Companion cells in minor veins of mature leaves. All three cell types have dense cytoplasm and abundant mitochondria, there are three types companion cells  present in column A while its characteristics given in column B;

             COLUMN A                                                             COLUMN B

A) Ordinary companion cells              i) appear well suited for taking up solutes via cytoplasmic connections numerous plasmodesmata connecting them to bundle sheath cells. Its having numerous small vacuoles, as well as poorly developed thylakoids.

 

B) Transfer cells                                    ii) have chloroplasts with well-developed thylakoids     and a cell wall with a smooth inner surface. The number of plasmodesmata connecting ordinary companion cells to surrounding cells.

C) Intermediary cells                          iii) the development of fingerlike wall in growths, particularly on the cell Walls. These wall ingrowths greatly increase the surface area of the transfer cell’s  plasma membrane, few plasmodesmata connect this type of companion cell to any of the surrounding cells except its own sieve element.

Which of the following correct combination;

#Question id: 3332

#Section 3: Genetics, Cellular and Molecular Biology

The frequencies of alleles 'H' and 'h' in a population at Hardy- Weinberg equilibrium are 0.6 and 0.4, respectively. In a random sample of 1000 individuals taken from the population, how many are expected individuals carry H allele?

#Question id: 3333

#Section 3: Genetics, Cellular and Molecular Biology

The flipper of whale and the wings of bats represent a case of

#Question id: 3334

#Section 3: Genetics, Cellular and Molecular Biology

Red hair is a dominant trait in human. In a randomly mating population in Hardy-Weinberg equilibrium approximately 91% of individuals are red- haired. What is the frequency of the recessive allele?

#Question id: 3335

#Section 3: Genetics, Cellular and Molecular Biology

Consider hypothetical populations that have arisen from the mixing of migrants from different sources: f(AA)- 0.30   f(Aa)- 0.0     f(aa)- 0.70 After one generation of random mating within population, what will be genotypic frequencies?

#Question id: 3336

#Section 3: Genetics, Cellular and Molecular Biology

There are 4 alleles at a given locus in a diploid population and all alleles are equal abundant. What is the proportion of all homozygotes in the population?

#Question id: 3337

#Section 3: Genetics, Cellular and Molecular Biology

Small populations are threatened by a least loss of genetic variability is due to