principles of inheritance and variations Flashcards
year at which Gregor Mendel experimented garden pea
1856-1863
eg for incomplete dominance
antirrhinum sp. , snap dragon, starch synthesis
eg for co dominance
ABO blood group
there are —— genotypes and ——– phenotype in human RBC
6,4
eg for pleiotropy
Phenylketonuria
1. mental retardation
2. reduction in hair and skin pigmentation
starch synthesis gene in pea
eg for Multiple alleles
ABO blood grp
inheritance of two gene
Phenotype
Genotype
ratios
9;3;3;1
1;2;1;2;4;2;1;2;1
who proposed chromosomal theory of inheritance
sutton and boveri
experiment verification of chromosomal theory done by ?
TH Morgan, drosophila melanogaster
eg of polygenic traits
human skin colour, height
XO type eg
grasshopper
ZW type eg
female heterogamety, birds
sex determination in honey bee is a?
Haplo-diploid sex determination
point mutation with eg
change in single base pair of DNA
eg; sickle cell anaemia
eg for autosomal dominant
myotonic dystrophy
eg for autosomal recessive
sickle cell anaemia
all about colour blindness
sex linked recessive
8% of male and 0.4% of female
Haemophilia
x linked recessive
single blood clotting protein is effected
Phenylketonuria
Autosomal recessive
lack enzyme that converts phenylalanine to tyrosine
results in mental retardation
thalassemia
autosomal recessive
alpha thalassemia on chromosome 16
beta thalasemia on chromosome chromosome 11
Down syndrome
trisomy 21
Langdon down 1866
klinefelters syndrome
karyotype 47
sterile individuals
turners syndrome
monosomy 45
XO , sterile female
% of recombination seen in yellow body white eye
1.3%
