Trisomy X and Other Conditions

Q. A diploid female plant and a tetraploid male plant are crossed. The ploidy of endosperm shall be

1. Tetraploid
2. Triploid
3. Pentaploid.
4. Diploid

Q. The number of chromosomes in human male and female are equal?

Q.

What is the significance of polyploidy plants ?

Q. Which of the following statement(s) is/are incorrect?
(i) Endosperm formation starts prior to first division of zygote
(ii) Angiospermic endosperm is mostly triploid while gymnospermic is haploid
(iii) The most common type of endosperm is nuclear
(iv) Coconut has both liquid nuclear (multinucleate) and cellular endosperm
(v) Green tender coconut water is liquid female gametophyte

1. (i) and (ii)
2. only (iii )
3. only (v)
4. only (ii)

Q. A tri-hybrid cross is made between two yeasts, both with genotypes Aa Bb Cc. What proportion of the offspring will be of genotype aabbcc?

1. 0
2. 1/4
3. 1/16
4. 1/64

Q. Explain the monisporic development of female gametophyte

Q. Match Column-I with Column-II and select the correct option from the codes given below :-

	Column-I		Column-II
a	Multiple alleles	(I)	Phenylketonuria in humans
b	Polygenic inheritance	(II)	Blood groups in humans
c	Pleiotropy	(III)	Skin colour in humans

1. a-III, b-II, c-I
2. a-II, b-I, c-III
3. a-I, b-II, c-III
4. a-II, b-III, c-I

Q. Go through the following statements
(i) Chromosomal aberrations are commonly observed in the cancer cells.
(ii) The possibility of a female becoming a haemophilic is extremely rare because mother of such a female has to be at least carrier and the father should be haemophilic.
(iii) All the daughters of a couple exhibiting sickle- cell trait, will suffer from sickle – cell anaemia.
(iv) Myotonic dystrophy is an autosomal recessive trait.

Find the out the correct statements,

1. (i), & (ii)
2. (i), (ii), & (iii)
3. (ii) & (iv)
4. All are correct

Q.

• What is phragmoplast?
• What is interzonal microtubules?

Q. In funaria , 20 chromosome are present in rhizoids, then the no. Of chromosome in calyptra, theca & foot will be ?

Q.

Why is cytogenetics important in our life?

Q. Chromosome duplication without nuclear division refers to

1. meiosis
2. mitosis
3. androgenesis
4. endomitosis

Q. Assertion: A patient with phenylketonuria has skin pigmentation, mental retardation, and reduction in hair

Reason: In phenylketonuria, phenylalanine is converted into tyrosine which leads to absence of phenylalanine in the body

1. Both assertion and the reason are true and the reason is a correct explanation of the assertion
2. Both the assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false
4. Both the assertion and reason are false

Q. What is the ploidy level of nucellus, MMC, functional megaspore and female gametophyte?

1. 2n, n, 2n, 2n
2. 2n, n, 2n, n
3. 2n, 2n, n , n
4. n, 2n, n, n

Q.

What is aneuploidy?

Q.

Each species has a characteristic set of chromosome number called

1. Polyploid

2. Aneuploid

3. Euploid

4. Monoploid

Q. Width/distance between two strands of DNA is

1. 
2. 
3. 
4. 

Q.

What is the difference between chromosome and chromatid?

When do we have to use these two terms? Give the explanation with diagrams.

Q.

chromosomes no. in meiocytes ( diploid , 2n ) and gametes ( haploid , n ) of house fly , rat , dog , cat , fruit fly , ophioglossum ( a fern ) , apple , rice , maize , potato , butterfly , onion

Q. Which of the following nutrient is incorrectly matched with the deficiency disease it causes?

1. Iron deficiency - Anemia
2. Zinc deficiency - Alopecia
3. Vitamin A deficiency - Nightblindness
4. Iodine deficiency - Scurvy

Q. Gyanandromorphs appear in Drosophila because of

1. gain of Y-chromosome
2. loss of X-chromosome
3. autosomal loss
4. mutation

Q.

What is Triticale?

1. It is a new plant produced by selection.

2. It is a wild ancestral wheat.

3. It is a modified form of wheat.

4. It is an intergeneric hybrid

Q. In humans, sex differentiation starts

1. in the ovum
2. fourteen weeks after pregnancy
3. just before parturition
4. around $7^{\mathrm{th}}$ week of embryonic life

Q. Statement1: Monozygotic twins have a similar fingerprint pattern but not identical.
Statement 2: As the number of foetuses increases from twin, triplet, quadruplet, the expected duration of pregnancy decreases

Choose the correct option.

1. Both the statements are true
2. Statement 1 is true and statement 2 is false
3. Statement 1 is false and statement 2 is true
4. Both the statements are false

Q. Autopolyploids (numeric or quantitative polyploids or intraspecific polyploids) like ferns, garden plants, Gram, Maize, Rice, Banana, Grapes, Apple, etc. show

1. reduce size
2. gigas effect
3. all of the above
4. faster rate of cell division

Q. When the chromosome number of a given organism has one additional chromosome in one of the homologous pairs, the condition is known as

1. Trisomy
2. Monosomy
3. Polyploidy
4. Nullisomy

Q.
Which of the following is used in somatic hybridization to fuse two somatic protoplasts?

1. IAA
2. Polyethylene glycol
3. Pectinase
4. Colchicine

Q. Inheritance of skin colour in human being is an example of

1. Point mutation
2. Co-dominance
3. Chromosomal aberration
4. Polygenic inheritance

Q. A man with blood group 'A' marries with blood group 'B'. what are all the possible blood groups of their offsprings?

1. O only
2. A and B only
3. A, B and AB only
4. A, B, AB and O

Q. What would be number of chromosomes in aleurone layer if megaspore mother cell contains 10 chromosomes?

1. 10
2. 20
3. 15
4. None of the above