Answer:
C. Lizards were the first organisms on Earth to have limbs.
Explanation:
This cladogram illustrates when and in what species novel anatomical traits occurred. All the organisms that follow after a certain point will have this trait present. Thus, earthworms are the first species to evolve segmented bodies which will be present in all the following organisms such as salmons. Here, segmentation is found in the vertebrae of the backbone as well as in the muscles and nerves that spread from the spinal cord, at a finer level.
This cladogram does not illustrate the evolutionary time relationship between different species. Thus, it cannot be inferred that the kangaroos evolved after earthworms.
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The steps in taking a ridge count from a fingerprint are as
follows:
1. Draw an imaginary line from the center of the core to the
edge of the delta
2. Count all the ridges that touch or cross the imaginary
line
3. The core and delta should not be included in the counting
4. Incipient ridges are never to be counted regardless of
where they appear
NUMERICAL VALUE
ASSIGNED TO RIDGES
An island ridge – One count
A short ridge – One count
A long ridge – One count
Abrupt ending ridge – One count
A ridge that bifurcates across the imaginary line – Two counts
A bifurcating ridge whose point of origin is on the line of
count – Two counts
Eyelet ridge – Two counts
Intersection of two enclosures – Two counts
The core is located on ending ridge which touches the inside
of the innermost recurving – Four counts
There are more men then women in the world holding a balance of 102 men to every 100 women. Women lose the ability to have children around the age of 50 or in their 50s while men never lose the ability to reproduce.
Answer:
A. Non-disjunction during Anaphase I of meiosis.
Explanation:
Euploidy is an alteration in the organism´s natural number of chromosomes. Individuals with euploidy express a different number of homologous chromosomes set than the one from the normal number.
<em>The cause of this alteration is that homologous chromosomes do not separate during the anaphase of meiosis 1. </em>
There are two types of euploidy:
- Polyploidy: Increase in the number of chromosomes characteristic of a diploid complement. During anaphase 1, homologous chromosomes do not separate and migrate together to the same pole. One of the resulting gametes ends with the whole chromosomic material, while the other cell ends with non. The first one goes through the second phase of meiosis and forms two diploid gametes.
- Monoploidy: Decrease in the normal number of chromosomes. The individual only gets one set of chromosomes. This is a monoploid organism, n.
