If a trait is inherited in an autosomal recessive fashion, which of the following is not possible?

Please just explain correctly. Thank you!

If a trait is inherited in an autosomal recessive fashion, which of the following is not possible?

The trait often appears in the progeny of unaffected parents

About one-fourth of the offspring of two heterozygotes will be affected.

Two affected individuals can have an unaffected child

The trait will not occur in offspring if one of the parents is homozygous dominant.

Both sexes are equally affected.

In humans, hair texture is an incompletely dominant trait. Curly is the dominant genotype, wavy is heterozygous, and straight hair is recessive. What is the probable phenotypic ratio for a cross between a man with straight hair and a woman with curly hair?

1/4 curly hair; 1/2 wavy hair; 1/4 straight hair

All wavy hair

1/2 wavy hair; 1/2 curly hair

3/4 wavy hair; 1/4 straight hair

1/2 wavy hair; 1/2 straight hair

During the ________ of the cell cycle, DNA Replication takes place.

Metaphase

S phase

G2 phase

G1 phase

Mitotic

In humans, one set of chromosomes comes from the maternal parent, and the other set comes from the paternal parent. The chromosomes in these sets are said to be _________.

sister chromatids

analogues

haploid

homologous

alleles

 
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