Summary. Enzymes are catalysts that, within the mild conditions of temperature, pH, and pressure of the cells, carry out chemical reactions at amazing high rate. They are characterized by a remarkable efficiency and specificity. Substrates are the substances on which enzymes act.
Genetical experiments suggest that traits acquired during a person's lifetime are not inherited as proposed by Lamarck's theory that traits acquired or changed over an individual's lifetime could be passed on to its offspring. Through experiments, scientists through many observations and real examples that changes that often occur in an animal's life are not passed down to it's offspring.
They are less likely to be separated during crossing over.
Answer:
Explanation:
Genetic variation is increased by meiosis
During fertilisation, 1 gamete from each parent combines to form a zygote. Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote.
Answer:
In plants that undergo double fertilization, the structure that forms to nourish the seed is called the <u><em>endosperm</em></u>.
Explanation:
The process of double fertilization can be described as a phenomenon in which one of the sperm cells fertilizes the egg cell whereas another sperm cell joins with the two polar nuclei of the ovule
The sperm cell and the egg cell will unite and form the zygote.
<u><em>On the other hand, the sperm which fuses with the two polar nuclei will form the endosperm.</em></u>
<u><em>The endosperm can be described as a nourishing tissue which provides the embryo with nutrients so that it can develop and mature. </em></u>
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