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The signal for parturition originate from:

Wall of anther is composed of four layers in which:

Ploidy level of Embryosac, Megaspore mother cell and nucellus is respectively:

In generic engineering, Agrobacterium and retro virus are used as a vector for cloning genes in plants and animals, because:

Calvin Bridge satated that instead of XY chromosomes , sex is determind by the genic balance. What would be the sex of drosophila having XX +3A & XY +3A karyotpe respectively :

All the given statement are correct regarding the phenomenon of linkage, except:

Given below is a pedigree of a family suffering from a genetical disorder.

After observing the inheritance pattern, find out that which of the following disorder can produce such type of pedigree?

Flower colour is purple in sweet pea due to non-allelic interaction between two dominant genes C & P. plant with CCpp genotype will have which of the following correct explanation?

a-Flower colour is white

b- No synthesis of chromagen

c- Raw materials are metabolised into chromagen

d- Chromagen metabolism will be further stopped

e- Crossing with heterozygous purple flowered plant will yield equal percentage of purple and white flowered plants.

Many bacteria are now resistant to penicillin because

This graph indicate which type of natural selection:

Which of the following hormones is not secreted by placenta?

Male sex organ is stamen and the female sex organ is carpel or pistil in these plants. They produce female gametophyte made of egg apparatus, antipodal cells and polar nuclei and male gametophyte made of tube cell and two male gametes. Which of the following is also a very important unique event occuring in these plants:

Epicotyl is:

If we ligate a foreign DNA at the Bam HI site in pBR322, then the recombinant plasmid will:

X-linked recessive gene easily expresses itself in?

In Drosophila, the following crossing over percentages were found between the given genes:

Gene Gene C.0%

a b 2.8

a c 7.8

d b 8.0

d c 3.0

What is the order of these genes?

If the modified allele produce normal enzyme then which statement is not true?

Chief agent of variation:

Mismatch is:

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