Answer: crossing over
during the process of fertilization, a sperm and egg join together to create a zygote. since a sperm had half the number of chromosomes and an egg has half the number of chromosomes, when they join together the zygote had a complete diploid set of chromosomes. the assortment of chromosomes and crossing over promotes genetic variation during the process of reproduction
Answer:Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 380 to 740 nanometers. In terms of frequency, this corresponds to a band in the vicinity of 430–770 THz.
Explanation:
It seems that you have missed the necessary options for this question, but anyway here is the answer. Glaucoma has been one of the leading causes of blindness and a common form has been linked to three genes and more that 20 genetic loci. So the statement that best describes glaucoma is that, <span>a polygenic trait that is influenced by the number of alleles present. Hope this answer helps.</span>
Answer:
Lyme disease is characterized by a <u>red rash called erythema migrans</u> at the site of infection.
Explanation:
Lyme disease is caused by the bacterium Borrelia. It is a highly communicable disease, which spreads through the bite of infected tick in humans. At the site of the tick bite, a characteristic red expanding rash can be seen on the skin. This red rash is known as erythema migrans. Other symptoms of this disease include fever, fatigue and headache.
