CBSE
When mendel self-hybridised the F1 plants of genotype RrYy, in the F2 generation they yellow and green colour segregated in the ratio
1 : 2 : 1
3 : 1
9 : 3 : 3 : 1
1 : 1
1 : 1
An example for codominance
Eye colour in Drosophila
Seed shape and colour in pea plants
ABO blood group in man
Haemophilia in man
Haemophilia in man
The disorder caused by point mutation is
Down's syndrome
Sickle cell anemia
Klinefelter's syndrome
Tetany
Tetany
In sickle cell anemia, the sequence of amino acids from the first to the seventh position of the b-chain of haemoglobin S(HbS) is
His, Leu, Thr, Pro, Glu, Val, Val
Val, His, Leu, Thr, Pro, Glu, Glu
Thr, His, Pro, Val, Pro, Val, Glu
Glu, His, Leu, Pro, Val, Glu, Glu
Glu, His, Leu, Pro, Val, Glu, Glu
Identify the scientists from the hints given below
Morgan and Correns
De Vries and Boveri
Brides and Correns
Bridges and Sutton
Bridges and Sutton
TT : Tt : tt is the binomial expansion of
Two pink flowered snapdragon plants(Rr) are self-pollinated. The probability of the off springs to have white flowers are
25%
50%
75%
2.5%
2.5%
Which of the following disorder is caused by autosomal aneuploidy?
Down's syndrome
Haemophilia
Sickle cell anemia
Phenylketonuria
Phenylketonuria
Choose the wrong statement
In grasshopper, besides autosomes males have only one X-chromosome, whereas females have a pair of X-chromosomes.
In XY type of sex determination, both males and females have same number of chromosomes.
In Drosophila, males have one X and one Y chromosome, whereas females have a pair of Xchromosome besides autosomes
In birds, females have one Z and one W chromosomes, whereas males have a pair of Z chromosomes besides autosomes
In birds, females have one Z and one W chromosomes, whereas males have a pair of Z chromosomes besides autosomes
Choose the wrong statement
Failure of segregation of chromatids during cell division results in aneuploidy
Additional copy of 'X' chromosome in males results in Klinefelter's syndrome
Closely located genes in a chromosome always assert independently resulting in recombinants
According to Mendel, recessive character never blend in heterozygous condition
According to Mendel, recessive character never blend in heterozygous condition