Biology Answers

in order for a reccesive trait to show the genotype must be

Give three environmental factors that might affect the distribution of the green alga on the tree.

Explain the effects of bile in the digestion of lipids

Both plasma membrane (cell membrane) and nuclear envelop are bilayer.

A large molecule like RNA can pass through which of the above membrane? Explain why.

Describe tha comparative anatomy of skin of amphibia and mammal

In tomatoes, red fruit is dominant to yellow fruit and hairy stems are dominant to hairless (smooth) stems. The two genes controlling these traits are inherited in normal Mendelian fashion and are not linked.

a)   Produce a suitable key for this information in terms of the individual alleles of the genes given.                                                                                 

b)   What are the possible genotypes of plants showing the following forms:    

i)              Red fruit and smooth stems

ii)             Yellow fruit and hairy stems

iii)           Red fruit and hairy stems 

What is ecosystem

Choose the right answer:

1-there is editing in rRNA also

2-editing occurs by Intron splicing

3-editing means the correctians of the mistakes in mRNA sequence

4-maturation of mRNA occurs in the cytoplasm

5-information content of RNA Can be changed by editing

In a different species of plant, the bell-shaped flower is dominant to tube-shaped flower and the gene controlling this trait is inherited in normal Mendelian fashion. Flower colour can be either red, white, or in combination pink. The two genes are not linked.

Give a reasoned explanation along with the use of full genetic diagrams to proof your answer, to explain in terms of the simultaneous transmission of characteristics, the possible outcomes of crossing a heterozygous bell flowered plant with pink flowers, and a tube flowered plant with white flowers. You should also clearly identify the phenotypic combinations that are not possible from this cross.

explain it clearly, please.          

Does crossing two plants, each heterozygous for two traits, always produce a phenotypic ratio of 9:3:3:1 in the offspring? A) Yes, unless there are linked genmes, incomplete dominance, or, in animals, sex chromosomes involved. B)Yes, regardless of the situation. C) No, because the results of each cross are completely random D) None of these is correct