GENETICS PRESENTATION

Multiple Choice

What defines a dominant trait?

• A trait that is always recessive

• A trait that is masked by another trait

• A trait that appears even if an organism has only one allele for it

• A trait that appears only if an organism has two alleles for it

Multiple Choice

Dominant alleles are represented by a(n)

• phenotype
• lower case letter
• upper case letter
• punnett square 

Multiple Choice

What are homologous chromosomes?

• Chromosomes that are identical

• Pairs of chromosomes from each parent

• Chromosomes that are different

• Chromosomes that do not match

Multiple Choice

Which of these is a reason that the chromosomes in the cell have two chromatids?

• Each chromatid contains unique genetic information.

• It allows the cell to divide into genetically identical daughter cells.

• A chromosome requires two chromatids to initiate protein synthesis.

• It allows genetic information to cross over between sister chromatids during mitosis, increasing genetic diversity.

Multiple Choice

What are the differences between homologous chromosomes, non-homologous chromosomes, and sister chromatids?

• Homologous chromosomes have the same genes but different alleles.

• Non-homologous chromosomes have different genes.

• Sister chromatids are identical copies of a chromosome.

Multiple Choice

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

• recessive

• dominant

• lower case letter

• both 

Multiple Choice

1 plant is heterozygous yellow (Yy) and it is crossed with a homozygous green (yy) plant. What is the probability of one of their offspring having a yellow color?

• 0 %

• 25 %

• 50 %

• 75 %

Multiple Choice

In pea plants, tall (T) is dominant over short (t). If two heterozygous tall pea plants are mated, what is the the expected genotypic ratio of their offspring?

• 3 tall : 1 short

• 1 TT : 2 Tt : 1 tt

Multiple Choice

In cats, short hair is dominant over long hair. Two heterozygous (Ss) cats mate. What is the genotypic ratio of the offspring? Hint: create a Punnett Square to solve this one!

• 1:1

• 3:1

• 1:2:1

Fill in the Blanks

Worth 3 pts

What percentage of the offspring from a BbLl x BbLl cross would be expected to be heterozygous for both traits?

^{Use either the FOIL method or the double-monohybrid method}

Multiple Choice

What is the phenotypic probability of the offspring being brown with straight hair?

• 1/4

• 3/16

• 1/16

• 1/2

Fill in the Blanks

In Holstein cattle, the allele for black hair color (B) is dominant over the allele for red hair color (b), and the allele for polled (P), or lacking horns, is dominant over the allele for having horns (p).

What is the expected phenotypic ratio of the offspring of a BbPp x BbPp cross if these alleles sort independently?

Multiple Choice

These are the chromosomes of someone with Kleinfelters syndrome. What is different about their chromosomes?

• There is only one Y chromosome

• One of the 5th chromosomes is too curved

• There is an extra X chromosome

• There are too few chromosomes

Multiple Choice

Codominance occurs in calico cats, which allows for the Black and Tan colors to show. What percentage of the offspring will be calico (black and tan spotted)?

• 25

• 50

• 75

• 100

Multiple Choice

Which of the following is an example of incomplete dominance?

• A red flower and a white flower producing red and white spotted flowers.

• A red flower and a white flower producing pink flowers.

• A red flower and a white flower producing only red flowers.

• A red flower and a white flower producing only white flowers.

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident