Question

True or False:

1-The structure that joins together the two sister chromatids after replication of chromosomes is called the telomere

2- The phase of the eukaryotic cell cycle during which growth and increase in cell mass occurs following cell division is called G₂ phase.

3- The most important feature of mitosis is that both the parent and daughter cells are diploid.

4- The characteristic feature of the centrosome is that it is not duplicated during mitosis so that only one of the daughter cells eventually receives it.

5- Meiotic cell division is the process whereby the haploid chromosome number is doubled to the diploid state during gamete formation.

6- One of the most important features of meiotic cell division is that it minimizes genetic variation among sexually reproducing populations.

7- If an organism inherits two alleles of a gene it must be heterozygous for that trait.

8- A true breeding strain of an organism maintains a large amount of genetic variability.

9- Recessive lethal mutations exist in a population for a very long period of time.

10- Codominance occurs when an allele of a heterozygote is partially dominant over another allele.

11- A wild-type allele is an altered form of the most common allele.

12- If a gene is polymorphic then it has many forms.

13- A couple that already has several children with the disorder caused by a single gene has a higher risk of recurrence than a couple that has only one child with the disorder.

Answer 1

1. False

It is called as centromere.

2. True

3. True

4. False

Centrosome is duplicated during mitosis and both the daughter cells receives one centrosome each.

5. False

Diploid parent cell forms haploid daughter cells.

6. False

It maximizes genetic variation by showing independent assortment and crossing over.

7. False

If both the alleles are same then the organism is homozygous and if the alleles are different than it is heterozygous.

8. False

True breeding strain is having less genetic variations as compared to heterozygotes.

9. False

Recessive Lethal alleles get negatively selected and therefore eventually get eliminated from the population.

10. False

Codominance occurs when the two alleles are equally dominant over one another.

11. False

The wild type allele is itself the most common allele.

12. False

If a gene is polymorphic, then the sequence of that gene is a variable. It is different in different organisms.

13. False

Both the couples are at equal risk.

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