Biology Formative Assessment - Higher - Selective breeding Q1.
Many different types of animals are produced using selective breeding.
Some cats are selectively bred so that they do not cause allergies in people.
Many people have breathing problems because they are allergic to cats
The allergy is caused by a chemical called Fel D1
Different cats produce different amounts of Fel D1
A cat has been bred so that it does not produce FelD1.
The cat does not cause an allergic reaction.
Explain how the cat has been produced using selective breeding and describe any
disadvantages from selective breeding the cat in this way

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.

explanation:

oak trees? ? what was listed

in addition to spreading humanist ideas, erasmus has contributed to criticism of corruption in the church.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.