At the earlobe shape in humans, the allele for unattached (U) is completely domi

Question

At the earlobe shape in humans, the allele for unattached (U) is completely dominant to the allele for attached (u) earlobes. The phenotype of a person homozygous for attached earlobes is:

a. attached earlobes

b. uu

c. UU

d. U_

At the earlobe shape in humans, the allele for unattached (U) is completely dominant to the allele for attached (u) earlobes. The genotyope of a person homozygous for attached earlobes is:

a. attached earlobes

b. uu

c. UU

d. U_

At the earlobe shape in humans, the allele for unattached (U) is completely dominant to the allele for attached (u) earlobes. The chance that a couple heterozygous at the earlobe shape locus will have a child with attached earlobes is:

a. zero

b. ¼

c. ½

d. ¾

e. 100%


In peas, the allele for purple flowers (P) is completely dominant to the allele for white flowers. If two pea plants heterozygous at the flower color locus have 1200 offspring, how many of these offspring do you expect to have white flowers?

a. zero

b. 300

c. 600

d. 900

e. 1200

If you do a chi-square test to determine if grades in bio 1406 are evenly distributed among the 5 categories (A, B, C, D, and F), the degrees of freedom for this statistical test would be:

a. 1

b. 2

c. 3

d. 4

e. 5

f. 6

I am just not understanding this yet. This is for a pre-lab and the teacher has not gone over this yet...

Explanation / Answer

for second question homozygous for attached earlobe mean person it (uu) so the answer is b keep in mind that if the ask for phenotype(result of genotype+ environment) then answer is a for third step one - as it is given that parents are hetrozygous so they are (Uu) then by doing the cross between them Uu * Uu we get following F1 progeny 1.UU--- UNATTACHED --25% 2.Uu----UNATTACHED--50% 3.uu-----attached -----25% so the answer is 25% which is B (1/4) for 4th as we know allele for purpple (P) IS DOMINANT TO WHITE. SO IN ORDER TO GET WHITE IT SHOULD BE HOMOGYOUS FOR ALLELE p that is(pp) which is 25% so 25% of 1200=is 300 hence answere is B

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