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Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - NEET MCQ


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10 Questions MCQ Test - Test: Sex Determination & Chromosomal Theory of Inheritance (November 28)

Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) for NEET 2024 is part of NEET preparation. The Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) questions and answers have been prepared according to the NEET exam syllabus.The Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) below.
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Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 1

Which of the following animals rely on environmental factors for sex determination?

Detailed Solution for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 1

Turtles are one of the organisms which rely on environmental factors for sex determination completely. They usually depend upon temperature for this purpose.

Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 2

The chromosomal basis of sex determination was discovered by which of the following scientists?

Detailed Solution for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 2

The foundation of the chromosomal basis of sex determination was laid down by Henking in 1891. He studied a specific nuclear structure though spermatogenesis in a few insects.

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Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 3

Which of the following determines the sex of the offspring in male heterogametic conditions?

Detailed Solution for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 3

When the condition of male heterogamety is present, then sperm determines the sex of the offspring because two kinds of sperms are present, one with X-chromosome and the other with Y-chromosome. Eggs of an individual are the same as both of them contain 22+ X chromosomes.

Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 4

What is the probability of having a girl child in sixth pregnancy if the first five progenies are boys?

Detailed Solution for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 4

The probability of having a girl child in the sixth pregnancy, where the first five progenies were male is 50%. As humans show XY type of male heterogamety, where 50% sperms carry 22+ X chromosomes and the other 50% carry 22+Y chromosomes, therefore in each pregnancy there is 50% probability of either a male or a female child.

Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 5

The lack of publicity of Mendel’s work was due to _______

Detailed Solution for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 5

Mendel had published his work back in 1865. The communication methods were not well developed and for people to recognize the importance of his work took more than half a decade after it had been published.

Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 6

What approach used by Mendel was utterly new?

Detailed Solution for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 6

People had performed crosses on garden pea plants before Mendel. But no one had applied a statistical and probabilistic approach to unveil the underlying phenomena. Mendel was the first to do so.

Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 7

What were the colored bodies observed in the nucleus during the process of division called?

Detailed Solution for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 7

Chromosomes means colored bodies/objects. The staining procedures allowed biologists to visualize the nucleus and chromosomes during the process of cell division.

Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 8

What was the contribution of Correns, von Tschermak, and de Vries to Mendel’s work?

Detailed Solution for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 8

These three scientists helped in the rediscovery of Mendel’s work in the 1900s. Mendel’s work was published in 1865 and long forgotten.

Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 9

Chromosomes occur _________; genes occur _________

Detailed Solution for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 9

A diploid cell has double the set of chromosomal content. Hence there are two copies for each chromosome present. These are called homologous chromosomes. Now, genes are fragments of DNA present on the chromosomes. Hence they also occur in pairs, with one gene present on each homologous chromosomes.

Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 10

When does the first segregation of genes occur during meiosis?

Detailed Solution for Test: Sex Determination & Chromosomal Theory of Inheritance (November 28) - Question 10

Genes occur in pairs. At the start of meiosis, there are four copies of each gene. They are segregated first during Anaphase I, where each pole receives a pair of each gene.

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