题目内容
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3. In a zygote, there are two pair of genes（A and a, B and b) on one pair of homologous chromosome. The chromosome of the somatic cell is
A.AABB
B.AaBB
C.AaBb
D.AABb
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发布时间：2022-01-07
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更多“3. In a zygote, there are two …”相关的问题
第2题
Female mammals that are heterozygous for an X-linked gene have patches of cells that express one allele and patches of cells that express the other.
第3题
Do you know what lungs (肺) are like？ (11) are in the upper part of our bodies. We have two of them. There are thousands of little pipes (管子) going through them. The (12) are like the branches of a tree and they go through every part of each lung. When we breathe in, air goes through the nose and mouth and travels down a large pipe. The other end of this pipe becomes two smaller pipes and each goes into one lung. (13) passes through those pipes and is carried around the body.
When you (14) , your upper body moves in and out. To breathe in, air rushes into your lungs. To breathe out, air is forced out of your lungs. The air we breathe goes into every part of the lungs through the branching pipes. They take it to the (15) which is moving all the time through the lungs and round to every part of our bodies. The blood goes around our body and back to the lungs in a very short time.
第4题
2. The number of chromosomes in somatic cells（体细胞） is 20. After meiosis, the number of chromosomes in the daughter cells is
A、5
B、10
C、20
D、40
第5题
6. In somatic cell, genes on different loci in a pair of homologous chromosomes are allelic genes，and genes in non-homologous chromosomes are non-allelic genes.
第6题
4. If 100 primary oocytes（初级卵母细胞） and 500 primary sperm cells （初级精母细胞）are all mature, how many zygote (合子） will form after fertilization?
A、100
B、400
C、500
D、2000
第7题
1. In corn: (1) how many gametes will be generated from 5 microsporocyte? (2) how many gametes will be generated from 5 megasporocyte? (3) how many gametes will be generated from 5 pollen cell? (4) how many gametes will be generated from 5 embryo sac?
