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This question is part of your extra credit. It will be out of 3 points, but that will not be displayed in Canvas for this question. I will enter it manually to allow for it to be extra credit. Detail two examples of how environmental conditions can affect how genotype is expressed as phenotype. You must pick two different environmental conditions and give details provided for each example in lecture.

Dosage compensation is accomplished in humans by inactivation of the Y chromosome.

Hemophilia A is an X-linked recessive trait.  A hemophiliac man wants to know the probability of having any children with hemophilia if he marries a normal woman with no history of the disease in her family.  The probability is ___.

Genes A and B are linked.  If the following heterozygous Drosophila female produces gametes, which gamete is a recombinant or crossover gamete? A  b / a   B

Which statement best describes the meaning of a p value in a chi-square analysis?

There are 40 multiple alleles for a particular locus on chromosome number 6 in humans. How many of these alleles do you have?

In the cross TtHh x TtHh nine phenotypes appear in the progeny.  The best explanation is:

Coat color in rabbits is inherited as a series of four multiple alleles (C+ agouti > cch  chinchilla  > ch  Himalayan > ca albino).  What F1 phenotypic ratio would result from a cross between a pure breeding agouti and a pure breeding albino?

In chickens, comb shape is determined by genes at two loci (R, r and P, p). A walnut comb is produced when at least one dominant gene R is present at one locus and at least one dominant gene P is present at a second locus (genotype R_ P_). A rose comb is produced when at least one dominant gene is present at the first locus and two recessive genes are present at the second locus (genotype R_ pp). A pea comb is produced when two recessive genes are present at the first locus and at least one dominant gene is present at the second (genotype rr P_). If two recessive genes are present at the first and the second locus (rr pp), a single comb is produced. Give genotypes for comb shape of the parents in the following cross:  Rose crossed with single produces 10 rose and 11 single offspring.

Using these sets of alleles in humans:  What is the probability of a couple having a child with attached earlobes and wavy red hair if their genotypes are Aah1h1Rr  and  Aah1h2rr ?             A_   free earlobes                    h1h1   straight hair      R_   non-red hair             aa   attached earlobes        h1h2   wavy hair            r r   red hair                                                                     h2h2   curly hair