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4. When the frequency of recombinant between two genes is between 0 and 1, the relationship of these two genes is incomplete linkage.

提问人：网友luyuxiaoyu 发布时间：2022-01-07

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第4题

3. When heterzygote a++//+bc crosses with homozygote abc//abc. in the offspring, which of the following phentype is the least?

A、ab+ and ++c

B、a++ and +bc

C、abc and +++

D、a+c and +b+

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第5题

2. In tomato, there are three linked genes O P and S on the chromosome 2. When F1 OoPpSs testcross with homozygous plants, the results are: +++ 73， ++s 348， +p+ 2， +ps 96， o++ 110， o+s 2， op+ 306， ops 63. The order of these three genes is

A、OPS

B、OSP

C、POS

D、unknown

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第6题

4. When the coefficient of coincidence is 0.5, the real double crossover value is ( ) the theoritical double crossover value.

A、more than

B、less than

C、equal to

D、not related to

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第7题

5. The known genetic distance between BC is 8cM and the distance of AB is 13cM. If eight double-exchange individuals detected in 1600 individuals, the coefficient of coincidence can be calculated to be

A、0.208％

B、0.48％

C、20.8％

D、48.08％

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第8题

1. In drosophila, After several times of artificial hybridization, the genetic distance between the following genes were obtained: A—B=10cM, A—C=20cM, A—D=25cM, B—C=30cM, B—D=15cM. The order of these genes is

A、CDBA

B、DCBA

C、CADB

D、ACDB

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第9题

3. It is known that genes D, E and F are located on a same chromosome orderly. The gentic distance of D—E and E—F are 20cM and 20cM, respectively. When doing the testcross of the progeny of cross DDEEFF × ddeeff, in the offspring, we found that there wer 2% DdeeFf and 2% ddEeff. Can you determine what the coefficient of coincidence is?

A、1

B、0.5

C、0

D、can not determine

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第10题

2. In the cross aaBB×AAbb, which of following statement is right?

A、If A and B are not linked, F1 cannot produce Ab and AB gametes.

B、Comparing A and B linked and not linked, the phenotype and proportion of F1 are not same.

C、Comparing A and B linked and not linked, the phenotype and proportion of F2 are not same.

D、All above not correct.

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