When pollen grains land on the stigma of the correct species, they germinate. A pollen tube grows through the tissues of the flower until it reaches an ovule inside the ovary.
The nucleus of the pollen grain (male gamete) then passes along the pollen tube and joins with the nucleus of the ovule (the female gamete). This process is called fertilization.
After fertilization, the female parts of the flower develop into a fruit. The ovules become seeds and the ovary wall becomes the rest of the fruit.
A- populations change over time in response to changes in the environment
B- that all species are clones
C- populations never change
D- individuals have the same genes
b. a powerful, hooked bill
c. close-set eyes to judge distances
d. short wingspan for maneuverability
Answer:
A: acute sense of smell
Explanation:
just took the test :) edg 2022
When you cross a red snapdragon (RR) and a pink snapdragon (Rr), you will expect 50% of the offspring to have red flowers
In snapdragons, red and white flower color exhibits incomplete dominance, where the red (R) and white (r) alleles neither of them is completely dominant or recessive. This results in the heterozygous condition (Rr) appearing as pink flowers. In this case, the red flowered snapdragon would have a RR genotype, while the pink one would have a Rr genotype.
If you cross the red (RR) and the pink (Rr) snapdragons, the possible genotypes of the offspring would be RR and Rr, corresponding to red and pink flowers. Half of the offspring are expected to be RR (red), and the other half Rr (pink). Therefore, 50% of the offspring are expected to have red flowers.
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beaker filled halfway with water. Describe what will happen next.
Polarity is defined as the separation of electric charge in a molecule or having an electric dipole moment due to the difference between negative and positively charged ends.
In the given experiment when one milliliter of the substance into a beaker is filled halfway with water, the substance will be seen as coagulating or not dissolving in the water.
The non-polar are the compounds or liquids that do not dissolve in the water. The non-polar molecules are the molecules, which are attracted to the alike molecules, rather than the water molecules.
The non-polar compounds have covalent bonds, in which the electrons are shared among the atoms of the compound.
The molecules of these liquids are repelled in the presence of water or are hydrophobic. These liquids do not dissolve in water.
Therefore, the liquid is hydrophobic.
To know more about the polarity, refer to the following link:
Answer:
Explanation:
Non-polar liquids are liquids that have covalent bonds in which the shared electrons are shared equally. The molecules of these liquids are repelled by the molecules of water and hence do not dissolve in water. Thus, non-polar liquid are hydrophobic (water dislike/insoluble in water).
When one milliliter of the substance is placed into a beaker filled halfway with water, the substance will be seen "compact" (not dissolving nor interacting) in the beaker of water.
Answer:
Option). 4-5 days.
Explanation:
Morula is a 4-5 days stage of early embryonic development. It represents a solid ball, having 16 cells, known as blastomeres. In human embryo, differentiation begins with morula stage, along with cleavage to form trophoblast (an outer layers of cell) and inner cell mass.
During development, trophoblast forms embryonic part of placenta and inner cell mass form respective structures of embryo.
Thus, the correct answer is option).4-5 days.
Answer:
Day 4-5
Explanation:
The first cell differentiation occurs when the embryo reaches approximately five days after fertilization, forming the blastocyst.
In this case, the cells on the outside undergo the process of differentiation and become responsible for the formation of embryonic attachments (structures that derive from the embryo's germ leaflets but are not part of the embryo's body, such as the amnion).
In the meantime, those cells that remained inside, also undergoing the process of differentiation, become pluripotent stem cells, which are responsible and capable of forming all tissues.
Previously, when they are still undergoing the process of dividing up to 8 cells, each cell is capable of forming a complete being when inserted into an egg.
By going through the whole process and becoming pluripotent stem cells, they can form all kinds of body tissues, butno longer a complete being.