XO-chromosomal abnormality in human beings causes
Turner's syndrome
Down's syndrome
Kilnefelter's syndrome
none of these.
Gene which suppresses other gene's activity but does not lie on the same locus is called as
epistatic
supplemetary
hypostatic
codominant
The distance between two genes in a chromosome is measured in cross-over units which represent
ratio of crossing over between them
percentage of crossing over between them
number of crossing over between them
none of these
How many genome types are present in a typical green plants cell?
More than Five
More than Ten
Two
Three
Percentage of recombination between A and B is 9%, A and C is 17%, B and C is 26%, then the arrangement of genes is
ABC
ACB
BCA
BAC
Which of the following conditions represents a case of co-dominance genes?
A gene expresses itself, suppressing the phenotypic effect of its alleles.
Genes that are similar in phenotypic effect when present separately, but when together interact to produce a different trait.
Alleles, both of which interact to produce a trait, which may or may not resemble either of the parental types.
Alleles, each of which produces an independent effect in a heterozygous condition.
Which of the following disorders are caused due to recessive autosomal mutations?
Turner's syndrome and sickle cell anaemia
Edward's syndrome and Down's syndrome
Cystic fibrosis and phenylketonuria
Alzheimer's disease and Huntington's chorea
Which of the following is correct ?
Henking discovered the small Y-chromosome.
Drosophila also shows XX-XY sex determination like human.
Birds have ZZ-ZW sex determination, where females are ZZ and males are ZW.
Grasshoppers show XX-XY sex determination.
Which of the following is true for a recessive disease in family A and B?
In family A, both the parents are homozygous recessive.
In family B, both the parents are homozygous dominant.
In family B, both the parents are heterozygous recessive.
In family A, both the parents are heterozygous recessive.
Which of the following occurs due to monosomy of sex chromosome?
Haemophilia
Sickle cell anaemia
In rabbits, the gene for grey fur (G) is dominant over that for black fur (g). In a litter, if 50% rabbits are grey, then the possible parental cross combination is
GG X Gg
GG X GG
gg X gg
Gg X gg.
Barr body is missing in the female suffering from
Huntington's disease
Tay-sach's disease
Klinefelter's syndrome
Which is genetically not possible?
Hemophilic father transfers the hemophilic gene to his son
Hemophiic father transfers the hemophilic gene to his daughter
Carrier mother transfers the hemophilic gene to her son
Carrier mother trannsfers the hemophilic gene to her daughter
Barr Body is found in the cytoplasm during
interphase in cell of female mammal
interphase in cell of male mammal
prophase in cell of female mammal
prophase in cell of male mammal.
If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
25%
100%
No chance
50%
If 'A' represents the dominant gene and 'a' represents its recessive allele, which of the following would be the most likely result in the first generation offspring when Aa is crossed with aa ?
All will exhibit dominant phenotype.
All will exhibit recessive phenotype.
Dominant and recessive phenotypes will be 50% each.
Dominant phenotype will be 75%.
In a pea plants, green pod colour is dominant over yellow pods. 1000 seeds taken from a pea plant on germination produces 760 green pod and 240 yellow pod plants. The parental genotype and phenotype of the seed plant are
Heterozygous and yellow
heterozygous and green
homozygous and yellow
homozygous and green
A colourblind man marry with a daughter of colourblind father, the generation will be
there will be no daughter colourblind
all sons will be colourblind
all daughter will be colourblind
half sons will be colourblind
In a plant, red fruit (R) dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTT genotype is crossed with a plant that is rrtt. Then
25% will be tall with red fruit
50% will be tall with red fruit
75% will be tall with red fruit
All of the offspring will be tall with red fruits
A man whose father is a colourblind, marry a woman, who is a daughter of colourblind mother. The offspring of this couple will be
all daugher and sons are colourblind
50% colourblind and 50% normal son
carrier normal daugher and colourblind sons
colourblind sons and normal daughter
A pea plant parent having violet-coloured flowers with unknown genotype was crossed with a plant having white-coloured flowers. In the progeny, 50% were white. The genotypic constitution of the parent having violet-coloured flowers was
homozygous
merozygous
heterozygous
hemizygous
The number of linkage group(s) present in Escherichia coli is
One
two
four
seven
In two pea plants having red (dominant) coloured flowers with unknown genotypes are crossed, 75% of the flowers are red and 25% are white. The genotypic constitution of the parents having red coloured flowers will be
both homozygous
one homozygous and other heterozygous
both heterozygous
both hemizygous
Genotypic and phenotypic ratios 1 : 2 : 1 in the offsprings explain the principle of
dominance
blending inheritance
recessiveness
All of the above
Sickle cell anaemia is example of
sex-linked inheritance
deficiency disease
autosomal heritable disease
infectious disease
Holandric genes are located
both in X and Y-chormosome
only in Y-chromosome
only in X-chromosome
only in autosomes
Which one of the following disorders and characteristic is correctly matched?
Cystic fibrosis - Produciton of thick mucous that cloge airways
Sickle cell anaemia - Brain deterioration beginning at months of age
Achondroplasia - Extra fingers or toes
Huntingon's disease - Skeletal, eye and cardiovascular defects
Tay-Sachs disease results due to lack of enzyme
glucokinase
hexosaminidase A
Pyruvate kinase
Na- — K+ ATPase
A woman is married for the second time. Her first husband was ABO blood type A, and her child by that marriage was type O. Her new husband is type B and their child is type AB. WHat is the woman's ABO genotype and blood type ?
IAIO; Blood type A
IAIB; Blood type AB
IBIO; Blood type B
IOIO; Blood type O
Who is known as father of physiological genetics or father of biochemical genetics ?
Slatyer
Charles Elton
Taylor
Archibald Garrod
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