If X Chromosome is Inherited from Mother and Y from Father, the Offspring Will Be Male. - Science and Technology 2


If X chromosome is inherited from mother and Y from father, the offspring will be male.




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2012-2013 (March)



Explain sex determination in human beings.

Answer the following questions related to sex determination in human beings:
i. What is sex chromosome?
ii. How many pairs of chromosomes are present in human beings?
iii. How is the sex of the human offspring determined?
iv. Draw a diagram depicting sex determination in man.

Differentiate between male and female heterogamety

Name the species used in sericulture. Name the stages in the life cycle of a silk moth in cyclic form. 

Write notes on Sex determination in the unborn baby.

Which of the following is an example of ZW – ZZ type of mechanism of sex determination?

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

There are two sets of chromosomes in the zygote.

Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?

The human animal which has an XY pair of chromosomes is called :
(a) male
(b) hybrid
(c) female
(d) doomed

A normal cell of human body contains 23 pairs of chromosomes. The number of chromosomes  in a sex cell (sperm or ovum) of a human being is most likely to be :
(a) 46
(b) 23
(c) 21
(d) 42


Name two animals which have nineteen pairs of chromosomes. 

A family consists of two parents and their five children and the pedigree chart below shows the inheritance of the trait colour blindness in them.  

Who is colour blind in the parents – the Father or the Mother?  

Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?

________ shows haplo-diploid type of sex-determination.

Choose the correct answer from the four options given below : 
In a human male, a sperm will contain : 

Define the following:
Sex chromosomes

Define the following:
Sex-linked characters

How is sex of zygote determined in humans?

What do you understand by sex-linked inheritance?

Choose the correct answer:

Males have more chances of suffering from sex-linked disease because of ___________

With the help of a chart, explain the method of sex determination in honeybees.

Drone of the honeybees shows haploid number of chromosomes. Illustrate. 

In which livings, female decides the sex? Give two examples.

(a) How many pairs of autosomes and Paris of sex chromosomes are present in a human being?  
(b) Which chromosomes are present in Females? 
(c) Which chromosomes are present in Male? 
(d) How does sex determination take place in human beings? 

Answer the following question:
How is sex determined in human beings? Explain with the help of a diagram. 

Give Reason:

Why X-linked recessive diseases are more common among males than females.

Write a short note on sex determination in man.

Give Technical Term:

The cell which determines the sex of a baby.

How drones are produced in honey bees?

Kavitha gave birth to a female baby. Her family members say that she can give birth to only female babies because of her family history. Is the statement given by her family members true? Justify your answer.

XO type of sex determination and XY type of sex determination are examples of ____________.

ZW-ZZ system of sex determination occurs in

Which of the following is incorrect regarding ZW-ZZ type of sex determination?

What is haplodiploidy?

Distinguish between heterogametic and homogametic sex determination systems.

What is Lyonisation?

Differentiate Intersexes from Supersexes.

What is male heterogamety?

Brief about female heterogamety.

Explain the mode of sex determination in honeybees.

How is sex determined in human beings?

Identify the female heterogamety from the chromosomal complements given below.

Read the following statements and select the correct option.

i. If sperm containing Y chromosome fertilizes the ovum, then diploid zygote is formed that grows into a male child.

ii. If sperm containing X chromosome fertilizes ovum, then diploid zygote is formed, that grows into a female child.

From the following which option correctly represents the normal genetic constitution of a ovum?

There are five daughters and no son in a family. It is because

Which type of sex determination is observed in honey bee?

Match the items of Column I with Column II:

  Column I   Column II
i. XX-XO method of Sex Determination a.  Turner  syndrome
ii. XX-XY method of Sex Determination b. Female heterog ametic
iii. karyotype-45 c. Grasshopper
iv. ZW-ZZ method of Sex Determination d. Female homogametic

Diploid larvae which get royal jelly as food develops into ____________ and other develops into workers (sterile females).

Which of the following organisms has haploid number of chromosomes?

Which of the following develops through parthenogene is?

Chromosomal constitution of normal human females can be written as ______.

The ‘X’ body of Henking was observed in ______.

ZZ / ZW type of sex determination is seen in ______.

Number of autosomes present in liver cells of a human female is ______.

In XO type of sex determination ______.

Which of the following combination of chromosome numbers represents the correct sex determination pattern in honey bees?

A zygote which has an X-chromosome inherited from the father will develop into a ______.

Which of the following decides the sex of the child?

If a normal cell of the human body contains 46 pairs of chromosomes then the numbers of chromosomes in a sex cell of a human being is most likely to be ______

The maleness of a child is determined by

Select the statements that describe characteristics of genes

  1. genes are specific sequence of bases in a DNA molecule
  2. a gene does not code for proteins
  3. in individuals of a given species, a specific gene is located on a particular chromosome
  4. each chromosome has only one gene

The number of pair (s) of sex chromosomes in the zygote of humans is

The belief that the mother is completely responsible for the sex of the child is wrong because the child

Structures present in a cell which is responsible for determination of the sex of a baby is

Fill the blank circles in figure and identify the sex of child A and B. 

Sex in honey bee is determined by ______.

The chromosomal constitution of a human female can be written as ______

Female heterogamy is shown by

Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.

What is the probability of a girl or a boy being born into a family? Justify your answer.

What is sex determination? Explain the mechanism of sex determination in the case of birds.


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