EVERYDAY SCIENCE

SCIENCE

GENETIC AND MENDELS LAW OF HEREDITY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A normal couple has five children ,two of whom suffer from a somewhat uncommon genetic disorder that has, however appeared occasionally in this familial line.What kind of gene is involved in this case?
A
Co-dominant
B
Completely dominant
C
Completely recessive
D
Incompletely dominant
Explanation: 

Detailed explanation-1: -In autosomal traits, both males and females are equally likely to be affected (usually in equal proportions).

Detailed explanation-2: -If you are born to parents who both carry the same autosomal recessive gene, you have a 25% (1 in 4) chance of inheriting the abnormal gene from both parents and developing the disease. You have a 50% (1 in 2) chance of inheriting one abnormal gene.

Detailed explanation-3: -If both parents have a heterozygous recessive mutation, their children will have a one-in-four chance of developing the disorder. The risk will be the same for every birth.

Detailed explanation-4: -Autosomal dominant traits pass from one parent onto their child. Autosomal recessive traits pass from both parents onto their child. Autosomal refers to the 22 numbered chromosomes as opposed to the sex chromosomes (X and Y).

There is 1 question to complete.