Answer;
D.60 million years
Explanation;
The two species shared a common ancestor 60 million years ago, if the molecules found in these two species differ by a total of six mutations.
Mutation is a sudden, random spontaneous change that occur in the genetic make up of an organism or a cell.
If one mutation occurred after 10 million years;
Then six mutations will need (6 ×10) 60 million years.
Answer:
The correct answer is D.
Explanation:
The Ras Proto-Oncogene is a gene found in normal cells, which by the single point mutation mentioned in the question, can turn into Oncogene. Because Proto-Oncogene is a gene that controls and regulates the division of the cell, a mutation in this gene leads to uncontrolled cell divisions which then leads to cancer. The correct answer is D since RAF-Activation describes "Rapidly Accelerated Fibrosarcoma, fibrosarcoma being a cancer which affects fibrobalst cells.
I hope this answer helps.
Haploid are happy diploids are disappointed
Answer:
D) males are hemizygous for the X chromosome
Explanation:
Both males and females have two sex chromosomes, but females have two X chromosomes and males have one X chromosome and one Y chromosome. When only one copy of a gene is present in the cell of a diploid individual, that gene is in hemizygous condition.
- A female can be heterozygous for a sex-linked trait, one X chromosome carrying a dominant allele and the other X chromosome carrying the recessive allele. In that case, the expression of recessive allele will be masked by the expression of the dominant allele.
- Males, however, only have one X chromosome, so any allele it carries will be expressed, regardless of its dominance. For that reason, the frequency of appearance of sex-linked traits will be higher in males than in females.