Quiz: Other patterns of inheritance

and has a

genotype

This Punnett square shows flower color inheritance in snapdragons. What is the expected ratio of red flowers to pink flowers to white flowers in the F2 generation?

1 red: 2 pink: 1 white

multiple alleles

Coat color in rabbits is expressed with four different phenotypes by a single gene

maternal inheritance

Genetic disorders in human mitochondrial DNA follow non. Mendelian patterns of inheritance

environmental influence on gene expression

Leaves on a tree can have different sizes and shapes depending on the amount of light they receive

Incomplete dominance

The F1 generation produced by a cross between red flowered (RR) and white flowered (rr) Four o clock plants consists of pink colored flowers (Rr)

polygenic traits

The distribution of plant heights forms a bell-shaped curve with intermediate heights occurring most often.

A variegated leaf has white patches. The patches occur where chlorophyll is missing from the chloroplasts in some of the cells. Chloroplasts have their own DNA, and are inherited from one parent only. How is the variegated leaf trait inherited?

Variegation is inherited from the female parent. Only the egg cell contributes cytoplasm with chloroplasts to the embryo.

Codominance

When a certain variety of black chicken is crossed with a white chicken, all of the offspring are checkered. Black and white feathers are produced in the offspring.

Coat color in rabbits is inherited by multiple alleles for a single gene. Would it be possible to obtain a white rabbit if one parent is white and the other is Himalayan?

Yes, if the genotype of the Himalayan parent rabbit is chc.

or either the black (B) allele or the white (W) allele. The genotype of an offspring of a black rooster and a white hen is

heterozygotes

in chickens, the allele for black feathers is co-dominant with the allele for white feathers. Black-feathered and white-feathered birds are

homozygotes

of BW. The

phenotype

Reddish pigment in wheat kernels is an inherited trait. In crosses between wheat plants with different kernel colors, a wide range of kernel color phenotypes is observed among the offspring. What pattern of inheritance is suggested by the graph?

polygenic inheritance

of the offspring shows

some white and some black features