set of an individual or species aligned by size and morphology.

Genetic Engineering

The direct molecular manipulation and horizontal transfer of specific genes or recombinant sequences across taxonomic species boundaries.

Restriction Enzyme

An endonuclease enzyme that cleaves double-stranded DNA chains at specific palindromic sequences to isolate target DNA fragments.

Transgenic Rennet

A bioengineered microbial enzyme preparation approved in 1990 that represented the first commercially authorized food product derived from transgenic biotechnology.

Biotechnology

The industrial and commercial application of tools, processes, and discoveries originating from the biological sciences.

Epididymis

The convoluted male reproductive duct bridging the testis and ductus deferens that mediates sperm maturation, storage, and transport.

Testcross

A diagnostic breeding scheme pairing an individual of unknown genotype with a homozygous recessive tester to determine homozygosity versus heterozygosity.

Monosomy

An aneuploid genetic state in a diploid organism defined by the absence of a single chromosome from a homologous pair, symbolized as $2n - 1$.

Epistasis

An inter-locus gene interaction where the phenotypic manifestation of an allele at one genetic locus is masked or modified by alleles at an entirely different locus.

Xenotransplantation

The surgical transplantation of living animal cells, tissues, or organs harvested from genetically engineered species into human recipients.

Marker Assisted Selection

An animal selection strategy where linked molecular DNA sequences act as indirect diagnostic flags to select for quantitative trait loci or specific alleles.

Codominance

A condition in which both alleles in a heterozygote lack dominant-recessive hierarchies and are simultaneously fully expressed in the phenotype.

Principle of Segregation

Mendel's law stating that allele pairs separate during gametogenesis such that each mature gamete receives only a single allele for each locus.

Selection

The differential reproductive management process where specific individuals within a population are favored to produce more progeny than others.

Queen

The correct zoological term designated for an intact, sexually mature female cat.

Swine Autosome Number

The total non-sex chromosome count found in somatic cells of pigs, which possess exactly $36$ autosomes within their $2n = 38$ karyotype.

Gonadotropin Releasing Hormone (GnRH)

A master neurohormone produced in the hypothalamus that stimulates the anterior pituitary to secrete luteinizing hormone and follicle stimulating hormone.

Cowper's Gland

A paired accessory sex gland (bulbourethral gland) exclusive to the male reproductive system that is not found within the female reproductive tract.

Calving

The biological act of parturition or giving birth in cattle.

Endometrium

The mucosal inner lining of the maternal uterus, categorized separately from true extraembryonic fetal membranes (chorion, amnion, and allantois).

Artificial Vagina

The standard mechanical collection apparatus providing thermal and tactile stimulation for collecting semen from males during livestock breeding.

Avian Ovulation Recurrence Interval

The approximately $30\text{-minute}$ physiologic window that elapses in a domestic hen between oviposition (laying of an egg) and subsequent ovulation.

Oviduct Transit Duration

The normal chronological timeframe of $3\text{ to }6\text{ days}$ that fertilized mammalian ova typically remain within the oviduct prior to uterine entry.

Swine Ejaculate Volume

The reproductive characteristic of domestic boars having the largest volume of seminal ejaculate among common farm livestock species.

Embryo Transfer (Livestock Availability)

The assisted reproductive technology introduced commercially to farm livestock producers during the decade of the 1970s.

Functional Avian Ovary

The reproductive anatomical condition in domestic hens where only $1$ functional ovary (the left ovary) develops and participates in egg production.

Generational Interval

The average chronological age of parental animals within a species when their first replacement offspring are delivered.

Avian Testicular Anatomy

The physiological feature of male birds possessing bilateral testes enclosed internally within the body cavity, differing from the external scrotal testes of mammals.

Embryo Transfer

The reproductive management technique in which early-stage embryos are collected from a genetically superior donor and placed into a recipient female.

Follicle Stimulating Hormone (FSH)

An anterior pituitary gonadotropin that drives follicle growth, development, and maintenance in the female and spermatogenesis in the male.

Ovulation

The physiological rupture of a mature ovarian follicle resulting in the release of an unfertilized ovum into the infundibulum.

In Vitro Fertilization

An assisted reproductive procedure where the union of oocyte and spermatozoon occurs outside the animal's reproductive tract under laboratory conditions.

Infundibulum

The funnel-shaped cranial terminus of the oviduct that surrounds the ovary to capture the ovum released during follicular rupture.

Colostrum

The initial, antibody-rich mammary secretion produced by a dam immediately following parturition to confer passive immunity to the newborn.