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Bisc Exam Final Exam Latest UpdateWhich of the following is a TRUE statement about sexual versus asexual
reproduction? - ANSWER In sexual reproduction, individuals transmit half of
their nuclear genes to each of their offspring.
In a human karyotype, chromosomes are arranged in 23 pairs. If we choose one of
these pairs, such as pair 14, which of the following do the two chromosomes of
the pair have in common? - ANSWER length, centromere position, staining
pattern, and traits coded for by their genes
Independent assortment of chromosomes occurs during _____. - ANSWER
meiosis I only
Which of the following occurs in meiosis but not in mitosis? - ANSWER synapsis
of chromosomes
Crossing over normally takes place during which of the following processes? -
ANSWER meiosis I
Which of the following might result in a human zygote with 45 chromosomes? -
ANSWER an error in either egg or sperm meiotic anaphase
Turner syndrome is characterized by the presence of only one X chromosome in
an affected female. Which of the following accurately describes Turner
syndrome? - ANSWER monosomy
What makes sexually reproduced offspring genetically different from their
parents? - ANSWER genetic recombination during meiosis
Mendel studies seven different traits in the garden pea. What genetic term is used
to describe an observable trait, such as those studied by Mendel? - ANSWER
phenotype
Albinism is an autosomal (not sex-linked) recessive trait. A man and woman are
both of normal pigmentation and have one child out of three who is albino
(without melanin pigmentation). What are the genotypes of the albino's parents? -
ANSWER Both parents must be heterozygous.
Different ratios occur in crosses with single gene pairs or two gene pairs. What
types of ratios are likely to occur in crosses dealing with a single gene pair?
Different ratios occur in crosses with single gene pairs or two gene pairs. What
types of ratios are likely to occur in crosses dealing with a single gene pair? -
, ANSWER 3:1, 1:1, 1:2:1
In a particular plant, leaf color is controlled by gene locus D. Plants with at least
one allele D have dark green leaves, and plants with the homozygous recessive
dd genotype have light green leaves. A true-breeding, dark-leaved plant is
crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate.
The predicted outcome of the F2 is diagrammed in the Punnett square shown in
the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each
box within the square. Which of the boxes marked 14 correspond to plants that
will be true-breeding?
Use the figure and the following description to answer the question(s) below.
In a particular plant, leaf color is controlled by gene locus D. Plants with at least
one allele D have dark green leaves, and plants with the homozygous recessive
dd genotype have light green leaves. A true-breeding, dark-leaved plant is
crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate.
The predicted outcome of the F2 is diagrammed in the Punnett square shown in
the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each
box within the square.
A Punnett square is drawn with two columns and two rows. Gametes outside the
square are uppercase D (above the top row and left of the first column) and
lowercase d (left of the bottom row and above the second column). Inside the
square, the boxes in the top row are labeled 1 (left) and 2 (right) and the boxes in
the bottom row are 3 (left) and 4 (right).
Which of the boxes marked 14 correspond to plants that will be true-breeding? -
ANSWER 1 and 4 only
Which of the following models shows the correct relationship between female
gametes (large gray circles), male gametes (small gray circles), and offspring
(yellow squares)? - ANSWER The haploid gametes are placed outside the
Punnett square, and the resulting offspring genotypes are written within the
Punnett square. Male gametes are placed together, either across the top or down
the side; female gametes are placed together, either down the side or across the
top.
Three of these Punnett squares will produce the same frequencies of predicted
offspring genotypes. Which one is different? - ANSWER This Punnett square
predicts 50% Hh offspring and 50% hh offspring, but the other Punnett squares
predict 50% HH and 50% Hh.
Which of these Punnett squares shows a cross that predicts green peas (yy) in
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