bio 16 Flashcards
(16 cards)
blending inheritance
traits of the offspring resemble the average of the parents
Principle of segregation
The principle by which half the gametes receive one allele of a gene and half receive the other allele
Principle independent assortment
the principle that segregation of one set of alleles of gene pair is independent of the segregation of another set of alleles of a different gene pair
true breeding
describes a trait whose physical appearance in each successive generation is identical to that in the previous one
p1 generation
The parental generation in a series of crosses
f2 generation
the second filial generation; offspring of f1 generation
rare traits that are lost over generations
traits that are not averaged in offspring
phenotype variation in population
what can blending inheritance not explain?
easy classifiable traits
focus on one or few traits at a time
count offspring
Mendel’s experiment was different because?
Dominate
the trait that appears in the heterozygous offspring of a cross between homozygous genotypes
Recessive
the trait that fails to appear in heterozygous genotypes from a cross between the corresponding homozygous genotypes
gamete
a reproductive haploid cell resulting from meiotic cell division (in some species gametes are called spores). in many species, there are two types… eggs in females, sperm in males
zygote
the diploid fertilized egg cell formed by the fusion of two haploid gametes
incomplete dominance
describes inheritance in which the phenotype of heterozygous genotype is intermediate between those of homozygous genotypes
f1
the first filial, offspring generation
epistasis
interaction between genes that modifies the phenotypic expression of genotypes
pedigree
a diagram of family history that summarizes the record of ancestral relationships among individuals
