Monohybrid cross can be defined as
(1) Cross between plants differing in one chromosome
(2) Cross between plants differing in one character only
(3) Cross between plants differing in two traits
(4) All of the above
Types of gametes produced by a homozygous parent
(1) many
(2) single type
(3) depends upon number of genes
(4) depends upon number of chromosomes
If a man consists of an extra copy of chromosome number 18, then the condition is known as
1. Monosomy
2. Trisomy
3. Nullisomy
4. Polyploidy
Disorder caused by the trisomy of chromosome number 21
(1) Klinefelter’s syndrome
(2) Turner’s syndrome
(3) Down’s syndrome
(4) Phenylketonuria
Down’s syndrome was first described in the year
(1) 1962
(2) 1866
(3) 1856
(4) 1863
Gynaecomastia refers to
1. Masculine development in females
2. Development of breasts in males
3. Development of female characters in male
4. Reduced breasts in the female
In humans karyotype of 47, XXY leads to
(1) Klinefelter’s syndrome
(2) Turner’s syndrome
(3) Down’s syndrome
(4) Edward’s syndrome
Furrowed tongue and partially open mouth are characteristics of
(1) Edward’s syndrome
(2) Turner’s syndrome
(3) Down’s syndrome
(4) Klinefelter’s syndrome.
Column I | Column II |
i. Down’s syndrome | a. Broad palm with characteristic palm crease |
ii. Klinefelter’s syndrome | b. Gynaecomastia |
iii. Turner’s syndrome | c. rudimentary ovaries |
d. XO | |
e. XXY | |
f. physical development is retarded. |
Choose the correct match:
1. i-c,d; ii-b,e,f; iii-a
2. i-e,c; ii-b,f; iii-a,d
3. i-a; ii-b,e,f; iii-c,d
4. i-a,c; ii-d,e; iii-b,d
Turner’s syndrome is caused by
(1) Absence of Y chromosome
(2) Absence of one of the ‘X’ chromosome
(3) Trisomy of chromosome number 21
(4) Additional copy of chromosome ‘X’.