Reference no: EM132598730

The ability to roll the tongue sideways (Aa(Bb2 marks eachWhat is the genotype of the mother?

) is dominant over the inability to roll one's tongue (). In humans, non-attached earlobes ) are dominant over attached earlobes (). Two parents with attached earlobes can roll their tongues. They are both heterozygous for the tongue rolling trait ().

1. What is the genotype of the father?
2. Whare are the possible gametes from the mother?
3. What are the possible gametes from the father?
4. Draw the Punnett square, and combine the gametes to produce offspring.
5. What is the phenotypic ratio of these offspring?
6. In summer squash, white fruit color (W) is dominant over yellow fruit color (w) and disk-shaped fruit (D) is dominant over sphere-shaped fruit (d). If a squash plant pure breeding for white and pure breeding for disk-shaped fruit is crossed with a plant pure breeding for yellow, sphere-shaped fruit, what will the phenotypic and genotypic ratios be for (2 marks each):
7. the F1 generation?
8. the F2 generation?

A dihybrid cross is a useful tool for looking at the proportion of offspring that will have specific phenotypes. use Punnett squares to solve problems involving dihybrid crosses.

Instructions

Solve the following problems. For each, provide a written response and a supporting Punnett square. Your Punnett square must be drawn by hand.