Question

In: Biology

-With respect to chromosome content, which of the following cells will be most similar to a...

-With respect to chromosome content, which of the following cells will be most similar to a cell that is about to enter S phase?

A cell that has just completed meiosis II.

A cell just after mitosis.

A cell just before mitosis.

A cell that has just completed meiosis I.

-State two ways meiosis generates genetic variability.

-If you cross a parent with attached earlobes (recessive trait) with one that has free earlobes (dominant trait), what are ALL of the possible offspring phenotypic ratios?

3 free earlobes: 1 attached earlobes only

1 free: 0 attached or 1 free: 1 attached

1 free: 0 attached only

1 free: 3 attached only

-If you cross a heterozygous tongue roller with another heterozygous tongue roller, what are all of the possible offspring phenotypic ratios. Note: The ability to tongue roll is dominant to lacking the ability.

3 roller: 1 non-roller

1 roller: 0 non-roller

1 roller: 3 non-roller

1 roller: 0 non-roller or 1 free: 1 non-roller

Expert Solution

1) a cell entering into S phase has one unreplicated copy of each chromosome,

a cell that has completed meiosis II is haploid, there is only one set of chromosomes.

cell after mitosis has one unreplicated copy of each chromosome, during mitosis, the sister chromatids were separated and it ends up in two daughter cells, and the chromatids become chromosomes in the daughter cells.

cell before mitosis has chromosomes in duplicated state,

a cell that has completed meiosis I are haploid, homologous chromosomes are separated during meiosis I.

so the answer is b)A cell just after mitosis.

2) genetic variability is generated in meiosis via two processes

i) crossing over between non-sister chromatids

crossing over between non-sister chromatids changes the allele combination in a chromatid of a chromosome.

ii) independent assortment of chromosomes

the daughter cells can get one of the homologous chromosomes, so different combinations are possible.

if the diploid cell has 6 chromosomes, that is the haploid number is 3, for each chromosome, there are two chances so the number of different gametes due to independent assortment of chromosomes is 2^3=8

3) let the alleles be E-free earlobes e-attached earlobes

the genotype of the attached earlobe is ee, the genotype of the free earlobes can be EE or Ee

EE * ee

Ee ( free ear lobes)

all the progenies have free earlobes

if the genotype of the free earlobes is Ee

Ee * ee

	E	e
e	Ee (free-earlobes)	ee ( attached earlobes)

the phenotypic ratio is free earlobes: attached earlobes=1:1

so the answer is 1 free: 0 attached or 1 free: 1 attached

4) T- tongue rolling r- cannor roll tongue

Tt * Tt

	T	t
T	TT( tongue rolling)	Tt ( tongue rolling)
t	Tt( tongue rolling)	tt ( cannot roll tongue)

so phenotypic ratio is a) 3 roller: 1 non-roller

gladiator answered 2 years ago

Which of the following variances are most similar with respect to the manner in which they...

Which of the following variances are most similar with respect to the manner in which they are calculated? Multiple Choice Labor rate variance and labor efficiency variance. Material price variance and material quantity variance. Material price variance, material quantity variance, and total material variance. Material price variance and labor rate variance. Material price variance and labor efficiency variance.

In what respect is preferred stock similar to bonds, and in what respect is it similar...

In what respect is preferred stock similar to bonds, and in what respect is it similar to common stock? Please use examples to better demonstrate your explanations. I need the examples

With respect to how it reduces perceived default risk, a “serial bond” is most similar to:...

With respect to how it reduces perceived default risk, a “serial bond” is most similar to: a. Having a sinking fund provision. b. issuing the bond at par value. c. Making a bond callable. d. Making the bond AAA-rated. d. Making the bond convertible

Which of the following organelles is/are found in animal cells, but is/are absent in most plant cells?

Which of the following characteristics of chloroplasts make them seem more similar to bacterial cells than...

Which of the following characteristics of chloroplasts make them seem more similar to bacterial cells than to eukaryotic cells? ANSWERS: Translation is sensitive to chloramphenicol Alternate codons are found in the chloroplast genome Introns are present in genes DNA is not arranged in nucleosomes

In what respect is preferred stock similar to bonds, and in what respect is it simi-...

In what respect is preferred stock similar to bonds, and in what respect is it simi- lar to common stock?

Which of the combinations represents a complete yeast artificial chromosome (YAC) that is most likely to...

Which of the combinations represents a complete yeast artificial chromosome (YAC) that is most likely to segregate correctly? Explain your reasonings thoroughly! telomere-ARS-centromere telomere-ARS-centromere-100,000 bp insert telomere-centromere-100,000 bp insert-telomere telomere-ARS-centromere-11,000 bp insert-telomere suitable selectable markers telomere-ARS-centromere-100,000 bp insert-telomere

The most common form of Down syndrome is known as Trisomy 21, which is when chromosome...

The most common form of Down syndrome is known as Trisomy 21, which is when chromosome number 21 receives an extra copy through nondisjunction. This leads to each cell having a total of 47 chromosomes, and while people living with Down syndrome lead long, happy lives, they can experience abnormalities in their physical growth, cognitive capabilities, and are sometimes at greater risk in terms of health. Which cell checkpoint in the cell cycle would need to malfunction for nondisjunction to...

Which of the theorists’ views from the list below is most similar to Freud’s theories? Which...

Which of the theorists’ views from the list below is most similar to Freud’s theories? Which differs the most? Klein’s views of ego and superego Horney’s views of gender differences Erikson’s views of psychological developmental stages Fromm’s views of a mother’s influence on personality

This would NOT be found in mitosis: Select one: Cells with the same chromosome number and...

This would NOT be found in mitosis: Select one: Cells with the same chromosome number and identical DNA Sister chromatids Centromere Cells with reduced chromosome number with different DNA Diploid cell Clear my choice This best describes a cell with homologous chromosomes: Select one: A condition where chromosomes are found in an abnormal number in a cell A condition where chromosomes are unpaired, results in a haploid cell A condition where one parent provides two chromosomes to an offspring The...