Ruby's father has curly hair and her mother has straight hair. Ruby, however, has wavy hair. What could be the reason for this?.
. A. Ruby's wavy hair is a blend of curly and straight hair.. . B. The gene for curly hair has multiple alleles, and Ruby has the allele for wavy hair. . . C. Ruby inherited both alleles, which are incompletely dominant.
2 answers:
Answer:
The correct answer would be option C.
Incomplete dominance is a type of allelic interaction in which neither of the alleles is able to complete dominance over the another.
It results in the blending of the two phenotypes.
For example, a cross between red and white flower plants results in the production of pink flower plant, that is, blending of red and white phenotype.
Similarly, hair type also shows the same type of inheritance in which the blending of curly and straight hair results in wavy hairs.
The same is explained below the help of Punnett square.
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Answer:
The genotype of the couple of mice is heterozygous.
Explanation:
First, we going to classify each trait as dominant or recessive allele:
Brown fur: It’s a dominant allele because 12 of 16 mice have brown fur, therefore 75% of the litter have this trait.
Black eyes: It’s a dominant allele because 12 of 16 mice have black eyes, therefore 75% of the litter have this attribute.
Grey fur: It’s a recessive allele because only 4 of 16 mice have this trait, so 25% of the litter have grey fur.
Red eyes: It’s a recessive allele because 4 of 16 mice have red eyes, so 25% of the litter show this trait.
Second, we going to name each phenotype with a letter and use a capital letter for dominant allele or a small letter for recessive allele.
For the color of the fur, let’s use letter “F”:
F: Brown fur
f: Grey fur
For the color of the eyes, let’s use letter “E”:
E: Black eyes
e: Red eyes
The genotype of each phenotype is conformed by two letters that indicates, the recessive allele is showed in the phenotype only when both letters in the genotype are small letter.
For example, for fur, there are three combinations:
FF: Brown fur (two dominant alleles)
Ff: Brown fur (A dominant allele and a recessive allele)
ff: Grey fur (Two recessive alleles)
For eyes, there are also three combinations:
EE: Black eyes (two dominant alleles) (
Ee: Black eyes (A dominant allele and a recessive allele)
ee: Red eyes (Two recessive alleles)
When both allele of the genotype are dominant or recessive, it is heterozygous, if there are a dominant allele and a recessive one, it is a homozygous.
Since there are 7 mice that show recessive phenotype, that means the genotype of the couple of mice are heterozygous. Although, both mice show a dominant phenotype, the genotype have a dominant allele and a recessive allele.
The genotype for the couple of mice is:
FfEe x FfEe
So, when we apply the Mendel's third law, we got the results showed in the chart.
