Question

1a. In comparing somatic cells and gamete, somatic cells are:

a. diploid with twice the # of chromosomes

b. haploid with half the # of chromosomes

c. none of the responses are correct

d. diploid with half the # of chromosomes

e. haploid with twice the # of chromosomes

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1b. Which of the following mitosis phases is essentially the opposite of prophase in terms of nuclear changes

a. metaphase

b. anaphase

c. cytokinesis

d. telophase

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1c. Gene S controls the sharpness of spines in a type of cactus. Cacti with dominant allele, S, have sharp spines, whereas homozygous recessive cacti have dull spines. At the same time, a second gene, N determines whether or not cactuses have spines. Homozygous recessive cacti have no spines at all. A cross between a true-breeding sharp spined cactus and a spineless cactus will produce:

a. It is impossible to determine the phenotypes

b. 50% sharp-spined, and 50% dull-spined

c. all sharp spined

d. 25% sharp-spined, 50% dull-spined, and 25% spineless

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1d. What is the probability of producing the genotype AABBCC in a cross of individuals who both possess this genotype : AaBbCc

a. 1/16

b. 1/64

c. 1/4

d. 1/32

Dont need explanations need answers to compare. Thank you so much will upvote if correct!

Answer 1

1a.

In comparing somatic cells and gamete, somatic cells are diploid with twice the number of chromosomes.

Somatic cells are diploid and they multiply by equational division or mitosis. Gametes are formed by reduction division or meiosis and are haploid. Gametes contain half the number of chromosomes compared to somatic cells.

Other options are incorrect.

Option a is the answer.

diploid with twice the # of chromosomes is the answer.

1b.

Telophase is the phase which is essentially opposite of prophase in terms of nuclear changes.

During prophase,

* nucleolus disappears

* nuclear membrane breaks

* chromosomes condenses.

In Telophase events are opposite compared to prophase. During telophase

* nucleolus reappears

* decondensation of chromatin

* nuclear envelope reappears.

Other options are wrong.

Option d is the answer.

Telophase is the answer.

1c.

Gene S controls the sharpness of spines in cactus - Dominant allele is S with sharp spines

Homozygous recessive spines have dull spines - ss

Second gene, N determines whether or not cactuses have spines

Homozygous recessive cacti have no spines at all - nn

* A cross between true breeding sharp spined cactus and a spineless cactus

SSNN X ssnn

Punnett square

	sn	sn
SN	SsNn Sharp spined	SsNn Sharp spined
SN	SsNn Sharp spined	SsNn Sharp spined

All are sharp spined individuals.

Option c is the answer.

all sharp spined is the answer.

1d.

cross between

AaBbCc X AaBbCc

Here there is the possibility of 8 different gametes. (1/8 )³ = 64

So the probability of producing AABBCC is 1/ 64 according to law of segregation.

Other options are incorrect.

Option b is the answer.

1 / 64 is the correct answer.