12/6/22
Genetics
1) Explain with the help of a chart what will be the colour of a child's hair if father has got dominant gene for black hair and mother has got recessive gene for brown hair.
2) What is Genetic engineering ? Write it's importance for mankind.
3) Write short notes on the following:
a) genetic counselling.
b) Genetics.
c) law of inheritance.
d) Genes.
e) identical twins.
f) law of dominance.
g) law of segregation.
h) law of independent assortment.
i) Variation
j)
4) What is the number of sex chromosomes in human being ?
5) What is the chemical composition of Genes ?
6) Justify the statement "the sex of the child depend on its father".
7) Mention if the following statements are true or false :
a) Somatic cells of female have XY pair of sex Chromosome.
b) Genes are functional unit of chromosome.
c) Any gene that produces an effect in the heterozygous condition is called dominant.
d) the male gametes in human beings are only one type.
e) Genetics and heredity are one and the same thing.
8) Distinguish between the following pairs:
a) Homozygous/heterozygous.
b) dominant and recessive genes.
c) phenotype and genotype.
d) heredity and genetics.
9) Draw a Pedigree chart for one generation taking free ear lobe in female and attached ear lobe in male. state if four children are born (2 sons and 2 daughters) how many will be with free ear lobes and how many with attached ear lobes, if free ear lobe is the dominant character ?
1) Homologous chromosomes
2) sex of a child depends upon father. Explain.
3) Define pedigree chart.
In peas tallness is dominant over dwarfness. What will be the nature of the progeny when Hybrid tall plant is cross bred with a hybrid tall ?
4) A mala child would be born to parents if:
a) Father is healthier than mother.
b) Genetical chromosomal constitution of child is XX.
c) Genetical chromosomal constitution of child is XY.
d) Mother feeds well during pregnancy.
5) If two opposite alleles come together one finding morphology expression masking the other, the fact is described as law of
a) Inheritance b) dominance
c) limiting factors
d) segregating
6) Name which is act as bearer of hereditary units.
7) State Mendel's law of dominance.
8) what is a dihybrid ratio.
9) define phenotype.
10) what are autosomes.
11) Name the genetic constitution of an organism.
12) Define alleles.
Eye
1) Where does the far point of a normal eye lie? Where does it lie in a person suffering from myopia.
2) Draw a ray diagram to show how the defect of Myopia can be remedied by using suitable lens.
3) a) Which is the most sensitive part of the retina.
b) Which is the most insensitive part of the retina?
c) Why is choroid coated black
d) what is the function of ciliary muscles
4) What are far-point and near-point of the eye? At what distance they are situated for normal eye? How they effected for a short-sighted person?
5) Draw outline ray diagram to show the formation of images through an eye in the following cases:
A) from a distant object for a short-sighted person
B) from the normal point of distinct vision for a long-sighted person.
6) a) A student sitting at the back of a class, finds difficulty in reading the black board. However, he can read his book comfortably. From what defect of vision is he suffering? What is the cause of this effect?
b) What spectacle lens should the student use to correct this defect?
c) what type of lenses are used in the spectacle worn by old people for reading?
d) which part of the eye-ball helps in the power of accomodation and how?
7) a)Draw the course of rays through myopic eye. Give reasons for the cause of myopia.
b) how is the defect of short-sightedness removed?
8) Draw an outline diagram of the human eye and name it's different parts which contribute to the faulty of sight. Give their functions. What is most and least sensitive.
9) A person can see clearly on the television screen but can not read a newspaper easily.
A) name the defect with which he is suffering
B) what is the cause of the above defect
C) name the lens which corrects the above defect
D) draw the course of rays connecting the defect.
10) What makes the eye-lens to adjust its focal length.
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