Biology today

variable expressivity The genes which do not have similar expression in the individuals possessing them, have variable expressiv ...

Pattern baldness, moustaches and beard in human males are examples of (a) sex linked traits (b) sex limited traits (c) sex infl ...

Three alleles namely Ia, Ib and i control the blood grouping in human beings. How many different genotypes are likely to be pre ...

Short Answer Type Questions How many phenotypes of human skin colour are possible if two individuals of intermediate skin colou ...

medicine has been a male-dominated profession because it demands long working hours that are disadvantageous to women who, even ...

chApTer-5 : prINcIpLeS OF INherITANce AND VArIATION Multiple choice Questions In a dihybrid test cross when double heterozygote ...

True or False Genes which code for a pair of contrasting traits are known as alleles. Recessive allele is able to express itsel ...

Assertion : The blood groups are determined by two types of antibodies present on the surface of red blood cells. Reason : The ...

chApTer-6 : MOLecULAr BASIS OF INherITANce Multiple choice Questions DNA consists of two complementary polynucleotide chains. I ...

Portion of DNA called cistron specifies the formation of a particular polypeptide. Match The columns Match Column I with Colu ...

Refer to the given figure and answer the following questions. A B C (a) Identify A, B and C in the given figure. (b) Write dow ...

The new world monkeys possess a narrow nose with closely placed and downwardly directed nostrils. Increase in the number of chr ...

Figure Based Questions Refer to the given figure and answer the following questions. Peak gets higher and narrower Two peaks f ...

(b) In the given figure, W represents deletion which is a type of chromosomal aberration. It is the loss of an intercalary segme ...

false : The new world monkeys possess a flat nose with widely separated and outwardly directed nostrils. false : Increase in th ...

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• Growth and reproduction are characteristics of cells, of all living organisms. each parental cell gives rise to two daughte ...

• These processes are: Replication of DNA, along with the synthesis of basic nuclear proteins such as the histones. In anima ...

• The cells remain metabolically active. • They usually grow in size, assume particular shape and come to have a particula ...

• a critical complex activated during this process is a ubiquitin ligase known as the anaphase promoting complex (APC), which ...