Looking for classes? Ksquare Career Institute, Bengaluru →
Principles of Inheritance and Variation
Sex Determination
5 questions from 5 papers, each with its answer.
- questions
- 5
- papers
- 5
- years asked, 2017–2026
- 2 of 10
- of Principles of Inheritance and Variation
- 2.53%
Appears in
Concepts tested
- Role of Y in humans versus Drosophila
- Sex determination
- sex determination in different organisms
- Types of sex determination
- XO type of sex determination
All Questions
2022 1 question
-
XO type of sex determination can be found in:
2019 1 question
-
Select the incorrect statement.
2019 Odisha 1 question
-
Match the items of Column I with Column II. Select the correct option.
Pick the matching item from Column II for each row.
Column I
- A. XX-XO method of sex determination
- B. XX-XY method of sex determination
- C. Karyotype-45
- D. ZW-ZZ method of sex determination
Column II
- I. Turner's syndrome
- II. Female heterogametic
- III. Grasshopper
- IV. Female homogametic
Correct answer: A → III, B → IV, C → I, D → II
2011 AIPMT-PRE 1 question
-
Which one of the following conditions correctly describes the manner of determining the sex in the given example?Grasshopper has XO type sex determination: females have a pair of X chromosomes (XX) and males have only one X chromosome (XO), so XO determines the male sex. This is correct.
In $Drosophila$, XX individuals are females and XY individuals are males.
In birds the females are heterogametic (ZW) and the males are homogametic (ZZ), so ZZ determines the male sex.
In humans sex is determined by the XX–XY mechanism; XO (Turner's syndrome) is an abnormal condition (a sterile female with rudimentary ovaries) and is not the manner in which female sex is normally determined.
Hence the correct description is that the XO type determines male sex in grasshopper.
2000 AIPMT 1 question
-
In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klinefelter's syndrome in male. It proves :In Drosophila, sex is decided by the ratio of X chromosomes to sets of autosomes (genic balance). XXY with two sets of autosomes has X/A = 1, so it is female; the Y chromosome does not decide sex.
In humans, XXY individuals are male (Klinefelter's syndrome), because the Y chromosome carries the SRY gene that determines maleness, regardless of the number of X chromosomes.
So this proves that in human beings the Y chromosome is active in sex determination.