Q5 of 40 Page 15

Observe the flow-chart of a monohybrid cross in a clitoria plant and write the answers for A, B, C, D





A = gametes for F1 generation that are B and b.


B = F1 generation go on selfing and form gametes for F2 generation that are B, B, b and b.


C = phenotypic ratio that is


blue flowered : white flowered = 3:1


D = genotypic ratio that is


BB : Bb : bb = 1:2:1


More from this chapter

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1

Human evolution has undergone a record of changes during the past 15 million years.

i) Name the different species of mankind in chronological order from primitive to modern man.


ii) When were the primitive caves developed?


iii) Narrate the life led by an early man-like hominids.

 2

Describe in brief Mendel’s monohybrid cross.

 3

Find out who I am?

i) I am an acid used as a preservative and I have a sour taste.


ii) I am organic and present in citrus fruits and I give immunity.


iii) I am a cholesterol containing steroid obtained from bread mould. I am the steroid.


iv) I am an enzyme and I cut DNA at specific sites.


v) I am the paste enzyme that joins segments of DNA.

 4

State whether true or false. Correct the statements that are false.

i) Variations give the organisms an individuality of their own.


ii) Charles Darwin postulated the use and disuse theory.


iii) To understand evolution, a branching diagram or a tree diagram is used to show the inferred evolution and the relationship among various biological species.


iv) Genetic engineering is the modification of the genetic information of living organisms by manipulation of DNA by adding, removing or repairing part of the DNA and changing the phenotype