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Bio Mendelian Genetics
Terms in this set (22)
A couple has 6 children, all daughters. If the woman has a seventh child, what is the probability that the 7th child will be a daughter?
If alleles R and S are on two different chromosomes, and the probability of gametes R segregating into a gamete is 1/4, while the probability of allele S segregating into a gamete is 1/2, what is the probability that both will segregate into the same gamete?
1/4 X 1/2
In llamas, coat color is controlled a gene that exists in two allelic forms. If a homozygous yellow llama is crossed with a homozygous brown llama, the offspring have gray coats. If two of the gray coated offspring were crossed, what percentage of their offspring would have brown coats?
which of the following is NOT true of meiosis?
During metaphase, spindle microtubules first come into contact with chromosomes
In rabbits, the trait for short hair (S) is dominant, and the trait for long hair (s) is recessive. The trait for green eyes ( G) is dominant and the trait for blue eyes (g) is recessive. A cross b/w 2 rabbits produces a litter of 6 short-haired rabbits with green eyes and 2 short-haired rabbits with blue eyes. What is the most likely genotype of the parent rabbits in this cross?
SsGg X SSGg
In humans, hemophilia is an X linked recessive trait. If a man and a woman have a son who is affected with hemophilia, which of the following is definitely true?
The mother carries an allele for hemophilia
Which of the following explains a significant low rate of crossing b/w two genes?
The genes are located very close together on the same chromosome.
In the pedigree above, circles represent females and squares represent males: those who express a particular trait are shaded, whereas those who do not are not shaded. Which pattern of inheritance best describes the pedigree for this trait?
The father must have which of the following blood types?
A, B, or O
if a type O individual were to mate with a person with type AB blood, which of the following is the best calculation of the ratio of the offspring?
I ^ A i : I ^B i
Two yellow mice with the genotype Yy are mated. After many offspring, 2/3 are yellow and 1/3 are not yellow. Mendelian genetics dictates that this cross should produce offspring that were 1/4 YY (yellow), 1/2 Yy (yellow) and 1/4 yy ( not yellow). What is the most likely conclusion from this experiment?
Y is lethal in the homoygous form and caused death early in development.
All of the following contribute to genetic recombination except
In cucumbers, warty (W) is dominant over dull (w), and Green (G) is dominant over orange (g). A cucumber plant that is homozygous for warty and green is crossed with one that is homozygous for dull and orange. The F1 generation is then crossed. If 144 offspring are in the F2 generation, how many dull green cucumbers should there be?
The restoration of the diploid chromosome number after halving in meiosis is due to
During the first meiotic division (meiosis 1),
all of the above
A cell with a diploid number of 6 could produce gametes with how many different combinations of maternal and paternal chromosomes?
The DNA content of a diploid cell is measured in the G1 phase. After meiosis 1, the DNA content of one of the two cells produced would be
equal to that of the G1 cell
A synaptonemal complex would be found during
prophase 1 of meiosis
Meiosis 2 is similar to mitosis because
sister chromatids separate
which of the following is not true of homologous chromosomes
they synapse during the S phase of meiosis
Given the following recombination frequencies, what is the correct order of the genes on the chromosomes?
A-B, 8 map units; A-C, 28 map units; A-D, 25 map units; B-C, 20 map units; B-D 33 map units
D - A - B - C
X linked chromosomes are more common in men then women because
men need to inherit only one copy of the recessive allele for the condition to be fully expressed
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