Genetics

A gene that is expressed only in the homozygous state. ​ (a)  

• recessive
• dominant

The study of how traits are passed from parent to offspring.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Match the genotypes to the correct category.

Groups:

(a) homozygous dominant

,

(b) homozygous recessive

,

(c) Genotypes showing dominant trait

,

(d) Genotypes showing recessive trait

• rr

• tt

• HH

• aa

• TT

• Tt

• ee

• ff

• Nn

• nn

• KK

• Kk

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The physical features of an organism.

• genotype

• allele

• phenotype

• heredity

Tags

NGSS.MS-LS4-2

NGSS.MS-LS4-4

Draw a Punnett Square.

In a pea plant, a tall plant, P is dominant to short plant, p.

Cross Pp x pp

Answer explanation

Pp x pp

2 boxes= Pp

2 boxes= pp

What are the possible genotypes in this cross?

• AA, aa

• AA, Aa

• Aa

• AA, Aa, aa

Genetic makeup of an organism

Tags

NGSS.HS-LS3-1

A ​ (a)   genotype is made of two different alleles, resulting in the appearance of a ​ (b)   allele.​

• heterozygous
• dominant
• recessive
• homozygous

Different forms of genes for a single trait.

The ability to roll your tongue is a dominant trait. If the mother is homozygous dominant and the father is heterozygous, what are the possible phenotype(s) of the offspring?

• RR, Rr

• can roll tongue

• cannot roll tongue

• roll tongue & cannot roll tongue

Tags

NGSS.HS-LS3-1