QUESTION IMAGE
Question
when you get confused, look back up here!
- a - uppercase, big = dominant (always expressed) for example, having dimples
- a - lowercase, small = recessive (expressed only when two lowercase are together), for example, no dimples
- aa - two uppercase alleles are homozygous (same) dominant - person has 2 dominant alleles and expresses (shows) the dominant trait - so person would have dimples because it has both dominant alleles
- aa - two lowercase alleles are homozygous (same) recessive - person has 2 recessive alleles and expresses (shows) the recessive trait - so person would have no dimples
- aa - two different size alleles are heterozygous (different) - person has one of each, so the dominant allele is expressed - person would have dimples
section a
identify whether the allele is dominant (uppercase/big letter) (d) or recessive (lowercase/little letter) (r):
section b
identify whether the gene is homozygous (ho) or heterozygous (he):write ho or he after the genotypes.
section c
identify whether the gene is homozygous dominant (hod - two dominants), heterozygous dominant (hed - one dominant, one recessive), or homozygous recessive (hor).
Brief Explanations
- Section A:
- According to the given rules, uppercase letters represent dominant alleles and lowercase letters represent recessive alleles.
- For allele \(X\), since it is uppercase, it is dominant (\(D\)).
- For allele \(A\), since it is uppercase, it is dominant (\(D\)).
- For allele \(F\), since it is uppercase, it is dominant (\(D\)).
- For allele \(m\), since it is lowercase, it is recessive (\(r\)).
- Section B:
- Homozvgous means having the same alleles. Heterozvgous means having different alleles.
- For \(GG\), since the alleles are the same, it is homozvgous (\(Ho\)).
- For \(yy\), since the alleles are the same, it is homozvgous (\(Ho\)).
- For \(Ff\), since the alleles are different, it is heterozvgous (\(He\)).
- For \(mm\), since the alleles are the same, it is homozvgous (\(Ho\)).
- For \(jj\), since the alleles are the same, it is homozvgous (\(Ho\)).
- For \(Pp\), since the alleles are different, it is heterozvgous (\(He\)).
- Section C:
- Homozvgous dominant (\(HoD\)) has two dominant alleles. Homozvgous recessive (\(HoR\)) has two recessive alleles.
- For \(dd\), since the alleles are the same and lowercase (recessive), it is homozvgous recessive (\(HoR\)).
- For \(jj\), since the alleles are the same and lowercase (assuming \(j\) is recessive as per the general rule of lowercase for recessive), it is homozvgous recessive (\(HoR\)).
- For \(Hh\), since the alleles are different, it is heterozvgous dominant (\(HeD\)).
- For \(cc\), since the alleles are the same and lowercase (assuming \(c\) is recessive), it is homozvgous recessive (\(HoR\)).
- For \(RR\), since the alleles are the same and uppercase (dominant), it is homozvgous dominant (\(HoD\)).
- For \(DD\), since the alleles are the same and uppercase (dominant), it is homozvgous dominant (\(HoD\)).
- For \(Ww\), since the alleles are different, it is heterozvgous dominant (\(HeD\)).
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- Section A: \(X - D\), \(A - D\), \(F - D\), \(m - r\)
- Section B: \(GG - Ho\), \(yy - Ho\), \(Ff - He\), \(mm - Ho\), \(jj - Ho\), \(Pp - He\)
- Section C: \(dd - HoR\), \(jj - HoR\), \(Hh - HeD\), \(cc - HoR\), \(RR - HoD\), \(DD - HoD\), \(Ww - HeD\)