Two parents are carriers of a genetic disease. Therefore, ?...

Two parents are carriers of a genetic disease. Therefore, ? each parent will pass a disease allele on to all of their offspring. ? both parents have the disease. ? it's not possible for any of their children to be born with the disease. ? there's a 25% chance that a child of theirs will be born with the disease.

Transcript

00:01 Not to answer this question, let's talk about inheritance.

00:02 It says many serious diseases can be passed from pine to offspring through genes, in which case, given below, is a recessive disease not able to be passed on.

00:13 So remember that the importance of recessive adiles is that they can be transmitted along many generations in one family and without expressing a disease.

00:26 Because remember that if you have a recessively, let's suppose this is the homocygous dominant and the hydrosygos.

00:34 In this case, both are going to be normal people, and the homozygo recessive is for a person with a disease.

00:42 So people with this genotype are rarely going to be made or going to mate with other people because they are very sick, so they may die early or they may be very disabled in order to meet people and to reproduce.

00:56 Okay, so these people usually, die.

00:58 But in this case, for the heterocygous people, then they are going to be normal because they are only carriers for the mutation allele.

01:06 Remember that they want to express the disease that is recessive, you need two excessive leaves.

01:11 So these people here are going to reproduce for many generations producing normal offspring like this or even more heterocygous.

01:18 So the amount of heterocygous people are going to expand.

01:22 So you are not going to maybe rarely like in maybe in one generation, one heterocycles is going to make with another heterocycles, and in that situation, there can be production of an offspring with a disease.

01:36 But in other situations or in general, the number of disease in a family with a recessive disorder are going to be only few cases of people with a disease.

01:47 So this question says, in which case given below is a excessive disease not able to be passed on? it is talking about the excessive failure not to be passed on.

01:55 So option a says, if one parent has...

01:58 One allele or has no alleles for the disease.

02:01 So if the parent has one allele, it means the parent can be like this...

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