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Progress Check 2: Genes & Alleles

Authored by Morgan Stilwell

Biology

9th Grade

14 Questions

NGSS covered

Used 14+ times

Progress Check 2: Genes & Alleles
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1.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What does it mean for an organism to be homozygous for a particular gene?

It has two different alleles for that gene.

It has two identical alleles for that gene.

It has only one allele for that gene.

It has no alleles for that gene.

Answer explanation

For an organism to be homozygous for a particular gene means it has two identical alleles for that gene. This is in contrast to being heterozygous, where there are two different alleles.

2.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following is an example of a heterozygous genotype?

AA

aa

Aa

A

Answer explanation

A heterozygous genotype consists of two different alleles for a trait. 'Aa' represents one dominant allele (A) and one recessive allele (a), making it heterozygous. In contrast, 'AA' and 'aa' are homozygous genotypes.

3.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following statements is true about homozygous chromosomes?

They always carry different alleles.

They always carry the same alleles.

They carry no alleles.

They carry only one allele.

Answer explanation

Homozygous chromosomes have identical alleles for a specific gene. This means they always carry the same alleles, making the statement 'They always carry the same alleles' the correct choice.

4.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following best describes a heterozygous chromosome pair?

Both chromosomes carry the same allele.

Each chromosome carries a different allele.

One chromosome carries an allele, and the other does not.

Neither chromosome carries an allele.

Answer explanation

A heterozygous chromosome pair consists of two different alleles, one on each chromosome. This means each chromosome carries a different allele, making 'Each chromosome carries a different allele' the correct choice.

5.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

An organism with two identical alleles for a trait is called:

Heterozygous

Homozygous

Hemizygous

Hyperzygous

Answer explanation

An organism with two identical alleles for a trait is termed homozygous. This contrasts with heterozygous, which refers to having two different alleles. Hemizygous and hyperzygous are not standard terms for this context.

6.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

If an individual has two different alleles for a given gene, they are considered:

Homozygous

Heterozygous

Hemizygous

Answer explanation

An individual with two different alleles for a gene is termed heterozygous. In contrast, homozygous refers to having two identical alleles, while hemizygous indicates having only one allele for a gene.

7.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

The genetic makeup of an organism

heterozygous

punnet square

genotype

Answer explanation

The genetic makeup of an organism is referred to as its genotype. This term describes the specific alleles an organism carries, distinguishing it from terms like heterozygous, which describes a specific genotype, and punnet square, which is a tool for predicting genotypes.

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