When the effects of genes add up to make the phenotype, they are called additive genes.
Answer:
A parasites is known to cause malformations, but only when it attacks tadpoles at a certain point in their development. Predators can cause missing or shortened limbs, as a partially eaten tadpoles regenerate lost tissues.
C but it's still not exactly correct, they would just be definite carriers of the colour blind trait but only the girls are able to obtain the gene
Answer: C. Linear chromosomes lacking introns
Explanation: Eukaryotes have linear chromosomes. After cellular replication, introns are spliced in eukaryotes and only keep the exons. This process also includes a 5’ cap and a poly-A tail.
Answer:
The correct answer is b. must be present in a population before natural selection can act upon the population
Explanation:
Genetic variation can be caused by mutation, recombination between chromosomes during meiosis and by fusion of two genetically different gametes during sexual reproduction.
This genetic variation is necessary for the evolution of any population. Natural selection acts on every individual and it decreases the frequency of those alleles that are not suited for the environment and increase the frequency of those alleles which helps the individual to survive in the changing environment.
Therefore genetic variation must be present in the population before natural selection act on the.
