Answer: Convergent evolution
Explanation:
The convergent evolution is a process by which the unrelated or not closely related organisms independently evolve with same traits as a result of being exposed to the same kind of environment or having the same ecological niches. These organisms are linked due to common ancestry.
The given situation is the example of convergent evolution, this is because of the fact that both species (Cacti and cactus-like euphorbs) are native plants of different countries. These species are not closely related but they are sharing common ancestral characteristic with Christmas poinsettia.
Answer:
2. I got you, fam
Explanation:
Think of it like a addition problem, so you are are adding new letters to each square.
First, look at the letters on the outside of the square. There are two uppercase H's and two lowercase H's. These are the alleles of the guinea pigs.
To do Punnert Squares, you are basically adding each of the letters in the squares.
For example, look at the upper left square. There is an H above it and an H to the left. You are going to "add" these to H's to get HH. (Because an H plus another H equals HH).
Then, look at the upper right square. There is an h above it and an H to the left of it (outside the square). Add these two together and you get Hh.
See? Not so bad!
Continue to do this for the lower left square and you get Hh.
This brings you to the fourth, and final, lower right square. Now, there is a lowercase h above it and a lowercase h to the far left of it. This means that the square is going to be hh.
Make sense? This means that your total Punnett Square will look like this (only including the 4-box square):
HH Hh
Hh hh
The first question asked how many Hh alleles does each guinea pig inherit from the mother? Now, looking back at the completed Punnett Square, you can see that there is: 1 HH, 2 Hh, and 1 hh.
So your answer would be TWO, because there are 2Hh in the Punnett Square.
Answer:
The lids of the Petri dishes were inadvertently left on while being sterilized
Explanation:
- The process of eliminating any microbe from a particular object to achieve a sterile aseptic environment is termed as sterilization.
- Sterilization mainly aims to either remove, kill or make any microbe inactive by using various means such as irradiation, heat, pressure, etc.
- In the given question radiation is used to sterilize the Petri dishes and thus, if sterilization is successful there should not be any contamination.
- However, since there is contamination present amongst the bacterial colonies growing on agar plated in the Petri dishes this shows that the sterilization has not been done successfully and a possible reason for this could be that while sterilizing the<em> lids of the Petri dishes were kept on. </em>
Answer:
D
Explanation:
This involves a dihybrid inheritance I.e. two genes are being passed on. During meiosis, specifically, the Prophase stage, homologous chromosomes (similar but non-identical chromosomes received from each parent) line side by side. According to the question, one chromosome contains A and B alleles and its homologue, received by the other parent carries a and b alleles. This means that the diploid individual has a genotype AaBb for that gene.
According to Mendel's law of independent assortment, the alleles separate independently of one another into gametes. I.e. allele A and a separates into the gametes without affecting alleles B and b of the other gene.
Crossing-over, which is the exchange of chromosomal segment occurs between the two homologues. Hence, the exchange of chromosomal segments containing alleles in the individual will possibly produce four gametes with the genotypes: AB, Ab, aB, ab.
