Q. No.What is applicable to both Klinefelter’s syndrome and Turner’s syndrome?
I.
They result from the non-disjunction of sex chromosomes during gamete formation
II.
They can be identified by a karyotype
III.
They have 44 autosomes
1. I and II only 2. I and III only 3. II and III only 4. I, II, and III
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An exchange of segments between non-homologous chromosomes is called as:
1. Crossing over
2. Inversion
3. Reciprocal translocation
4. Transposing
If a father and son are both affected by red-green colour blindness, then what can be said definitely?
| I. | The son has received the trait from the father. |
| II. | The mother of the affected son has to be affected by red-green colour blindness. |
| III. | Any sister of the affected son can never be affected by red-green colour blindness. |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | None |
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If individuals of genotype AaBbCc are intercrossed, how many different phenotypes can appear in their offspring?
| 1. | 3 | 2. | 6 |
| 3. | 8 | 4. | 9 |
A man of which of the following blood groups could not be the father of a group O child?
1. A
2. B
3. O
4. AB
Two garden pea dihybrids with round seed shapes and yellow seed color [RrYy] are intercrossed. Assuming independent assortment, the gene for seed shape is inherited by the progeny in a phenotypic ratio of:
| 1. | 3: 1 | 2. | 1: 1 |
| 3. | 9:3:3:1 | 4. | 1:1:1:1 |
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The gene for the enzyme Phenylalanine hydroxylase is located on chromosome:
1. 7
2. 11
3. 12
4. X
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Consider the following statements regarding
Y chromosome in humans:
| I. | Y chromosome is a male-determining chromosome in humans |
| II. | Y chromosome contains a gene, SRY, which triggers embryonic development as a male |
| III. | 50 % of sons of a male inherit his Y chromosome |
Of the given statements, the correct statements are:
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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Mating between black rats of identical genotype produced offspring as follows: 14 cream colored, 47 black and 19 albino. This ratio can be explained if the pheneomenon exhibited here is:
1. Recessive epistasis
2. Polygenic inheritance
3. Multiple allelism
4. Incomplete penetrance
Identify the incorrect statement regarding test cross?
1. It is used to determine the genotype of an individual exhibiting a dominant phenotype.
2. The testcross parent is always homozygous recessive for all of the genes under consideration.
3. The purpose of the testcross is to discover how many different kinds of gametes are being produced by the individual whose genotype is in question.
4. A homozygous dominant individual will produce two types of progeny and a heterozygous individual will produce only one type of progeny.
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