Please help with my practice questions:
____ converts a ____ into ovum.
a. Fertilization, primary oocyte
b. Meiosis I, primary oocyte
c. Meiosis I, 2secondary oocyte
d. Meiosis II, primary oocyte
e. Meiosis II, secondary oocyte
In addition to codominance, the ABO blood group antigens are also an example of ________.
a. incomplete dominance
b. X-linked recessive inheritance
c. multiple alleles
d. recessive lethal inheritance
e. complete dominance
Alleles are different versions of a ____.
Which does NOT produce variation?
a. crossing over
b. random alignment of chromosomes during meiosis
c. asexual reproduction
d. genetic recombination of alleles
e. sexual reproduction
a. are the same size
b. have genes for the same characteristics (even though the alleles may not be the same)
c. are in pairs, one chromosome of each pair from the father and one from the mother
d. pair up during meiosis
e. are all of these
Mendel suggested that the paired hereditary factors of a parent must separate during gamete formation. This is the principle of
c. independent assortment.
Select the total chromosome number per body cell that represents a monosomy in humans.
If a germ cell has 20 chromosomes, how many chromosomes will you find in the daughter cells, after meiosis?
Crossing over occurs between homologous chromosomes during what stage of cell division?
b. Prophase I of meiosis
c. Prophase II of meiosis
d. Prophase I of mitosis
e. Prophase II of mitosis
Mitosis results in ___cells and meiosis results in ___ cells.
a. diploid, diploid
b. haploid, haploid
c. haploid, diploid
d. diploid, haploid
a. leads to uniform characteristics in a population
b. results in new combinations of genetic traits
c. produces genetic clones
d. requires less tissue differentiation than asexual reproduction
e. produces genetic clones and requires less tissue differentiation than asexual reproduction
The sister chromatids become separated during ____ of meiosis
a. metaphase I
b. anaphase I
c. telophase I
d. anaphase II
e. prophase II
In incomplete dominance
a. one allele is not dominant to another allele
b. the genotype can be determined by the phenotype
c. the heterozygote is somewhat intermediate to the two homozygotes
d. the intermediate phenotype may be the result of enzyme insufficiency.
e. all of these are true
Mendel's law of independent assortment states that
a. one allele is always dominant to another
b. hereditary units from the male and female parents are blended in the offspring
c. the two hereditary units that influence a certain trait segregate during gamete formation
d. each hereditary unit is inherited separately from other hereditary units
e. all of these are true
Nondisjunction in meiosis II results in: _______
a. Two cells missing a chromosome and two healthy cells
b. Two cells missing a chromosome and two cells with an additional chromosome
c. Two cells with an additional chromosome and two healthy cells
d. One cell missing a chromosome, one cell with an additional chromosome and two healthy cells
e. None of these answers could be true
According to Mendel, what kinds of genes "disappear" in F1 pea plants?
For Mendel's explanation of inheritance to be correct
a. the genes for the traits he studied had to be located on the same chromosome
b. which gametes combine at fertilization had to be due to chance
c. genes could not be transmitted independently of each other
d. only diploid organisms would demonstrate inheritance patterns
e. none of these would occur
A testcross involves
a. two F1 hybrids
b. an F1 hybrid and a heterozygous organism
c. two parental organisms
d. an F1 hybrid and the homozygous dominant parent
e. an F1 hybrid and an organism that is homozygous recessive for that trait
An individual with a genetic makeup of aa BB is said to be
An X-linked carrier is a
a. homozygous dominant female.
b. heterozygous female.
c. homozygous recessive female.
d. homozygous male.
e. heterozygous male.