Genetics

Play an AI-generated podcast conversation about this lesson

Which of the following best describes a homozygous genotype?

Having two different alleles

Having two identical alleles (correct)

Having a heterozygous genotype

Having a dominant and a recessive allele

In a monohybrid cross, how many possible types of crosses are there?

4

2

1

3 (correct)

In pea-seed color, which allele is dominant?

R

r

Y (correct)

y

What is the phenotype ratio of a heterozygous tall pea plant crossed with a heterozygous tall pea plant?

3 Tall : 1 Dwarf Signup and view all the answers

Which of the following is true about sex determination in most mammals, including humans?

XX is female and XY is male Signup and view all the answers

What is the term for crosses involving two characteristics at a time?

Dihybrid cross Signup and view all the answers

According to Mendel's second law of independent assortment, during gamete formation, any member of a pair of factors has an equal chance of entering a gamete with...

Any other member of any other pair Signup and view all the answers

What happens when genes are located on the same chromosome?

They are inherited together Signup and view all the answers

Which type of mutation involves a change in chromosome number or alteration of genes within a chromosome?

Chromosome mutations Signup and view all the answers

What is the result of having 47 chromosomes, with an extra 'number 21' in every body cell?

Down Syndrome Signup and view all the answers

What is the main cause of variation among individuals of a species?

Sexual reproduction Signup and view all the answers

Which type of mutation involves a change in bases in the gene, altering the amino acid sequence of the protein controlled by that gene?

Gene mutations Signup and view all the answers

Which of the following best describes the phenomenon of crossing over during meiosis?

The swapping of sections of homologous chromosomes Signup and view all the answers

What is the term for genes found on the X or Y chromosome?

Heterosomes Signup and view all the answers

Which of the following best describes the term 'carrier' in the context of genetic conditions?

A female who has an allele for the abnormal condition but does not show it Signup and view all the answers

Which of the following statements about non-nuclear inheritance is true?

Non-nuclear DNA is always passed on by the female in the cytoplasm of the ovum Signup and view all the answers

Which of the following best describes the Law of Segregation according to Mendel's First Law?

Each gamete only receives one of each pair of genes. Signup and view all the answers

What is the term for the physical expression of the genotype or genotype plus environment?

Phenotype Signup and view all the answers

Which of the following best describes the concept of dominant and recessive alleles?

Dominant alleles are always expressed if present, while recessive alleles are masked by dominant alleles. Signup and view all the answers