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Poultry Breeding Chapter 2
Poultry Breeding Chapter 2
30
Agriculture
Undergraduate 3
01/12/2018

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Term
genetics
Definition
the study of the basis of heredity and variation
Term
heredity
Definition
simply means that offspring develop some of the same characteristics like their parents
Term
variability
Definition
differences
Term
Trait or Character
Definition
Any consistently observed or measured characteristics off an individual
Term
phenotype
Definition
the observable or measurable form of a trait
Term
monohybrid cross
Definition
A cross between genotypes (pure-lines) that is homozygous for alternative alleles of the same gene
Term
phenotypic ratio of monohybrid cross between 2 heterozygotes
Definition
3:1
Term
allele
Definition
different or alternative form of a gene
Term
genotype
Definition
the genetic makeup of an individual
Term
MENDEL’S LAW OF SEGREGATION
Definition
Members of each pair of alleles separate from each other when an individual forms germ cells or gametes
Term
Gene
Definition
The basic unit of inheritance consisting of DNA segment at a specific location on a chromosome
Term
chromosomes
Definition
which are very long strands of DNA in the nucleus of every cell of an organism
Term
Locus
Definition
The specific location of a gene on a chromosome
Term
number of chromosomes in a chicken
Definition
78 (38 pairs of autosomes and one pair of sex chromosome)
Term
the way the sex chromosomes are in birds
Definition
ZZ Male
ZW Female
Term
Heterogametic sex
Definition
The sex or gender that makes two different chromosomal types of gamete; e.g. female birds (Z and W)
Term
Homogametic sex
Definition
The sex or gender that makes only one chromosomal type of gamete; e.g. male birds (Z).
Term
Monohybrid
Definition
An offspring resulting from a cross between genotypes that are homozygous for the alternative alleles of a gene.
Term
dihybrid cross
Definition
cross of pure line plants that differ at two loci
Term
MENDEL’S LAW OF INDEPENDENT ASSORTMENT
Definition
Segregation of genes at one locus does not influence the segregation of genes at another locus
Term
Mendel's 2 laws
Definition
law of segregation

law of independent assortment
Term
why could have Mendel been lucky?
Definition
because all the traits he observed each occur on different chromosomes
Term
Linkage
Definition
If two different genes are located relatively close to each other on the same chromosome they cannot segregate independently
Term
Polygenetic Inheritance
Definition
Traits are determined by more than one gene, e.g. egg size, body weight.
Term
Pleiotropy
Definition
A gene can affect more than one trait.
Term
Cytoplasmic inheritance
Definition
Mitochondria have their own DNA, and mitochondria DNA is maternally inherited. Therefore some traits may be under the control of genes in the cytoplasm (mitochondria).
Term
Epistasis
Definition
Interaction of alleles of two or more genes to define a phenotype.
Term
how comb type is determined in chickens
Definition
interactions of the rose and pea loci
Term
example of epistasis in chickens
Definition
interaction of the rose and pea loci to determine comb type
Term
Genomic imprinting
Definition
When an offspring inherit both alleles of gene from one parent and none from the other parent.
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