Biology, 09.10.2019 06:00 Hunter1471
Sometimes there can be more than one desirable gene. you are going to give two plants of your favorite tomato variety to a friend, and you want both of them to have the desirable allele at each of two genes. at gene one, you know the parents are both heterozygotes; at gene two, the mother is heterozygous and the father is homozygous for the desirable allele. what is the probability of any given seed being heterozygous for both genes?
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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?
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Sometimes there can be more than one desirable gene. you are going to give two plants of your favori...
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