If a cell did not replicate its DNA (during the S-phase) before beginning mitosis, then the two identical daughter cells would only get one chromosome from each pair. This, instead of the normal (diploid) 2 pairs of each chromosome (2×23=46), would lead to two haploid cells with 23 total chromosomes each. They would be unable to function and sustain life, thus would likely die soon after division.
Answer:
The correct answer is b. bbRR.
Explanation:
- Brown eyes color is dominant over blue eyes color. So, we can assign the letter R to the dominant allele that expresses brown eyes and r to the recessive allele that expresses the blue eyes.
- The phenotype bent little finger is dominant over the phenotype straight little finger. We can assign the letter B to the dominant allele, and b to the recessive allele.
a. bbrr
: This genotype belongs to a person with blue eyes and straight little finger
b. bbRR
: This genotype belongs to a person with brown eyes and straight little finger
c. BbRr
: This genotype belongs to a person with brown eyes and bent little finger
d. bbRr: This genotype belongs to a person with brown eyes and straight little finger.
Answer:
D
Explanation:
The first step in DNA replication is to 'unzip' the double helix structure of the DNA molecule. This is carried out by an enzyme, called helicase which breaks the hydrogen bonds? holding the complementary bases of DNA together
Answer:
B. Crossing over allows the final daughter cells to be genetically different