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In genes what does BB Bb and bb mean?
In genetics, BB represents a homozygous dominant genotype, where both alleles are dominant. Bb represents a heterozygous genotype, where one allele is dominant and one is recessive. bb represents a homozygous recessive genotype, where both alleles are recessive.
What are dominant and recessive alleles with examples?
dominant alleles will always overrule recessive alleles. So if you have any dominant allele in the phnotype or geneotype, the dominant trait will be expressed. For example, since black fur is dominant to brown fur on mice, if two black mice mate, at least part of their offspring will have black fur. If they are heterozygous for black, though, that's when a brown mouse offspring may be possible, but there would always be more black offspring than brown offspring. parents offspring (4) Bb x Bb --> BB, Bb, Bb, bb BB x Bb --> BB, BB, Bb, Bb BB x BB --> BB, BB, BB, BB BB x bb --> Bb, Bb, Bb, Bb Bb x bb --> Bb, Bb, bb, bb anything with a capital B would be black while "bb" is the only brown.
What stands for dominant allele?
Normally a dominant allele is represented by a capital letter. It can be any letter used. Example; Brown hair is dominant and blond is recessive. B represents the dominant allele (brown) and b represents the recessive (blond) in Bb. You can have any combination of two alleles; BB, Bb, or bb. BB would have brown hair, Bb would have brown hair or a mix, and bb would have blond hair. Instead of B we could have used T or any other letter.
A genetic trait which is present but unseen in an individual is called a trait?
Recessive For example, brown eyes (B) are dominant, blue eyes (b) are recessive. BB = brown Bb = brown bb = blue In the Bb genotype, the blue eyed gene is present, but the brown eyed gene is dominant, and show as the phenotype
How do genes offspring the recessive?
The expression of a recessive trait occurs when two recessive alleles recombine. I'm going to use an example for this. Let's say that blue hair is recessive, and black hair is dominant. B = Black hair b = Blue hair If you have the parents: Parent 1: Bb (Has black hair; it dominates blue hair... but is a carrier of the blue hair gene.) Parent 2: bb (Has blue hair; only recessive genes are present) If you use a punnet square, They have four possible combinations of kids: Kid 1: Bb (Black haired; is a carrier of blue hair) Kid 2: Bb (Black haired; is a carrier) Kid 3: Bb (Black haired; is a carrier) Kid 4: bb (Blue haired) These "carriers" are able to have a chance of producing a child with the same recessive gene, whether it be displayed or just carried. It's very confusing, but simple once you get the hang of it. :3
What genotypic condition must be present for a recessive trait to be visible?
if the ratio had more recessive traits, like if you made a punnit square and you saw that there were more of the recessive traits (BB bb bb bb) then you know that the most common trait is the recessive one "bb" (considered as homozygous recessive ( i think))
Is it possible for 2 homozygous recessive individuals to have a homozygous dominant child?
No, homozygous recessive indivuals MUST have two of the reccessive gene (bb), the possible combinations are bb,bb,bb,bb thus only a recessive trait is possible
What are the differrent forms of a gene?
The 3 forms of a gene (called alleles) are:Dominant-dominant Ex.(BB)Dominant-recessive Ex.(Bb)Recessive-recessive Ex.(bb)
In genes what does BB Bb and bb mean?
In genetics, BB represents a homozygous dominant genotype, where both alleles are dominant. Bb represents a heterozygous genotype, where one allele is dominant and one is recessive. bb represents a homozygous recessive genotype, where both alleles are recessive.
Which allele is recessive and which is dominant in the abbreviation Bb?
In the abbreviation Bb, the "B" allele is dominant and the "b" allele is recessive. Therefore, an individual with the genotype Bb would express the dominant "B" allele.
Can two blue eyed parent have one hundred percent blue eyed children?
Yes .. Blue eye color is a recessive allele. So hence when two homozygous recesive alleles are paired, then the succesive generation will also have homozygous recessive alleles.. Like in this case : Father - bb Mother - bb Children - bb,bb,bb,bb So its 100% homozygous recessive.. :)
What does a punett square show?
The chance of a particular trait being inherited. For each trait there are several alleles, some are dominant and others recessive, for example brown eyes are dominant over blue. The recessive phenotype can only have a genotype with both recessive alleles eg. bb The dominant phenotype can have a genotype with both dominant alleles eg. BB or one of each eg. Bb A punnet square shows the likelihood of a phenotype being inherited from given genotypes, alleles etc... BB and Bb makes BB BB Bb Bb All offspring will have the dominant phenotype (BB or Bb) eg. brown eyes Bb and Bb makes BB Bb Bb bb One in four of the offspring will have the recessive phenotype (bb) eg. blue eyes
What word describes the genotype bb?
Homozygous recessive.
What does the notation bb mean to geneticists?
In genetics, the notation "bb" typically refers to a homozygous recessive genotype for a particular gene, where both alleles are the same and recessive. This indicates that an organism carries two copies of a recessive allele, which may result in the expression of a specific trait associated with that allele. For example, if "b" represents a gene for a specific trait, then "bb" would signify that the organism exhibits that recessive trait.
What percent of the offspring of brown haired parents who carry a recessive gene of blonde hair will have blonde hair?
If both brown-haired parents carry a recessive gene for blonde hair (genotype Bb), they can produce offspring with the following combinations: BB, Bb, Bb, and bb. The only combination that results in blonde hair is bb. Therefore, 25% of the offspring will have blonde hair.
A blue peacock bird has the color blue feathers and is heterozygous (Bb), but the flamingo have pink colored feathers but she is homozygous recessive (bb).They are giving birth to a baby bird. How likely is it that the baby bird gets pink feathers?
To express the recessive gene, the baby bird must have bb. Since the one parent is bb, they will always pass the recessive b. The other parent is Bb, so they have a 50% chance of each. Therefore the child has a 50% chance of Bb and a 50% chance of bb. BB is impossible. Therefore the baby bird has a 50% chance of having pink feathers.
Can a man who has brown eyes and whose both parents have brown eyes produce a blue eyed child if his wife has blue eyes?
yes, if the man with brown eyes had a recessive blue trait. his parents would have to both have the recessive trait as well. the parents with dominate brown (B) with recessive blue (b) eye color traits would create a chart of possible outcomes for their child: B b B bb Bb b Bb bb if the man came out Bb (dominate brown with recessive blue) and had a wife with bb (the only way to have blue eyes is to have two recessive blue traits because if a pair of traits has a Brown then the brwn color will automatically dominate over the blue) the man and the wife will make an eye color chart like this: B b b Bb bb b Bb bb there is a 50/50 chance the child will have blue eyes. if the child has the bb trait then it will have blue eyes.
