What is the relationship among chromosomes, genes, and dna? a. genes read the dna code found on chromosomes. chromosomes are long tightly wound strands of dna. b. genes are made up of tightly wound strands of dna. chromosomes are made up of one or more genes. c. genes are sections of dna and are found on chromosomes. chromosomes are long, tightly wound strands of dna. d. dna reads the nucleotide sequences found in genes. genes are located on tightly wound structures called chromosomes.

The steps in the formation of extrusive igneous rocks are listed below in an incorrect order: 1. rock melts due to high temperature. 2. rock is buried deep under earth's surface. 3. magma is forced out of earth's surface during volcanic eruption. 4. lava cools and crystallizes to igneous rock. which of these best shows the correct order of steps in the formation of extrusive igneous rocks? 1, 3, 4, 2 2, 1, 3, 4 3, 4, 2, 1 4, 2, 1, 3

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?