I need help with these practice bio questions! (Gr. 11 Bio) 1) Ms. K has blonde hair, a recessive trait. Her husband has brown hair, a dominant trait. Her second daughter has blonde hair. How is this possible? Use a punnett square to show how the genotypes of Ms. K and her husband could produce a blonde hair child. Include genotypic and phenotypic frequencies.        2) Explain with both proper terminology and a punnett square, why it is not possible for two white pea flowers (white is a recessive trait) could produce a purple flower.       3) Explain with both proper terminology and a punnett square why recessive traits can remain “hidden” in generations. Be sure to explain the difference between phenotype and genotype.

Chromosome s's c*c* s cC Pgeneration gamete formation gamete formation st- wild Hestcncs fertilization backcross the F, flies with recessive parent F, generation s's ctc Ss cc gamete formation s*sc*c gamete formation SC fertilization F, generation phenotypic ratio s*s cc ss c'c s's ctc 1 wild-type : 1 scarlet, curled : 1 curled : 1 scarlet SS C Figure 3.4: If the scarlet gene and curled gene are on separate chromosomes, they assort independently. s* c* st, c+ P generation S C female male S,C gamete formation gamete formation s*c+ SC fertilization backcross the female F, flies with recessive parent F1 generation chomo recess female male gamete formation gamete formation no crossover crossover UNLINKED s'c* SC stc+ SC sc* SC ststctct fertilization F, generation C S C S C s* c scarlet, wild-type curled scarlet curled non-recombinants: recombinants: lower proportion of flies greatest proportion of flies Figure 3.5: If the scarlet gene and curled gene are on the same chromosome (linked),…

PRACTICE QUESTIONS: Please show your work on Punnett squares wherever required. GENETICS 1. Name the scientist sometimes described as the "pioneer" of genetics. 2. Define the following terms: a) genotype b) phenotype d) dominant e) recessive c) allele 1. In humans normal thumbs (T) are dominant over hitch-hiker thumbs (t). A homozygous normal thumbed female is crossed with a male with hitch-hiker thumbs. What are the genotype and phenotype ratios of the F1 generation? Of the F2 generation? 2. In guinea pigs black fur (B) is dominant over white fur (b). Short hair (S) is dominant over long hair (s). If heterozygous female is crossed with a guinea pig with white and heterozygous short fur, what will be the phenotype ratio of the F1 generation? 3. Japanese four-o-clock's are an example of a plant that displays incomplete dominance. Plants can have red flowers (R) or white flowers (W). The heterozygous condition results in pink flowers. What would be the genotype and phenotype ratios of…

Task 5 A. Define the term epistasis. B. Labrador retrievers have 3 varieties of fur colour: yellow, chocolate or black. Two genes are involved, each with a dominant (Y and B) and a recessive allele (y and b). The allele Y codes for the ability to produce hair pigment: Yy and YY dogs have dark pigmented fur but all yy individuals are lighter coloured and yellow. The B allele codes for the ability to make hair with the darkest colouration: BB and Bb individuals have black fur, bb dogs have a lighter shade which is chocolate. In the blank Punnet Square below, calculate and state the ratio of phenotypes that occur with a cross between two individuals with the genotype YyBb.

Problem 3. If a woman is hemophiliac, she will give birth to only hemophiliac sons regardless of the genotype of the father. Construct a Punnett squares to confirm this. There should be two of them. a) Construct a Punnett Square - List gametes in the area with the dashed line and the genotypes of the offspring in the area with the sold line.     b) Construct a Punnett Square - List gametes in the area with the dashed line and the genotypes of the offspring in the area with the sold line. Please show in the actual punnett square table!