A person has long fingers (dominant allele). Their genotype is ______.?

Question

A person has long fingers (dominant allele). Their genotype is ______.

a) SS

b) Ss

c) Long fingers

d) Could SS or Ss

I’m leaning towards D

Answer 1

Lil Butterfly,

Once again, your ‘inclination’ is correct! The answer is “D”. For example - a dominant allele is represented with a capital letter (eg S) and recessive allele with the same lower case letter (eg s). A dominant allele always shows (eg shows if the organism has the pair of genes SS or Ss). A recessive allele only shows when both the alleles are recessive (ss) (or when it is on its own because it's on a s*x chromosome).The gene that is dominant masks (hides) the effect of the recessive gene. Eg the short finger gene. (S) is dominant to short finger gene (s). The SS and Ss combinations both give long fingers, and only the ss combination gives short fingers.The way genes express themselves in the individual's appearance is their phenotype, eg “long fingers”. The combination of alleles is called its genotype, eg Ss. Homozygous means having two of the same allele for a characteristic eg SS or ss, BB or bb etc. They are called true breeding. Heterozygous means having different alleles for a characteristic eg Ss, Bb etc. These are also called hybrids. The subject is lengthy, and I shall not discuss more at this stage!

Hope this helps

matador 89

Answer 2

d.

The allele is dominant so there only has to be one present for it to be expressed.

Answer 3

If long fingers is dominant, it could be SS or Ss, since s is overwhelmed by S.

Answer 4

yeah it's d. the recessive s will not show as long as their is S so it could be either one.

Answer 5

D