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16.10.2019 •
Biology
Agene is composed of two alleles. an allele can be either dominant or recessive. suppose that a husband and wife, who are both carriers of the sickle-cell anemia allele but do not have the disease, decide to have a child. because both parents are carriers of the disease, each has one dominant normal-cell allele (s) and one recessive sickle-cell allele (s). therefore, the genotype of each parent is ss. each parent contributes one allele to his or her offspring with each allele being equally likely. complete parts a) through c) below. a) genes are always written with the dominant gene first. therefore, there are two instances the offspring could have genotype ss (one if the mother contributes the dominant allele and the father contributes the non-dominant allele; and one if the father contributes the dominant allele and the mother contributes the non-dominant allele). list the other two possible genotypes of the offspring. nothing
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Ответ:
Two other possible genotypes are: SS and ss.
Explanation:
MOTHER ALLELES:Ss
FATHER ALLELES: S s
Offspring genotype:
SSSs Ss ss
Then, a quarter of the descendants will be homozygous for the recesive allele (ss) and an other quarter, homozygous for the dominant allele (SS)
Ответ:
Biodiversity loss can have significant direct human health impacts if ecosystem services are no longer adequate to meet social needs.
Explanation:
Indirectly, changes in ecosystem services affect livelihoods, income, local migration and, on occasion, may even cause political conflict.
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