Question

Human skin colour is controlled by several gene pairs. Let us assume here that there are just three and that for each pair there are two alleles, an incompletely dominant one that codes for melanin decomposition and an incompletely recessive one that codes for no melanin decomposition. If a very dark skinned person marries a very light skinned woman, what will be the chance that their offspring will have very dark skin?
(a) 1/64
(b) 1/4
(c) 5/8
(d) 9/64

Explain your answer. ​

Answer 1

$\underline{\bigstar\:\sf Answer}$

Let A,B,C be dominant traint and a,b,c be recessive trait

✭ Very dark skinned people ➝ AABBCC

✭ Very light skinned people ➝ aabbcc

$\boxed{\begin{array}{ccc} \sf Male \;\;\; \: \: \: \: \: \: \: \: \times & \sf Female\\\\\sf \sf AABBBCC\qquad &\sf aabbcc &\sf Parents\\\sf \downarrow\qquad&\quad\downarrow \: \\\sf ABC\qquad &\sf abc &\sf Gametes\\\\ \qquad \qquad \qquad\sf AaBbCc & \: & \sf F_1 Generation\\\sf \qquad\qquad\quad (Moderately \ Dark)\\\\\sf \qquad\qquad\:AaBbCc \times AaBbCc &\:&\sf Selfing \ of \ F_1 \end{array}}$

Gametes of AaBbCc

1. ABC
2. abc
3. ABc
4. AbC
5. aBC
6. abC
7. aBc
8. Abc

Refer Attachment!!

⪼ $\displaystyle\sf Very \ Dark \ [AABBCC] \ is \ \bold{one}$

⪼ $\displaystyle\sf Total \ F_2 \ off \ spring \ is \ 64$

So then their Ratio will be,

➳ $\displaystyle\sf \pink{\dfrac{1}{64}}$

$\displaystyle\therefore\:\underline{\sf Your \ Answer \ is \ \dfrac{1}{64} [Option \ A]}$

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Answer 2

Answer:

➥Malignant refers to cancer cells that can invade and kill nearby tissue and spread to other parts of your body.

Malignant tumors are cancerous growths. They are often resistant to treatment, may spread to other parts of the body and they sometimes recur after they were removed. A cancer is another word for a malignant tumor (a malignant neoplasm).➥Malignant refers to cancer cells that can invade and kill nearby tissue and spread to other parts of your body.

Malignant tumors are cancerous growths. They are often resistant to treatment, may spread to other parts of the body and they sometimes recur after they were removed. A cancer is another word for a malignant tumor (a malignant neoplasm).➥Malignant refers to cancer cells that can invade and kill nearby tissue and spread to other parts of your body.

Malignant tumors are cancerous growths. They are often resistant to treatment, may spread to other parts of the body and they sometimes recur after they were removed. A cancer is another word for a malignant tumor (a malignant neoplasm).