Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
the discrete unit controlling a particular character is called a factor
Out of one pair of factors, one is dominant and the other recessive
Alleles do not show any blending and both the characters recover as such in F2 generation
Alleles do not show any blending and both the characters recover as such in F2 generation
C.
Alleles do not show any blending and both the characters recover as such in F2 generation
The law of dominance does not occur universally. After Mendel, several cases were recorded by scientists, where a clear deviation from the law of dominance was seen. Such a deviation may be seen in the form of Incomplete dominance or Blending inheritance Co-dominance.
Where F1 hybrids exhibited a mixture of blending or character of two parents, the case is considered as that of incomplete dominance blending inheritance. It simply means that two genes of an allelomorphic pair are not related as dominant or recessive, but each of them expresses itself partially. In the case of 4 o' clock plant, when plants with red flowers are crossed with plants having white flowers are crossed with plants having a white flower, the F1 hybrids bear a pink flower. When these pink flowers are self-pollinated, they develop red, pink and white flowers in the ratio of 1: 2:1 respectively.
C4 plants are more efficient in photosynthesis than C3 plants due to
higher leaf area
the presence of a larger number of chloroplasts
the presence of thin cuticle
the presence of thin cuticle
Heartwood differs from sapwood in
Presence of rays and fibres
the absence of vessels and parenchyma
having dead and non-conducting elements
having dead and non-conducting elements
Consider the following four statement (1-4) regarding kidney transplant and select the two correct ones out of these
1) Even if a kidney transplant is proper the recipient may need to take immuno- suppressants for a long time
2)The cell-mediated immune response is responsible for the graft rejection
3) The B-lymphocytes are responsible for rejection of the graft
4) The acceptance of rejection of a kidney transplant depends on specific interferons
The two correct statements are
(2) and (3)
(3) and (4)
(1) and (3)
(1) and (3)
Coiling of garden pea tendrils around any support is an example of
thigmotaxis
thigmonasty
thigmotropism
thigmotropism
Which stages of cell division do the following figures A and B represent respectively?
Metaphase - Telophase
Telophase - Metaphase
Late anaphase - Prophase
Late anaphase - Prophase
In vitro fertilisation is a technique that involves the transfer of which one of the followings into the Fallopian tube?
Embryo only, up to 8 cells stage
Either zygote or early embryo up to 8 cell stage
Embryo of 32 cells stage
Embryo of 32 cells stage
The genetically - modified (GM) brinjal in India has been developed for
insect - resistance
enhancing self- life
enhancing mineral content
enhancing mineral content
Sertoli cells are found in
Ovaries and secrete progesterone
adrenal cortex and secrete adrenalin
seminiferous tubules and provide nutrition to germ cells
seminiferous tubules and provide nutrition to germ cells
