03.07 Heredity Patterns
The allele for a widow's peak has complete dominance over the allele for a straight hairline (w). What is the probability of two parents heterozygous for a widow's peak (Ww) having an offspring with a widow's peak? 75 percent 50 percent 0 percent 25 percent
I got this one wrong, but it is NOT "50 percent".
This pedigree chart tracks the inheritance of a recessive trait that is not sex-linked. Based on the information in the chart, which of the following statements is true? (This pedigree chart shows three generations. The individuals are numbered from left to right, starting at the top left of the chart. Squares represent males and circles represent females. If the symbol is gray, that individual exhibits the recessive trait. If the symbol is white, the individual exhibits the dominant trait. On the first row there are two couples mated together. The first couple is made up of individuals #1 (recessive) and #2 (dominant). They have four offspring on the second row that all exhibit dominant traits: #5 (dominant), #6 (dominant), #7 (dominant), and #8 (dominant). The second couple in Generation #1 is made up of individual #3 (dominant) and individual #4 (dominant). They have three offspring in Generation 2: #9 (dominant), #10 (recessive), and #11 (dominant). Individual #8 from the first family and individual #9 from the second family mated together and produced three offspring in Generation 3. These offspring are #12 (recessive), #13 (dominant), and #14 (recessive).) Individual #8 must be heterozygous for the trait. Individual #10 must be heterozygous for the trait. Individual #13 must be homozygous dominant. Individual #3 must be homozygous dominant.
a
A plant grows faster and fuller due to large amounts of fertilizer. If the plant cross-pollinates with another plant later, how will the use of fertilizer on the parent plant affect the plant's offspring? All of the offspring will be taller than average because the parent plant's genes were affected. Some of the offspring will be taller than average because some of the alleles were affected. The height of the offspring will not change because the parent's genes did not change. The height of some of the offspring will be taller if the other parent plant was also fertilized.
c
If a corn plant has a genotype Sstt, what are the possible genetic combinations that could be present in a single grain of pollen produced by the plant? Ss, tt, St, st Ss, tt, St, ST St, st St, sT, st
c
In a monohybrid cross, if the gene for tall (T) plants was incompletely dominant over the gene for short (t) plants, what would be the predicted result of crossing an intermediate (Tt) plant with a tall (TT) plant? (Hint: You may want to complete a Punnett square.) 50 percent tall, 25 percent intermediate, 25 percent short 25 percent tall, 50 percent intermediate, 25 percent short 50 percent tall, 50 percent intermediate 100 percent intermediate
c
What are the genotypes of the parents in the monohybrid cross below if the following offspring genotypes are predicted? (Again, i'm not going to draw a graph, so take what i said in question 4 and keep that in mind when completing this question. :]) Tt and Tt TT and tt Tt and TT Tt and tt
c
If a boy exhibits a sex-linked trait that is carried on the X chromosome, what must be true? His mother exhibited that trait. His father exhibited that trait. His father's mother carried an allele for that trait. His mother carried at least one allele for that trait.
d
In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If two red-eyed heterozygous flies (Rr) mate together, what are the possible genotypes of their offspring? (Hint: You may want to complete a Punnett square.) RR and Rr Rr only RR and rr RR, Rr, and rr
d
In one type of dog, black spots (B) are dominant over brown spots (b) and long tails (L) are dominant over short tails (l). Use the dihybrid cross for parents with the genotypes BBLl and BbLl and determine the likelihood of offspring with the genotype BBLl. (i'm sorry i don't have the energy to draw another graph, but beware that every school platform will have a different graph to go along with this question, so don't say mine is wrong, because it was right for my graph, and your graph is probably different then mine. :]) 1/16 2/16 3/16 4/16
d
Which of the following genotypes is homozygous dominant? tt Ff XY SS
d
