17. inheritance Flashcards
Genotype
genetic constitution of an organism
Phenotype
interaction of genotype and environment
difference between homo and heterozygous homologous chromosomes
homozygous chromosomes carry the same allele, hetro has two different alleles
autosomal linkage represented with…
single letter, one cap one lower
Aa Bb
Cystic fibrosis is caused by a recessive allele.
If two carriers reproduce, what is the probability they will have a child with cystic fibrosis?
what is the probability they will have a girl with cystic fibrosis.
Ff x Ff
genetic cross on miss estruch
25% prob of a child having cystic fibrosis
12.5% of having a girl with cs
Cows can be red, white or roan in colour. Red and White are both dominant.
What is the probability that they will produce red offspring?
CrCw x CRCW
cross on miss estruch
25% red
Colour blindness is caused by a recessive allele found only on the X chromosome.
If a non colour-blind male reproduces with a female carrier of the allele, what is the probability their children will be colour blind?
genetic genotypes XRXr x XRY
cross on estruch,
25% chance
what is Epistasis
One gene influences the expression of another gene.
What is a dihybrid cross?
inheritance of two genes considered at the same time.
What must you show in a dihybrid cross?
parental phenotype + genotype
possible gametes
offspring phenotype + genotype
proportion of each phenotype
each gamete should show ____ copy of each _____
copy, gene
Why might punnet squares be inaccurate
crossing over
mutations during meiosis
What is autosomal linkage?
alleles for the same gene are linked and inherited together. effecting gametes
when do you reject the null hypothesis?
stats result is positive and greater than critical value, sufficiant eveidence to reject null hypothesis.
A p-value lower than 0.05 is significant (not due to chance), reject null hpothesis
