Andalusian fowls have two pure forms — black and white. If black forms (BB) and white forms (WW) are crossed, F1 individuals appear blue coloured (BW), due to incomplete dominance. Which of the following would be an outcome of a cross between black form and blue form ?

Question

Andalusian fowls have two pure forms — black and white. If black forms (BB) and white forms (WW) are crossed, F1 individuals appear blue coloured (BW), due to incomplete dominance. Which of the following would be an outcome of a cross between black form and blue form ? (A) 1 Black: 2 Blue: 1 White (B) 2 Black: 1 Blue (C) 1 Black: 2 Blue (D) 1 Black: 1 Blue

Tardigrade Admin · Accepted Answer

The cross between blue (BW) and black (BB) forms can be shown as: <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/biology/a966cbb6efdb670e75ea4261c7113ae9-.jpeg" /> Thus, black and blue individuals are produced in the ratio of 1:1.

Q. Andalusian fowls have two pure forms — black and white. If black forms $(BB)$ and white forms $(WW)$ are crossed, $F_{1}$ individuals appear blue coloured $(B W)$ , due to incomplete dominance. Which of the following would be an outcome of a cross between black form and blue form ?

$1$ Black : $2$ Blue : $1$ White

$2$ Black : $1$ Blue

$1$ Black : $2$ Blue

$1$ Black : $1$ Blue

The cross between blue $(B W)$ and black $(BB)$ forms can be shown as :

Thus, black and blue individuals are produced in the ratio of $1 : 1$ .

Q. Andalusian fowls have two pure forms — black and white. If black forms (BB) and white forms (WW) are crossed, F1​ individuals appear blue coloured (BW), due to incomplete dominance. Which of the following would be an outcome of a cross between black form and blue form ?

1 Black : 2 Blue : 1 White

2 Black : 1 Blue

1 Black : 2 Blue

1 Black : 1 Blue