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Poultry Breeding Chapter 8
Poultry Breeding Chapter 8
13
Agriculture
Undergraduate 3
02/24/2018

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Cards

Term
the number of chromosomes in birds
Definition
78
Term
the sex chromosomes in birds
Definition
Z and W
Term
homogametic
Definition
ZZ (male)
Term
heterogametic
Definition
ZW (female)
Term
which chromosome is bigger? Z or W?
Definition
Z
Term
sex-linked traits
Definition
traits linked to the Z chromosome
Term
why all sex-linked genes are dominant
Definition
because there are no alleles of the same gene on the W chromosome to offer dominance
Term
hemizygous
Definition
Having one pair of a gene, e.g. a gene on the Z chromosome
Term
sex-limited inheritance
Definition
type of inheritance in which phenotypic expression is limited to one sex, e.g., egg production and milk yield
Term
sex-influenced inheritance
Definition
type of inheritance where mode of gene expression differs between males and females
Term
sex linkage or sex-linked inheritance
Definition
pattern of inheritance for genes located on sex chromosomes
Term
examples of sex-limited inheritance
Definition
-egg production
-milk yield
Term
example of how day-old chicks can be sexed with minimum labor cost
Definition
-Barring is dominant over non-barring (solid black).
-late feathering dominant over early feathering
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