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4. Albinism, a condition characterized by a partial or total lack of skin pigment, is a recessive human trait. If a phenotypically unaffected couple produced an albino child, what is the probability that their next child will be albino? 5. Huntington disease is a rare dominant trait that causes neurodegeneration later in life. A man in his thirties, who already has three children, discovers that his mother has Huntington disease though his father is unaffected. What are the following probabilities? A. That the main in his thirties will develop Huntington disease? B. That his first child will develop Huntington disease? C. That one out of three of his children will develop Huntington disease? 6. A recessive allele in mice results in an unusually long neck. Sometimes, during early embryonic development, the long neck causes the embryo to die. An experimenter began with a population of true-breeding mice with normal necks and true-breeding mice with long necks. Crosses were made between these two populations to produce an F generation of mice with normal necks. The F mice were then mated to each other to obtain an F generation. For the mice that were born alive, the following data were obtained: 522 mice with normal necks 62 mice with long necks. What percentage of homozygous mice (that would have had long necks if they had survived) died during embryonic development? 

          4.
Albinism, a condition characterized by a partial or total lack of skin pigment, is a recessive human
trait. If a phenotypically unaffected couple produced an albino child, what is the probability that
their next child will be albino?
5.
Huntington disease is a rare dominant trait that causes neurodegeneration later in life. A man in his
thirties, who already has three children, discovers that his mother has Huntington disease though
his father is unaffected. What are the following probabilities?
A. That the main in his thirties will develop Huntington disease?
B. That his first child will develop Huntington disease?
C. That one out of three of his children will develop Huntington disease?
6.
A recessive allele in mice results in an unusually long neck. Sometimes, during early embryonic
development, the long neck causes the embryo to die. An experimenter began with a population of
true-breeding mice with normal necks and true-breeding mice with long necks. Crosses were made
between these two populations to produce an F generation of mice with normal necks. The F
mice were then mated to each other to obtain an F generation. For the mice that were born alive,
the following data were obtained:

522 mice with normal necks
62 mice with long necks.

What percentage of homozygous mice (that would have had long necks if they had survived) died
during embryonic development?
Show more…
4. Albinism, a condition characterized by a partial or total lack of skin pigment, is a recessive human trait. If a phenotypically unaffected couple produced an albino child, what is the probability that their next child will be albino? 5. Huntington disease is a rare dominant trait that causes neurodegeneration later in life. A man in his thirties, who already has three children, discovers that his mother has Huntington disease though his father is unaffected. What are the following probabilities? A. That the main in his thirties will develop Huntington disease? B. That his first child will develop Huntington disease? C. That one out of three of his children will develop Huntington disease? 6. A recessive allele in mice results in an unusually long neck. Sometimes, during early embryonic development, the long neck causes the embryo to die. An experimenter began with a population of true-breeding mice with normal necks and true-breeding mice with long necks. Crosses were made between these two populations to produce an F generation of mice with normal necks. The F mice were then mated to each other to obtain an F generation. For the mice that were born alive, the following data were obtained: 522 mice with normal necks 62 mice with long necks. What percentage of homozygous mice (that would have had long necks if they had survived) died during embryonic development?

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Julianne Zedalis, John Eggebrecht
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Albinism, a condition characterized by a partial or total lack of skin pigment, is a recessive human trait. If a phenotypically unaffected couple produced an albino child, what is the probability that their next child will be albino? Huntington disease is a rare dominant trait that causes neurodegeneration later in life. A man in his thirties, who already has three children, discovers that his mother has Huntington disease though his father is unaffected. What are the following probabilities? A. That the main in his thirties will develop Huntington disease? B. That his first child will develop Huntington disease? C. That one out of three of his children will develop Huntington disease? A recessive allele in mice results in an unusually long neck. Sometimes, during early embryonic development, the long neck causes the embryo to die. An experimenter began with a population of true-breeding mice with normal necks and true-breeding mice with long necks. Crosses were made between these two populations to produce an F_(1) generation of mice with normal necks. The F_(, ) mice were then mated to each other to obtain an F_(2) generation. For the mice that were born alive, the following data were obtained: 522 mice with normal necks 62 mice with long necks. What percentage of homozygous mice (that would have had long necks if they had survived) died during embryonic development? Albinism,a condition characterized by a partial or total lack of skin pigment,is a recessive human trait. If a phenotypically unaffected couple produced an albino child,what is the probability that their next child will be albino? Huntington disease is a rare dominant trait that causes neurodegeneration later in life. A man in his his father is unaffected.What are the following probabilities? A.That the main in his thirties will develop Huntington disease? B. That his first child will develop Huntington disease? C.That one out of three of his children will develop Huntington disease? A recessive allele in mice results in an unusually long neck. Sometimes,during early embryonic development, the long neck causes the embryo to die. An experimenter began with a population of true-breeding mice with normal necks and true-breeding mice with long necks. Crosses were made between these two populations to produce an F, generation of mice with normal necks. The F mice were then mated to each other to obtain an F, generation. For the mice that were born alive, the following data were obtained: 522 mice with normal necks 62mice with long necks What percentage of homozygous mice (that would have had long necks if they had survived) died during embryonic development?
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Transcript

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00:01 We're going to look at a few different examples of patterns of inheritance.
00:04 So we're going to start with just the classic complete dominance and complete recessiveness, which just means that on a certain gene you have a dominant allele and a recessive allele.
00:18 So in this case, let's say, for example, we're looking at flowers, and one parent has blue flowers, the other one has red.
00:28 And say for this example that all of the offspring are blue in color.
00:36 Well, that means that blue is the dominant gene.
00:42 So in this example, we might have, you know, blue parents who, in this case, the blue parent has two dominant genes because blue is the dominant trait.
00:53 And then red, that is the recessive trait, you only get when you have two recessive alleles.
00:58 And so when you cross two parents like this, first parent can only give dominant all the offspring will get a dominant allele from that parent.
01:08 And the second parent can only give recessive.
01:10 And so all the offspring have to get a recessive from that parent.
01:14 So all of our offspring end up being heterozygous, i guess, but they have that one dominant allele, which means they have the dominant trait blue.
01:23 So that's what an example of complete dominance would look like.
01:27 There is another type of dominance called co -dominance.
01:35 And this is where you have two dominant alleles that can't quite seem to overcome each other.
01:47 So instead of having one thing that's dominant, like blue is dominant over red.
01:51 So if there's any blue alleles, you don't see any red.
01:55 In this case, we have two different.
01:59 Traits that are both dominant.
02:01 Let's say flowers can be white or they can be red and both things are dominant.
02:07 So we would give both of them a dominant allele.
02:12 Like this is dominant r's, this is dominant red.
02:15 Dominant w is dominant r's.
02:16 So when we have offspring that will get a w allele from the first parent and a dominant r from the other parent, you end up with a mixture of the two.
02:27 Co -dominance, meaning that they're both trying to be dominant, but end up having to coexist and create something new.
02:36 And so in this case, you would end up with all offspring that are pink, which is the in -between of white and red.
02:45 But we're going to look at one more option that you can get with simple genetics like this, and that is incomplete dominance.
02:58 Incomplete dominance is sort of similar to the co -dominance, except we don't end up with a mixture between two traits.
03:09 So you don't mix white and red to get pink or short and long to get medium.
03:13 So i'll show you a couple of examples.
03:17 Here we can look at the classic example of row and cows, but i also want to show you what it looks like in the beginning...
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