00:02
So, in this question, we are said that the cystic fibrosis, so this is basically a lethal autosomal or recessive disorder in humans and it is said that a woman who is a carrier of cystic fibrosis has the genotype capital c, small c and she has children with a man who is also a carrier and has the genotype capital c and small c and they're asked what are the chances that a particular child will have the cystic fibrosis.
00:36
Now, what are the chances that a particular child will be the carrier? so, firstly, we can use a punnett square and list the possible genotypes of the offsprings.
00:54
So, it would be capital c, small c cross with capital c, small c and we would get the possible genotypes as capital c, capital c and then we'll have capital c, small c and we'll have capital c, small c and this small c, small c.
01:21
So, these are the resulting genotypes.
01:24
Out of these genotypes, the capital c, small c would be the heterozygous type and this would be the recessive and the capital c, capital c would be the dominant type...