Answer:
B) Digestion is the process of breaking down food into smaller molecules.
Explanation:
Answer:
OS, Os, oS, os
Explanation:
To do this, first we need to determine what the genotype of the Plant C offspring is. Since the parents are both true bred, this means that their offspring will get one allele of each parent, of each trait.
Here's a Punnett to help you there
OOSS x ooss
os os os os
OS OoSs OoSs OoSs OoSs
OS OoSs OoSs OoSs OoSs
OS OoSs OoSs OoSs OoSs
OS OoSs OoSs OoSs OoSs
So Plant C would have a genotype of OoSs.
A good trick to determining the gametes of a dihybrid, is the FOIL method. Just like in math, F- first, O-outside, I- inside, and L-Last
Look at the attachment to see the FOIL method:
Missing options:
A) Nerodia spedon and Nerodia fasciata
B) Eudocimus albus and Ardea albus
C) Egretta thula and Platalea ajaja
D) Pituphis melanoleucus and Thamnophis proximus
Answer:
A) Nerodia spedon and Nerodia fasciata
Explanation:
Phylogenetically, the closer relatives share same ancestor and therefore same clad in phylogenetic tree. In the given options, Nerodia spedon and Nerodia fasciata share same genus name so they are closer relatives. If we go further about their characteristics, they are two types of water snakes that are found in north and south America. They both are also non-venomous.
On the other hand, remaining options are not correct because none of the mentioned organisms share same genus name and belong to different positions in the phylogenetic tree.
Question:
Chromosomes are distributed randomly during anaphase I. What are the possible chromosome combinations in the two daughter cells? (Use the following abbreviations for the chromosomes. Dark green -> DG; Light green -> LG; Dark purple-> DP, Light purple -> LP)
How does the random lining up of the homologous chromosome in Metaphase 1 contribute to Genetic Variation?
Answer:
Possible chromosome combinations:
- LG,LP + DG,DP
- LG,DP + DG,LP
The random arrangement of tetrads is different in every cell going through the meiosis process. Any chromosome of the homologous pair might face any of the poles and then migrate to it. Each of the chromosomes has two possibilities for orientation at the plane. When the new haploid cells are formed, the number of variations in each cell is different and depends on the chromosomes that form that cell.
Explanation:
1) During meiosis, organisms can produce at least four different gametes. Anaphase occurs after the prophase where crossing-over has occurred. During anaphase 1, the homologous chromosomes separate, migrating to different poles.
The possible chromosome combinations in the two daughter cells of the exposed example are
- LG,LP + DG,DP
- LG,DP + DG,LP
2) Crossing-over between homologous chromosomes (prophase 1), the random lining of homologous chromosomes (metaphase 1), and random fertilization are the mechanisms involved in genetic variation.
During metaphase I, homologous pairs together migrate to the equatorial plane, where they randomly aline with their kinetochores facing opposite poles. The random arrangement of tetrads is different in every cell going through the meiosis process. There is no equal alinement between two cells. When tetrads aline in the equatorial plane, there is no predetermined order for each of the homologous chromosomes of each tetrad to face one of the poles and then migrate to it while separating. Any chromosome of the homologous pair might face any of the poles and then migrate to it. Each of the chromosomes has two possibilities for orientation at the plane. When the new haploid cells are formed, the number of variations in each cell is also different and depends on the chromosomes that form that cell. This random order in the equatorial plane is what introduces variation into the gametes. It is almost impossible that two gametes resulting from meiosis will get the same genetic charge.
