Soil is very important to us. We need it to grow our food. Humans have grown crops in soil for thousands of years.
But in some places, crop growing has increased soil erosion. This is because the soil is less protected from wind and rain. Eroded soil produces fewer crops. it is causing problems for farmers.
genetic disease
infectious disease
food poisoning
Explain how cellular respiration and photosynthesis are related.
Compare and contrast aerobic and anaerobic respiration.
Answer:
Cellular respiration is the oxidation of food substances coupled with the release of energy (ATP). It occurs in the mitochondria of living cells.
b. 38 ATP in animals. In plants 2 ATP.
Anaerobic respiration is one that that takes place in the absence of oxygen while aerobic respiration is one that requires oxygen to take place.
Answer: The statement which summarizes the law of segregation is as follows :
During the process of gamete formation, two different forms of a gene ( also called allele) segregate from one another in a random manner and each gamete thus formed, receives one copy of gene.
This is called the law of segregation. It was proposed by Gregor Mendel.
For example- The gene for plant height in pea exists in two forms which are T ( dominant allele- represents tall height ) and t ( recessive allele- represents dwarf height ). If a plant is heterozygous ( having different alleles Tt), it will give two different gametes ( T and t ) during gametogenesis.
These alleles are segregated in accordance with the law of segregation.
The Law of Segregation states that paired genes separate evenly into gametes during meiosis, giving offspring equal chances of inheriting either gene. This observation, derived from experiments with pea plants, is the basis for predicting offspring traits using a Punnett square. The mechanism enforcing this law is the first division of meiosis, though this was not understood during Mendel's lifetime.
The Law of Segregation, proposed by Gregor Mendel, states that paired genes (unit factors) separate or segregate equally into gametes (eggs or sperm) during meiosis. This means that offspring have equal chances of inheriting either gene from their parents. Observations from experiments with true-breeding pea plants led to this law. For instance, the F1 generation expressed the dominant trait while the F2 generation exhibited both dominant and recessive traits in a 3:1 ratio. This segregation of alleles is what allows for accurate predictions of offspring traits using a Punnett square.
Gametes receive one allele from each parent, resulting in three possible combinations for the F2 generation from a monohybrid cross: homozygous dominant, heterozygous, and homozygous recessive. Heterozygotes can result from two pathways, receiving one dominant and one recessive allele from either parent, which alongside homozygous dominant individuals, are phenotypically identical, hence supporting Mendel's observed 3:1 phenotypic ratio.
The physical basis of the law of segregation is the first division of meiosis where homologous chromosomes bearing different versions of each gene segregate into daughter nuclei. This underlining mechanism, however, was not understood by the scientific community during Mendel's lifetime.
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a. The southern hemisphere receives more energy from the Sun.
b. Temperatures decrease in the northern hemisphere.
c. The northern hemisphere receives more energy from the Sun.
d. Temperatures increase in the southern hemisphere.
The right answer is B
The development towards 1.4 Ga of eukaryotes, aerobic organisms such as unicellular algae, will be decisive for the oxygenation of the Earth's atmosphere.
The first multicellular organism is a red alga dating back to 1200 Ma during the Mesoproterozoic era (part of Precambrians). Various forms of life with soft bodies dated between 600 and 541 Ma constitute what is called the Vendian fauna, that is to say the fauna of the Ediacarien.
The appearance of a great diversity of small shelly fauna from 541 Ma will mark what is called the Cambrian explosion.