When an animal has both the characters of male and female, it is called

Question

When an animal has both the characters of male and female, it is called (A) intersex (B) super female (C) super male (D) gynandromorphy

Tardigrade Admin · Accepted Answer

Genic balance theory of sex determination was devised to explain the mechanics of sex determination in male Drosophila melanogaster.

XO

or

X Y

chromosome segregation was interpreted as a means of tipping the balance between maleness and femaleness, whereas more deep-seated processes were involved in the actual process of sex determination. Bridges experimentally produced various combinations of X-chromosomes and autosomes in Drosophila and deduced from comparisons that one

X

chromosome

(X)

and two sets of autosomes (A) produced a normal male. Normal males had a ratio of

\underline{X}

chromosome to sets of autosomes of

0.5

, note that one set of autorsomes consists of three chromosomes, one each of chromosomes II, III and IV. (The X chromosome of Drosophila is chromosome-I). This combination of one

X

and two A's resulted in a normal, diploid male; the combination of two

X

chromosomes and two sets of autosomes

(2 X + 2 A

, ratio of

2 : 2 = 1)

produced a normal diploid female (Table ).
Flies produced experimentally with

4 X /3 A

were also metafemales.
Those with

4 X /4 A

and also those with

3 X /3 A

, both with an

X / A

ratio

= 1

, were females.
The combinations

3 X /4 A = 0.75

and

2 X /3 A = 0.67

were intermediate in
characteristics between males and females and were called 'intersexes'. Combinations of

2 X /4 A = 0.5

were males and those of

1 X /3 A = 0.33

were metamales.
Table : Ratio of

X

-chromosomes to autosomes and corresponding sex type in Drosophila melanogaster

$X$ -Chromosomes $(X)$ and sets of Autosomes $(A)$	Ratio $X / A$	Sex
$1 X 2 A$	0.5	Male
$2 X 2 A$	1.0	Female
$3 X 2 A$	1.5	Meta female
$4 X 3 A$	1.33	Meta female
$4 X 4 A$	1.0	Tetraploid female
$3 X 3 A$	1.0	Tetraploid female
$3 X 4 A$	0.75	Intersex
$2 X 3 A$	0.67	Intersex
$2 X 4 A$	0.5	Tetraploid male
$1 X 3 A$	0.33	Metamale

Q. When an animal has both the characters of male and female, it is called

intersex

super female

super male

gynandromorphy