填空题在某些遗传病的系谱中，有时由于内外环境改变，致病基因的作用没有表现出来，这种现象称为______。

填空题自交的遗传学效应主要是______和______。

填空题7，染色体是由______在______上绕1.75周组成核小体，再经复杂的螺旋化而形成的。

填空题家鸡羽毛有无条纹是性连锁遗传的，无条纹的是隐性，用无条纹的雄性与条纹雌性杂交，所有雄性后代都是______。

填空题______年，孟德尔遗传学说的再次被发现被定为是遗传学科的诞生时间。

填空题点突变可以发生______突变，缺失突变不可发生______突变。

填空题蜜蜂为染色体组倍性决定性别，雄峰为______体，雌蜂为______体。属于这种性别决定的方式还有：______等。

填空题原核生物的核糖体为______S，其大亚基为______S，小亚基为______S；真核生物的核糖体为______S，其大亚基为______S，小亚基为______S。

填空题具有四对等位基因(AaBbCcDd)的一杂合植株，进行自花授粉后出现aabbccdd后代的频率是______，aabbCcDd和AaBbCcDd的频率分别是______和______。

填空题转座因子的自身序列的两侧各有一个______序列存在，转座完成时，常在原靶点DNA两侧各出现一段______序列。

填空题假如子一代是n对基因的杂合体，那么就产生______种配子，子一代配子的可能组合数为______，它们的比数是______的展开。

填空题通过果蝇和爪蟾的分析发现，卵细胞中rRNA的高速合成是通过______方式进行的，体细胞中rRNA合成速度变化，很可能是通过______方式来调节的。

填空题如果父亲是B型血，母亲是O型血，他们的第一个小孩是O型血；那么他们的第二个小孩是O型血的概率是______；是B型血的概率是______；是A或AB型血的概率是______。

填空题不按标准的孟德尔分离比例出现的情况有______、______、______、______、______。

填空题[A] They lack accurate information and prior experience. [B] They copy the actions of their parents. [C] They want to test whether parents will enforce rules. [D] They are held to expectations that are beyond their developmental levels. [E] They want to assert themselves and their independence. [F] They experience different sets of expectations between school and home. One of the most common expressions parents can be heard saying is, "I don't understand why he's/ she's doing that." There are some very common reasons why children misbehave. It is extremely useful for parents to know these because if they can pinpoint the root cause of the misbehavior, they can be more successful at reducing it. 41. ______ Children's main job is to figure out how their complex world works. In order to master the things they need to at each developmental level they will test their parents. They are literally trying to see where the boundaries are, or, if they exist at all. Although testing is frustrating for parents they should know that it is normal and that this is their chance to really make a difference in their child's life. How? By setting boundaries and limits and consistently following through on them. This way, their children will adopt positive values and gain self-esteem. 42. ______ Consistency is hugely important in making a child feel safe and secure and able to have a comfortable understanding of the world and how it works. If they are receiving mixed messages from home and school they will feel uneasy inside and express this through more testing than normal and will feel an inner sense of stress. The best thing a parent can do is learn a simple method to discipline and then have a conversation with their child's teacher. During this conversation, the parents should explain their method and ask how the teacher handles situations. The goal is to try and use some of the same language at both the school and at home. With a consistent, clear message, children will rise to the expectation and be happier in the process. 43. ______ Children begin to show their desire for more independence at around age two. They start to want control over certain areas of their life so that they can feel capable and independent. It doesn't take long for children to identify the areas they CAN control, much to the chagrin (懊恼) of parents. Situations like eating, sleeping, brushing teeth, and dressing are great examples of times when children recognize their power to get you upset and therefore make them feel in control. What is the solution? Give them loads of choice in their daily life so that they feel in control of their life. As well, it is key to learn a simple, loving method to discipline so that misbehaviors are taken care of easily, without any emotion required. Without emotion, there is no reason for the child to want to rebel in order to gain control. 44. ______ When children do something such as go to cross a road for the first time, they do not know that they are supposed to look both ways, so we all know that we must explain to them to look left and look right, etc. However, the same technique needs to be applied to discipline situations. Children will repeat a behavior over and over until they have accurate information as to what they should be doing instead and prior experience of the consequence if they continue the behavior. Using clear, concise language stating what they "need" to be doing rather than what they "shouldn't" be doing is extremely important. Better to say, "Carry this carefully," rather than, "Don't drop this. " In other words, give them something to use as prior knowledge for next time. 45. ______ The best teacher of how to misbehave or act and speak inappropriately is by watching morn or dad misbehave or act and speak inappropriately. Remember, what children see and experience in the home is what their normal is. So, if they see morn and dad yelling, they will yell. If they get spanked, they will likely use hitting to express their anger or frustration. If they hear, "What?" instead of "Pardon?" that is what they will use. Although not always simple, parents need to look at parenting as a life lesson in personal growth. Children can make open and willing parents into the best human beings in the world because they have the opportunity to practice being their best selves every single day of the year.

填空题有角的公羊与无角的母羊交配，F1代中母羊都无角，公羊都有角，使F1中公羊与母羊交配，得到的F2代中，公羊3/4有角:1/4无角，母羊3/4无角:1/4有角，这一现象属于______遗传。

填空题单倍体雄蜂形成单倍性精子的方式是______。

填空题两株高度都是90cm的某种植物杂交，后代都是90cm高，亲本可能的基因型是______。

填空题金丝雀的黄棕色羽毛由性连锁隐性基因a控制，绿色羽毛由基因A控制。有一组合的后代中，所有的雄雀都是绿毛的，雌雀都是黄棕色的。该组合的亲本基因型为______(父本)和______(母本)。

填空题人的色盲是性连锁隐性基因b引起的，而兰眼是常染色体隐性基因d引起的。两个褐色眼视觉正常的人结婚，生一个蓝眼并色盲的儿子，双亲的基因型是：母亲______，父亲______。