Mary had a little ram whose fleece was blackness as coal; yet everywhere that Ma
ID: 224681 • Letter: M
Question
Mary had a little ram whose fleece was blackness as coal; yet everywhere that Mary went, the ram's progeny were invariably white as snow. What can your assume from this description, (other than I am not a poet)? a) Black must be a heterozygous condition in the ram. b.) None of the sheep the ram mated with were black-colored. c) White is a recessive allele. d.) If b = black, the matings involving the ram were all B_(female) x bb (male). e.) White fleece is an X-linked condition. A KRCAI mutation increases a women's risk of developing breast cancer nearly 50% by the time they reach age 70. Of women diagnosed with a fatal version of breast cancer, 1% of the cases were due to BRACI mutations in African-american women, versus 3% in Caucasian women, and 4% in Hispanic women a.) This is an illustration of how epitasis works. b.) This can be explained most simply by one word, expressivity. c.) This is an example of a lethal allele. d.) This is an example of penetrance and expressivity. e.) This is an obvious manifestation of haplosuffiency. Short Responses. Only write enough to make yourself clear. Consider the F2 outcome of a test cross if it returns 140 yellow smooth peas and 1 green smooth pea. (a) What alleles are dominant? (b) What would be the realistic expected numbers of each phenotype? (c) What would be the expected ratio if you were going to run a chi-square analysis? (d) How many degrees of freedom are necessary if you were required to perform a chi-square analysis of the data? (e) In 4 words or less, describe how a green smooth pea could show up as on offspring possibility.Explanation / Answer
Ans 9 d. If b = black, the matings involving ram were all B_ female x bb male
bb Is black because no other condition holds good to produce white progenies everytime.
If ram was considered heterozygous Bb even then he would produce white with Bb or even bb
So ram is homozygous recessive with genotype bb .