Sex Determination in Human Beings

Q. How many autosomes are present in a human gamete?

1. 22
2. 23
3. 44
4. 46

Q. Assertion (A): Sex in all the living organisms is not genetically determined.

Reason (R): In snails, individuals can change sex, indicating that sex is not genetically determined.

1. Only A is correct.
2. Only R is correct.
3. Both A and R are correct but R is not the correct explanation for A.
4. Both A and R are correct and R is the correct explanation for A.

Q.

An example of an organism in which females are heterogametic and males are homogametic is:

1. Birds

2. Human beings

3. Ants

4. Honeybees

Q.

Selective sex abortion is made illegal under law because ……………………

1. it leads to many sexually transmitted diseases

2. it increases corruption in medical profession

3. male population would decrease in society

4. it disturbs the female-male sex ratio

Q. Choose the correct statement regarding chromosomes.

Statement 1: The number of chromosomes in parents and offsprings of a particular species remains constant.

Statement 2: Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half.

1. Both the statements are correct
2. Both the statements are incorrect
3. Statement 1 is correct
4. Statement 2 is correct

Q.

An example of an organism in which females are the heterogametic sex and males are homogametic is:

1. Birds

2. Human beings

3. Ants

4. Honeybees

Q. Explain the sex determination in human beings.

Q. Explain the mechanism of sex-determination in humans.

Q. In somatic cells of human beings, the chromosomes are found in _____ pairs.

1. 22
2. 46
3. 23

Q.

In human beings, sex of an individual is determined ___.

1. during the initial stages of pregnancy

2. at the time of fertilization

3. during the later stages of pregnancy

4. by the environment

Q. How does sex determination take place in human beings?

Q. When will sex determination in human takes place?(please explain me reason)

A)During fission of unfertilized egg
B})When fertilized ovum takes place
C)During fertilization
D)During sexual intercourse

Q. Which one of the following conditions correctly describes the manner of determining the sex in the given examples?

1. Homozygous sex chromosomes produce male in Drosophila
2. Homozygous sex chromosomes (ZZ) determine female sex in birds
3. XO type of sex chromosomes determine male sex in grasshopper
4. XO condition in humans as found in Turner syndrome determines female sex

Q.

Chromosomes that control body characteristics are called as __________

1. Body chromosomes

2. Autosomes

3. Sex chromosomes

4. Total chromosomes

Q. When a sperm containing Y chromosome fertilises an egg with X chromosome, the zygote develops into a ______ child.

1. Female
2. Either male or a female
3. Male
4. No child

Q. When a sperm containing Y chromosome fertilizes an egg with X chromosome, the zygote develops into a .......... child.

1. Female
2. Either a male or female
3. Male
4. No child

Q. A zygote which has inherited a Y chromosome from the father will develop into

1. A boy
2. A girl
3. Anyone of the above
4. None of the above

Q.

How many pairs of autosomes are present in human?

Q. Write the type of sex determination mechanism for the following. Give an example of each type.

Q. The figure shows sex determination in humans.
Who is responsible for the sex of offspring-male or female? Why ?

Q. Human offspring would be a normal female, if the 23${}^{rd}$ pair of chromosome in zygote is

1. YY
2. XY
3. XX
4. XYY

Q. What is the technique for in vitro sex determination?

Q. If the egg fuses with a Y chromosome-bearing sperm, the child produced is a female.

1. False
2. True

Q. There are ........... pairs of chromosomes in human being.

Q. In humans, the composition of a zygote that will develop into a female is

1. $44A+XX$
2. $22+X$
3. $44A+XY$
4. $23A$

Q. This section contains 1 Assertion-Reason type question, which has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
इस खण्ड में 1 कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (a), (b), (c) तथा (d) दिये गये हैं, जिनमें से केवल एक सही है।

A : Different species use very different strategies for sex determination.
A : अलग-अलग स्पीशीज लिंग निर्धारण के लिए अलग-अलग युक्ति अपनाते हैं

R : In humans, the sex of the individual is largely genetically determined.
R : मानव में लिंग निर्धारण आनुवंशिक आधार पर होता है

1. Both (A) and (R) are true and (R) is the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं तथा (R), (A) का सही स्पष्टीकरण है
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं लेकिन (R), (A) का सही स्पष्टीकरण नहीं है
3. (A) is true but (R) is false
   
   (A) सही है लेकिन (R) गलत है
4. (A) is false but (R) is true
   
   (A) गलत है लेकिन (R) सही है

Q. Down syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?

1. $100\%$
2. $75\%$
3. $50\%$
4. $25\%$

Q. Give a brief account on sex determination in human beings.

Q. Pre-natal sex determination has been prohibited by law. State the necessity of inforcement of this law.

Q. If the first seven children born to a particular pair of parents are all males, what is the probability that the eighth child will also be a male?

1. $\frac{1}{2}$
2. $\frac{1}{4}$
3. $\frac{1}{8}$
4. $\frac{1}{16}$