- 1(current)
Q. No.Total number of autosomes will be the same in:
| I. | Male and female humans |
| II. | Male and female birds |
| III. | Male and female Drosophila |
| IV. | Male and female grasshopper |
| 1. | Only I, II, and III | 2. | Only I, II, and IV |
| 3. | Only II, III, and IV | 4. | I, II, III, and IV |
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Select the incorrect statement:
| 1. | Human males have one of their sex-chromosome much shorter than the other. |
| 2. | Male fruit fly is heterogametic. |
| 3. | In male grasshoppers, 50% of sperms have no sex chromosome. |
| 4. | In domesticated fowls, the sex of progeny depends on the type of sperm rather than the egg. |
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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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A woman receives her X chromosomes from:
1. her mother only
2. her father only
3. both her mother and her father
4. extranuclear DNA in her mother's egg
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The sex of the fetus is determined:
| 1. | at the time of fertilization by the type of sperm fertilizing the ovum. |
| 2. | at the time of fertilization by the female parent as she always produces an egg with an X chromosome. |
| 3. | at the time of implantation due to the secretion of TDF by the fetal testes. |
| 4. | at the time of implantation due to the secretion of ODF by the fetal testes. |
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Identify the incorrect statement regarding the various methods of sex determination in living organisms:
| 1. | A male grasshopper has an odd number of chromosomes in its somatic cells. |
| 2. | A person with Klinefelter syndrome will be genotypically female. |
| 3. | In butterflies the female flies are diploid while the male flies are haploid. |
| 4. | A fruit fly with two X chromosomes and two sets of autosomes will be a fertile female. |
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A woman has four daughters. The chance that her next child will be a son is:
| 1. | 1 | 2. | 0 |
| 3. | \(1 \over 2\) | 4. | \(1 \over 4\) |
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In a certain taxon of insects, some have 17 chromosomes and others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:
1. males and females, respectively
2. females and males, respectively
3. all males
4. all females
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- 1(current)
Q. No.
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