Practice Questions

TLS Online TPP Program

#Question id: 2885

Which of the following function of DNA methylation in mammalian cell is incorrect?

#Unit 2. Cellular Organization

The principal general function of DNA methylation in mammalian cells is to stabilize, or lock in, patterns of transcriptional silencing so that transcription is suppressed in highly methylated regions of chromatin.
One of these is the regulation of gene expression, and it is the extent of DNA methylation in the key trans-acting regulatory elements that distinguishes actively transcribing genes from silenced genes.
Highly repetitive DNA sequences, such as satellite repeats in pericentromeric heterochromatin and dispersed transposons, are extensively methylated, but there is also significant—though more sporadic—methylation in the main body (exons and introns) of genes and in intergenic regions.
Patterns of gene expression that defines the identity of cells or that allow just one of the two alleles to be normally expressed can be locked in by DNA methylation.

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TLS Online TPP Program

#Question id: 12167

#Unit 8. Inheritance Biology

If a cross is made between the two individuals such as,

The F1 shows the 512 individuals, contain the 2 individual shows maximum phenotype.

i) No. of QTLs

ii) No. of polygenes involved

iii) No. of phenotypes in F2 generation

iv) No. of genotypes in F2 generation

Calculate the given different values;

TLS Online TPP Program

#Question id: 12168

#Unit 8. Inheritance Biology

The proportion of the total phenotypic variation that is due to genetic differences is known as

TLS Online TPP Program

#Question id: 12169

#Unit 8. Inheritance Biology

During the phenotypic variations, the genotype shows variation at different effect given in graph;

According to the graph , this is an example of,

TLS Online TPP Program

#Question id: 12170

#Unit 8. Inheritance Biology

Sex determination in the grasshoppers is X-linked, if the cross is made between the heterozygous red phenotypic female with the heterogametic red phenotypic male , then what will be the ratio of male and female with the red phenotype in F1 generation?

TLS Online TPP Program

#Question id: 12171

#Unit 8. Inheritance Biology

In the case of recessive lethal, showing lethality with X^w. If the female grasshopper with the genotype (X^+ X^w) is cross with the male grasshopper with the genotype (X^+O) , then what will be the probability of showing lethality in male and female?

TLS Online TPP Program

#Question id: 12172

#Unit 8. Inheritance Biology

In haplodiploid condition, hymnoptera insects female mates with a single male , find the mean genetic relatedness of;

i) the females in the progeny are related to,

ii) the males in the progeny are related to,