principles of inheritance and variations

Question 1

year at which Gregor Mendel experimented garden pea

Answer 1

1856-1863

Question 2

eg for incomplete dominance

Answer 2

antirrhinum sp. , snap dragon, starch synthesis

Question 3

eg for co dominance

Answer 3

ABO blood group

Question 4

there are —— genotypes and ——– phenotype in human RBC

Answer 4

6,4

Question 5

eg for pleiotropy

Answer 5

Phenylketonuria
1. mental retardation
2. reduction in hair and skin pigmentation
starch synthesis gene in pea

Question 6

eg for Multiple alleles

Answer 6

ABO blood grp

Question 7

inheritance of two gene
Phenotype
Genotype
ratios

Answer 7

9;3;3;1
1;2;1;2;4;2;1;2;1

Question 8

who proposed chromosomal theory of inheritance

Answer 8

sutton and boveri

Question 9

experiment verification of chromosomal theory done by ?

Answer 9

TH Morgan, drosophila melanogaster

Question 10

eg of polygenic traits

Answer 10

human skin colour, height

Question 11

XO type eg

Answer 11

grasshopper

Question 12

ZW type eg

Answer 12

female heterogamety, birds

Question 13

sex determination in honey bee is a?

Answer 13

Haplo-diploid sex determination

Question 14

point mutation with eg

Answer 14

change in single base pair of DNA
eg; sickle cell anaemia

Question 15

eg for autosomal dominant

Answer 15

myotonic dystrophy

Question 16

eg for autosomal recessive

Answer 16

sickle cell anaemia

Question 17

all about colour blindness

Answer 17

sex linked recessive
8% of male and 0.4% of female

Question 17

Haemophilia

Answer 17

x linked recessive
single blood clotting protein is effected

Question 18

Phenylketonuria

Answer 18

Autosomal recessive
lack enzyme that converts phenylalanine to tyrosine
results in mental retardation

Question 19

thalassemia

Answer 19

autosomal recessive
alpha thalassemia on chromosome 16
beta thalasemia on chromosome chromosome 11

Question 20

Down syndrome

Answer 20

trisomy 21
Langdon down 1866

Question 21

klinefelters syndrome

Answer 21

karyotype 47
sterile individuals

Question 22

turners syndrome

Answer 22

monosomy 45
XO , sterile female

Question 23

% of recombination seen in yellow body white eye

Answer 23

1.3%

Question 24

% of recombination in white eye and miniature wing

Answer 24

37.2%

Question 25

cystic fibrosis is of which disorder

Answer 25

autosomal recessive