He was unable to explain the genetic basis for variation in a population.
Explanation:
Fertilization, pictured in Figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. The egg and sperm each contain one set of chromosomes. To ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. In mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. When a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. In placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in Figure 24.23b. The fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. The nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.
Answer:
The major structural difference between chromatin and chromosomes is that the latter are more organized and condensed.
Explanation:
Chromatin is genetic material packaged into a complex by special proteins (histones). That complex is in the form of uncoiled structures, so chromatin fibers are long and thin. Chromatin structure is permissive to DNA replication, transcription and recombination events.
On the other hand, chromosomes are highly condensed structures of genetic material that are formed just before the cell division.
1. One of the ways that environment can influence population size is by stopping pollution. Pollution is dangerous for species to grow since it brings a lot of disease which is harmful for animals.
2. the abiotic factor that human uses upon insects to establish a limiting capacity is pesticide. And the biotic is by; <span>healthy fertile soil, matching your plants to the soil type, ensuring proper sunlight levels and watering conditions. These tips will help you avoid insects from plantation.
3. As ants work together sports teams do the same. Because they all need each other to make a pattern and have the rules. As an example, We all know that every sports team has a captain that make sure that the team is working and playing in the correct way. Ants as well have a captain but they call her a QUEEN, the queen makes sure that every ants is doing it's work so that they can feed their colony.</span>
The energy of light captured by pigment molecules, called chlorophylls, in chloroplasts is used to generate high-energy electrons with great reducing potential. These electrons are used to produce NADPH as well as ATP in a series of reactions called the light reactions because they require light.
