Question

1- What was one of the most significant conclusions that Gregor Mendel drew from his experiments with pea plants?

Group of answer choices

There is considerable genetic variation in garden peas.

An organism that is homozygous for many recessive traits is at a disadvantage.

Traits are inherited in discrete units and are not the results of "blending."

Genes are composed of DNA.

2- In a testcross, an unknown individual was crossed with a homozygous recessive individual and 50% of the testcross offspring were the dominant phenotype and 50% were the recessive phenotype. This means?

Group of answer choices

The unknown was heterozygous.

The unknown cannot be figured out based on the above information.

The unknown was homozygous recessive.

3- Which statement is most accurate regarding alleles?

Group of answer choices

Recessive alleles mask dominant ones

An alternative version of an allele is called a gene

Dominant alleles mask recessive ones

There can only be two copies of an allele in a population

4- When crossing two organisms for a single trait - one that is homozygous recessive with one that is homozygous dominant - what is the chance of producing an offspring with the homozygous recessive phenotype?

Group of answer choices

)%

75%

25%

100%

5- Incomplete dominance is when?

Group of answer choices

Homozygotes show an intermediate phenotype

There is no homozygous genotype

Heterozygotes show an intermediate phenotype

Heterozygotes share dominance

6- When antibodies in the plasma attach to antigens on the surface of the RBC this occurs.

Group of answer choices

nothing occurs

agglutination

coaggulation

7- Mendel's law of independent assortment states that

Group of answer choices

during meiosis, each pair of alleles segregates independently of the other pairs of alleles during gamete formation.

chromosomes sort independently of each other during mitosis and meiosis.

genes are sorted concurrently during gamete formation.

independent sorting of genes produces polyploid plants under some circumstances.

8- A carrier of a genetic disorder who does not show symptoms is most likely to be ______________ to transmit it to offspring.

Group of answer choices

heterozygous for the trait and unable

heterozygous for the trait and able

homozygous for the trait and unable

homozygous for the trait and able

9- New alleles in a population come about via what process?

Group of answer choices

mitosis

Mutation

fertilization
10- Genes found only on the X or Y chromosomes are said to be

Group of answer choices

dominant

sex linked

recessive only

autosomes

Answer 1

Q1. The most significant conclusion that Gregor Mendel drew from his pea plant was

Traits are inherited in discrete units and are not the results of "blending."

The characters of the pea, he selected for the experiment was never blended. Every character expressed discretely.

The other options are wrong because-

There is considerable genetic variation in garden peas- this was not a result of the Mendel experiment.

An organism that is homozygous for many recessive traits is at a disadvantage- Mendel never deducted the advantages of disadvantageous nature of traits. his experiment just showed how the characters inherit

Genes are composed of DNA--In that time, there was no concept about genes and DNA.

Q.2. In a testcross, an unknown individual was crossed with a homozygous recessive individual and 50% of the testcross offspring were the dominant phenotype and 50% were the recessive phenotype. This means?

The unknown was heterozygous.

When heterozygous are crossed with pure recessive then 50% of individuals show dominant characters and 50% show recessive characters.

suppose A is dominant and a is recessive.

Aa is heterozygous crossed with aa

In this cross 50% of the individual will show dominant characters with the Aa genotype and the rest of 50% will show recessive characters with aa genotype.

Q.3. Which statement is most accurate regarding alleles?

Recessive alleles mask dominant ones: false. In heterozygous condition dominant allele expressed.

An alternative version of an allele is called a gene: false. Different forms of gene is allele

Dominant alleles mask recessive ones: True. In heterozygous condition dominant allele expressed. So dominant masks recessive.

There can only be two copies of an allele in a population: False. In multiallelic characters, more than two allels exist.

Q.4 When crossing two organisms for a single trait - one that is homozygous recessive with one that is homozygous dominant - what is the chance of producing an offspring with the homozygous recessive phenotype?

suppose the gene is A which determines the character. The two contrasting alleles are A and a

The genotype of the homozygous dominant is AA and homozygous recessive is aa

If AA and aa crossed then every single offspring will be Aa (heterozygous) and show dominant character.

So the correct option is, 0% or no chance for the production of any homozygous recessive phenotype.