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更多“Consider genes P, R and A are inherited independently and dominance is complete. In the po”相关的问题
A、management
B、B. investment
C、C. art
D、D. language
The structure shown is a _____.
A、truss
B、rigid frame
C、beam
D、composite structure
In tomato, there are two pairs of genes, A(purple leave)/a(green leave) and B(red fruit) /b (yellow fruit). When the homozygous plant with purple leave and yellow fruit corss with a homozygous plant with green leave and red fruit, in the F2 population, we found the segreation ratio was 9:3:3:1. If the F1 heterzyous plant (1) back cross with the purple leave and yellow fruit parent; (2) back cross with the green leave and red fruit parent; (3) test cross with the double recessive homozygous plants. Question: What are the phenotype and their proportion of the progeny of the above cross? Please write the genotype of the cross.
In the following family, there is a disease controlled by a recessive gene A on autosome. Please answer the following questions: (1) Write the genotype of individual I-1, I-2, II-4, III-2, III-5, IV-1 and V-1. (2) What is the probability that the brother of V-1 is heterozygote? (3) What is the probability that the two sisters of V-1 are both heterozygote? (4) If V-1 married V-5, what is the probability that their first child is suffered by disease? If we know that the first child is affected（患病）, what is the probability that their second child is also affected?
In barley, husk grain (带壳，N）is dominant to naked grain(裸粒，n) and loose spike (散穗,L) is dominant to dense spike(密穗,l). When a husk grain and loose spike homozygous plant cross with a naked grain and dense spike homozygous plant, in F2 population, there are 265 plants with husk grain and loose spike, 90 plants with husk grian dense spike, 86 plants with naked grain and loose spike, 59 plants with naked grian and dense spike. Question: Are these two triats in accordance with 9:3:3:1 ratio? Please check it in chi-square test.
A、5
B、10
C、20
D、30
A、AABB
B、AaBB
C、AaBb
D、AABb
A、5
B、10
C、20
D、40
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