lecture quiz #4 Flashcards
mendel performed hybridizations by transferring pollen from the _______ of the male plant to the female ova.
anther
chromosomal abnormalities: correctly match the following abnormalities with their pictures.
A Deletion: B Duplication: C Inversion: D Translocation
the ABO blood groups in humans are expressed as the IA, IB, and i alleles. the IA allele encodes the A blood group antigen, IB encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one quarter of their offspring will have AB blood type (IAIB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:
multiple alleles and codominance and complete dominance
abnormalities in the number of X chromosomes tends to have milder phenotypic effects than the same abnormalities in autosomes because of ________.
x inactivation
which is NOT one of the seven characteristics that Mendel observed in pea plants?
leaf shape
consider a cross to investigate the pea pod texture trait, involving constricted or inflated pods. Mendel found that the traits behave according to a dominant/recessive pattern in which inflated pods were dominant. If you
performed this cross and obtained 850 inflated-pod plants in the F2 generation, approximately how many constricted-pod plants would you expect to have?
283
if black and white true-breeding mice are mated and the result is all gray offspring, what inheritance pattern would this be indicative of?
incomplete dominance
the forked line and probability methods make use of what probability rule?
product rule
incomplete dominance: if you want to guarantee that offspring have a 100% chance of being orange, what male and female parents should you cross?
red and yellow
complete dominance: what is the resulting phenotypic ratio if you cross a heterozygous red, heterozygous ruffled edge petunia with a homozygous yellow, homozygous smooth edged petunia.
4 red, ruffled: 4 red, smooth: 4 yellow, ruffled: 4 yellow, smooth
the observable traits expressed by an organism are described as its ________.
phenotype
X-linked recessive traits in humans (or in Drosophila) are observed ________.
in more males than females
in agriculture, polyploid crops (like coffee, strawberries, or bananas) tend to produce ________.
larger yields
a scientist pollinates a true-breeding pea plant with violet, terminal flowers with pollen from a true-breeding pea plant with white, axial flowers. Which of the following observations would most accurately describe the F2 generation?
75% violet flowers; 75% terminal flowers
the genotype XXY corresponds to ______________ & ____________ sex
klinefelter; male
