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true breeding
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allele
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module 8

biology module 8

QuestionAnswer
true breeding if an organism has a certain characteristic that is always passed on to its offspring, we say that this organism bred true with respect to that characteristic
allele one of a pair of genes that occupies the same position on homologous chromosomes
recessive allele an allele that will not determine the phenotype unless the genotype is homozygous in that allele
monohybrid cross a cross between two individuals, concentrating on only one definable trait
dihybrid cross a cross between two individuals, concentrating on two different traits
autosomal inheritance inheritance of a genetic trait not on a sex chromosomes
state the principals of Mendelian genetics using the updates terminology 1. the traits of an organism are determined by its genes 2. each organism has two alleles that make up the genotype for a given type 3. in sexual reproduction, each parent contributes ONLY ONE of its alleles to its offspring 4. in each genotype, there is a dominant factor will be expressed
in humans, the ability to roll one's tongue is a dominant genetic trait. if "R" represents this allele and "r" represents the recessive allele, what are the possible genotypes for a person who can roll his tongue? they could have RR or Rr
for a given trait, how many alleles does a normal gamete have? normal gamete has ONE allele for each trait
for a given trait, how many alleles does a Non-gamete cell have? non-gamete cells have TWO alleles for each trait.
why do recessive phenotypes in sex-linked traits show up in males significantly more often then in females? in sex-linked traits, there is no allele on Y chromosomes. males only have one allele which makes it easier in expressing the recessive phenotype.
why would you not expect twins (who have identical DNA) to be identical in every way? Genetics is only one part of a person's makeup
name four means by which genetic disorders arise sex-linked inheritance, autosomal inheritance, allele mutation, change in chromosome structure, or change in chromosome number
 

 



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