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Shortening of ______________ is inversely associated with aging. Human blood types are an example of ___________...

Shortening of ______________ is inversely associated with aging.

Human blood types are an example of ___________ because the A and B alleles are expressed at the same time, if a person has one of each allele.

The proportion of shared genes between a grandparent and grandchild is _____ percent.

The proportion of shared genes between siblings is _____ percent.


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Answer #1

1. Telomeres

Aging and telomeres have an inverse relationship. Telomeres are the repetitive sequences which are present at the tips of chromosomes. They are added after DNA replication is completed to solve end replication problem in eukaryotes.

The length of telomeres in chromosome decreases the process of ageing gets accelerated.

2. Codominance

Codominance is the type of inheritance in which there are two dominant alleles and both of them are equally dominant to one another. In case of blood group in human beings, all the alleles are equally dominant to one another and therefore we see antigens of both A and B on the surface of RBC of individuals having AB blood group.

3. 1/4

4. 1/2

For 3 and 4, see below -

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