5. In humans (Homo sapiens), the presence of a widow's peak (B) is dominant to a continuous hair

5. In humans (Homo sapiens), the presence of a widow's peak...

5. In humans (Homo sapiens), the presence of a widow's peak (B) is dominant to a continuous hairline (b). A man with a widow's peak marries a woman with a continuous hairline and they have 11 children. All the children have a widow's peak. What are the genotypes of the father, mother and all 11 children? 6. Jim has a continuous hairline and both of his parents have a widow's peak. Michelle has a widow's peak. Her mother has a continuous hairline, but her father has a widow's peak. Jim and Michelle have one child that has a continuous hairline. What are the genotypes of Jim, Michelle, all of their parents, and their child?

Transcript

00:01 So here we are provided with two questions which are related to the monohybred cross.

00:11 So the first question is giving us the information that in humans presence of widows peak which is denoted by capital v.

00:26 This is dominant over another character which is told as having continuous hair line and it is denoted by small b.

00:54 Now it is telling us that a man with widowspeak marries a woman with continuous hairline and they have 11 children.

01:05 Now all those 11 children have widows peak and so we have been asked to find out the genotype for the father, mother as well as those 11 children.

01:21 So first of all, according to the information, we will write the genotype for man and it was given to us that he was widows peak.

01:33 So here the genotype for man will be capital b.

01:47 And here we have taken the homozygous condition for man as well as for women we will take the homozygous ruminant and homozygous recessive condition because we have been told that their children are also widows speak.

02:03 So if we take the genotype for parents to be heterogeneous, then there are situations where we will get the recessive condition and since they do not have any recessive condition so we will mark the man's genotype as capital b capital b and if we talk about woman genotype then she will be small b small b as she is having continuous hair line now if we make a cross between man having capital b and woman having small b small b, then the gametes will be capital b and small b which when crossed will give an f1 generation offspring as capital b small b and this capital b small b is a heterozygous condition having widows peak and so we can tell that the genotype for all 11 children will be capital b small b.

03:47 This was our explanation for the first question.

03:50 Now moving on to the second question which is giving us the information that a boy gym has continuous hair line and we will denote him as small b small b and both of his parents have a widows peak.

04:24 Now michelle is another girl who has widows peak but her mother was continuous hair line that is having homozycous recessive condition whereas her father.

04:58 Was having widows peak.

05:06 Now jim and michelle have one child who has the continuous hair line...

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