The spores produce two types of gametophytes: each microspore develops into a microgametophyte (male gametophyte), which ultimately produces male gametes (sperm), and each megaspore produces a megagametophyte (female gametophyte), which ultimately produces female gametes (eggs).
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:
RrYy (F1 generation)
Explanation:
This is a typical dihybrid cross involving two genes in the pea plant; one coding for seed colour and the other for seed shape.
According to Mendel's law of dominance, an allele is capable of masking another allele in a gene, the allele that masks or is expressed is called the DOMINANT allele while the allele being masked is called RECESSIVE allele.
Homozygosity of a gene refers to it having the same type of alleles while heterozygosity refers to having different alleles.
In this example, allele for Round (R) and Yellow (Y) pea is dominant over the allele for Wrinkled (r) and green pea respectively.
Homozygous round green pea (RRyy) crossed with Homozygous wrinkled yellow (rrYY) will give rise to a heterozygous round yellow (RrYy) F1 offsprings.
Answer:
8.327906
Explanation:
1 gallon [US, liquid] to litres = 3.78541 litres
5 gallon [US, liquid] to litres = 18.92706 litres
10 gallon [US, liquid] to litres = 37.85412 litres
15 gallon [US, liquid] to litres = 56.78118 litres
20 gallon [US, liquid] to litres = 75.70824 litres
25 gallon [US, liquid] to litres = 94.6353 litres
30 gallon [US, liquid] to litres = 113.56235 litres
40 gallon [US, liquid] to litres = 151.41647 litres
50 gallon [US, liquid] to litres = 189.27059 litres
we could tell that 2.2 gallons are in between 8.327906 litres
Answer:
B. False
Explanation:
Prior to the replication of a DNA strand or molecule, the double stranded DNA molecule needs to be unwound i.e. separated into two single strands. One strand called the LEADING STRAND that runs from the 3' - 5' direction while the other strand called the LAGGING STRAND runs from the 5' - 3' direction.
The unwinding of the DNA template is carried out by an enzyme called DNA HELICASE, which binds to the DNA molecule and unwinds the double strands into two strands at the same time. This means that the unwinding into leading or lagging strand is not easier than the other since it occurs simultaneously, hence, this question is FALSE.
