<h3><u>Answer;</u></h3>
C.) The number of differences in a specific DNA sequence of two species is multiplied by a known mutation rate to determine the number of years of evolution that separate the two species.
<h3><u>Explanation</u>;</h3>
- Molecular clocks are used to date origin of species. They are based on the observation that random mutations accumulate in genes at a fairly constant rate
.
- Once a mutation rate is determined it can be used to establish dates of divergence of species.
- Molecular clocks can be used in putting a series of evolutionary events into chronological order, by comparing sequences from different species to determine when they last shared a common ancestor, in effect drawing the family tree.
Answer: For three traits inherited in a dominant/recessive pattern, the probability of an offspring in a trihybrid cross between parents heterozygous for all three traits to be recessive at exactly two of the three loci is 23/64.
Explanation: Let A, B and C represent the dominant alleles and a, b and c represent the recessive alleles. The genotype of each of the parent will be AaBbCc since it has been said to be heterozygous for all the three traits. There are eight (8) possible different types of gametes from each of the genotype. This can be calculated using 2^n where n is the number of heterozygous loci.
The number of heterozygous loci in the genotype AaBbCc is three (3). 2^3 = 8. The gametes are;
ABC
ABc
AbC
Abc
aBC
aBc
abC and
abc.
Therefore, sixty-four possible offsprings are expected from the cross AaBbCc x AaBbCc.
Out of these offsprings, twenty-three (23) are expected to be heterozygous at two loci as boldly shown in the attached image.
<span>The correct answer is that cholesterol is
steroidal alcohol.</span>
Cholesterol is an important organic molecule biosynthesized by all animal cells because it is an essential structural component of cell membranes. Its function in the membrane is to maintain membrane structural integrity and fluidity and to change cell’s shape rapidly. Cholesterol is a precursor for the biosynthesis of steroid hormones and vitamin D and bile acid.
i think its sedimentary rock
hoped this helped
Answer:
Hawai'i Volcanoes National Park protects some of the most unique geological, biological, and cultural landscapes in the world. Extending from sea level to 13,677 feet, the park encompasses the summits of two of the world's most active volcanoes - Kīlauea and Mauna Loa.
Explanation: