CHAPTER-8- HERIDITY WORKSHEET 1
CHAPTER-8- HERIDITY
WORKSHEET (VOLUME-1)
CLASS :X
SUBJECT: SCIENCE(086)
MAXIMUM MARKS : 15
MARKES OBTAINED:……
NAME OF STUDENT:……………………………….
ROLL NO. ……………
SECTION A
- A zygote which has an X-chromosome inherited from the father will develop into:
a) Boy
b) Girl
c) Either boy or girl
d) Cannot be determined
ANS:………………………………………………………………………… - Which one of the following statements is NOT true?
(a) DNA carries the information for inheritance of features from parents to the next generation.
(b) DNA is the information source for making Proteins
(c) Changes in the information leads to different proteins
(d) Features will remain the same even if the protein changes .
ANS: ………………………………………………………………….. - Who is known as the Father of Genetics?
a) Watson
b) Crick
c) Mendel
d) Darwin
ANS………………………………………………………………………. - Consider the following statements:
(i) The sex of a child is determined by what it inherits from the mother.
(ii) The sex of child is determined by what it inherits from the father .
(iii) The probability of having a male child is more than that of a female child.
(iv) The sex of a child is determined at the time of fertilization when male and female gametes fuse to form a zygote.
The correct statements are
(A) (i) and (iii)
(B) (ii) and (iv)
(C) (iii) and (iv)
(D) (i),(iii) and (iv) - Assertion (A) : A human child bears all the basic features of human beings.
Reason (R) : It looks exactly like its parents, showing very little variations
ANS: …………………………………………………………………………………………
SECTION B
- Pure -Tall (TT) pea plants are crossed with pure Dwarf (tt) pea plants. Pea plants obtained in F1 generation are then self pollinated to produce F2 generation .
(i) What do the plants of F1 generation look -like? Justify your answer.
(ii) What is the ratio of Pure -tall plants to pure dwarf plants in F2 generation?
ANS……………………………………………………………………………………………………………………
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……………………………………………………………………………………………………………….. - Explain how equal genetic contribution of male and female parents is ensured in the progeny.
Or
It is a matter of chance whether a couple will give birth to a male or female child’. Justify this statement with the help of a flow chart showing the fusion of sex chromosome.
ANS:
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………………………………………. - A woman with blood group O married a man with AB group. Show the possible blood groups of progeny. List the alleles in this inheritance.
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……………………………………. - State the meaning of Acquired and inherited traits. Which of the two is not Passes on the Next generation? Explain with the help of Example.
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………………………………… - The gene combination of purple flowered pea plants is denoted as (WW) and that of white flowered pea plants as (ww), when these two plants are crossed F1 generation is obtained.
(a) List two observations made by Mendel in F1 generation plants.
(b) Give the (i) percentage of white flowered plants and (ii) ratio of the gene combination WW, Ww and ww in F2 generation..
ANS:
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MARKING SCHEME
| Q | ANSWER | MARKS |
|---|---|---|
| 1 | b) Girl | 1 |
| 2 | (d).Features will remain the same even if the protein changes | 1 |
| 3 | c) Mendel | 1 |
| 4 | B (ii) and (iv) | 1 |
| 5 | The assertion is true, but the reason is false. | 1 |
| 6 | In the F1 generation, all plants will appear tall because the tall allele (T) is dominant over the dwarf allele (t). In the F2 generation, the ratio of pure tall (TT) to pure dwarf (tt) plants will be 1:1 | 1+1 |
| 7 | The sex of a child is determined by the sex chromosomes contributed by the parents during fertilization
|
½*4 |
| 8 |
|
½*4 |
| 9 | Acquired traits are characteristics developed during an individual's lifetime due to environmental factors or experiences, while inherited traits are characteristics passed down from parents to offspring through genes. Acquired traits cannot be passed on to the next generation. Ex driving skill., playing instruments. | ½*4 |
| 10 | In Mendel's F1 generation all offspring had purple flowers. Dominant traits are expressed with only one allele In the F2 generation, 25% of the plants had white flowers, WW: Ww: ww gene combinations was 1:2:1. | ½*4 |
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