The possible genotypes for someone who can roll their tongue are RR or rr, where the R allele is dominant over the r allele.
<h3>What do you mean by Genotypes?</h3>
Genotypes may be defined as the ultimate combination of alleles of those genes which are selected for a particular study or interest.
If R represents the dominant allele and a person rolls their tongue having this allele, while the r represents the recessive allele and a person can not roll their tongue having this allele. To roll their tongue, a person needs only one dominant allele. Thus the person could have genotypes of RR or Rr.
Therefore, the possible genotypes for someone who can roll their tongue are RR or rr, where the R allele is dominant over the r allele.
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Answer:
The correct answer is - B. Non-disjunction during sperm formation resulted in her receiving no sex chromosome from her father and an X chromosome from her mother; she is XO.
Explanation:
In this case, the mother was a carrier of hemophilia and she transfers that mutant allele to her daughter and as the daughter did not get any sex chromosome from her father.
Therefore, mutant X expresses itself and she is hemophilic.
This X did not express in case, of her mother due to fact that it is a recessive allele and only expresses when both genes is the same state.
It directly relaxes vascular smooth muscle, allowing dilation of peripheral arteries and veins.
According to the rules of human genetics, if Betsy and Rudolph have a calf it will have a black nose.
What are alleles?
- The substance that is stably passed down, unchanged, from parent to offspring through the gametes, over successive generations is called as ‘factors’ now called as genes.
- Genes, therefore, are the units of inheritance. They contain the information that is required to express a particular trait in an organism. Genes which code for a pair of contrasting traits are known as alleles, i.e., they are slightly different forms of the same gene.
- Since Betsy has a dominant trait and doesn't carry any recessive gene and Rudolf has a recessive trait, their phenotypes will be NN and nn respectively.
- Mendel proposed that in a pair of dissimilar factors, one dominates the other and hence is called the dominant factor while the other factor is recessive. In this case N (for black nose) is dominant over n (for red nose), that is recessive.
- From the punnet square it is seen that the all the fertilisations lead to individuals having 'black nose' only and none of them will have 'red nose'.
- Within the genotypic pair Nn only one character N 'black nose' is expressed. Hence the character N or ‘black nose’ is said to dominate over the other allele n or ‘red nose’ character.
- It is thus due to this dominance of one character over the other that all the calf will have 'black nose' with Nn as the genotype.
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Answer:
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Explanation: