Q7 of 40 Page 11

Some people can roll their tongue and this is a genetically controlled auto-somal dominant character. [Roller = RR / Rr and Non-roller = rr]

A child who can roll the tongue has one brother who is a non-roller and two sisters who are rollers. If both the parents are rollers, the genotypes of their parents would be ____.

If the genotype of the parents is Rr x Rr


Then by using the punnet square, we can find the genotype of the children.


By using punnet square we will get RR, Rr, Rr, rr genotype. RR, Rr, and Rr are the genotypes of child and two sisters who can roll their tongues and rr is the genotype of brother who is non-roller.


Genotype of Roller = RR / Rr and


Genotype of Non-roller = rr

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The following are the events in the formation of the first cloned animal – the sheep Dolly.

a) Removal of haploid nucleus from the ovum.


b) Implantation of ovum with diploid nucleus into the surrogate mother.


c) Collection of udder cell from the sheep.


d) Injection of diploid nucleus of udder cell into the enucleated ovum.


e) Development of a young clone.


The correct sequential order of these events is __________ .