Answer:
Tongue-rolling is dominant, and both parents were heterozygous
Explanation:
Tongue rolling is a type of variation in human beings. When allelic genes are not identical as in Tt, the condition is referred to as heterozygous. An individual with such a genotypic condition is referred to as a heterozygote.
Both parents had a genotype of Tt and they could roll their tongues because T is dominant over the t gene.
T t
T TT Tt
t Tt tt
TT : Tt : tt
1 : 2 : 1
In a heterozygous parent Tt, the chance of producing T gamete from both parents is each 1/2 each. Similarly the chance of forming t gamete is 1/2. Therefore, the chance of gamete T and t fusing to get genotype Tt is 1/2*1/2=1/4.
The ratios of phenotypes are 3/4 will be able to roll the tongue and 1/4 will not be able to roll the tongue.
The mode of inheritance was monohybrid inheritance since one characteristic like tongue-rolling is controlled by a single pair of hereditary factors contributed by both parents.
Answer:
c. Conservative replication
Explanation:
- In conservative mode of replication, the parent DNA molecule will direct the synthesis of entirely new DNA molecule. Hence, one daughter cell will get the old DNA with both parental strands and the other daughter cell will get the new DNA with both new strands.
- But the widely accepted replication model is semi conservative model. Where both the strands separate and act as template for new strands. Hence, the new DNA molecules will have one parental DNA strand and one new DNA strand.
- According to dispersive replication model, the newly synthesized DNA randomly gets fragments of parental DNA.
Hence, the answer is conservative replication.
Uv light is light that covers the electromagnetic spectrum from infrared to near-ultraviolet, or all wavelengths that are useful to plant or animal life
