Question

Unit : Assignment Module Mendalian Genetics and Inheritance Use the following information to answer questions 11 and 12 Mid-Digital Hair and Freckles Finger mid-digital hair is dominant over the recessive trait of no mid-digital hair (m). Freckles are dominant over the recessive trait of no freckles (It is important to note that this example of mid-digital hair and freckles cannot be explained with simple genetics, but for the purpose of this question, assume that it can.) A woman that is heterozygous for freckles and has no mid-digital hair is married to a man with no freckles that is heterozygous for mid-digital hair. The couple is expecting a child. 11. Draw a Punnett square of this cross. (1) 12. a. What is the probability that their offspring will have mid-digital hair? b. What is the probability that two offspring in a row will have no freckles? ADLC | Biology 30

Answer 1

11. Draw a Punnett square of this cross. Fm fm Woman ("Ffmm") can produce gametes => "Fm" & "fm". Man ("ffMm") can produce gametes => "M" & "fm". fM FfMm ffMm fm Ffmm ffmm 12. a. What is the probability that their offspring will have mid-digital hair? Two out of four offsprings have dominant allele (M) for mid-digital hair => "FfMm" & "ffMm". So the probability would be 2/4 or 1/2 or 0.5. b. What is the probability that two offspring in a row will have no freckles? The probability of getting no freckles ("ff") is 2/4 or 1/2. Hence probability of getting two offsprings with no freckles in a row will be 1/2 x 1/2 = 1/4 or 0.25.