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In: Biology

In horses, black coat (B) is dominant over brown coat (b), and being a trotter (T)...

In horses, black coat (B) is dominant over brown coat (b), and being a trotter (T) is dominant over being a pacer (t). A heterozygous black coat, trotter male and a heterozygous black coat, trotter female are crossed. Complete the Punnett Square and determine the phenotypes of their potential offspring.

Phenotypes: _________________________________________________

In pea plants, the gene for round seed (R) is dominant, and wrinkled seeds (r) are recessive. The endosperm of the pea is also either starchy, a dominant gene (S), or waxy (s). Complete the Punnett Square and determine the phenotypes of the offspring when RrSs and rrss parents are crossed.

Phenotypes: __________________________________________________

In guinea pugs, B = black coat, b = brown coat, S = short hair, s = long hair. Complete the Punnett Square and determine the phenotypes of the offspring when BBSS and bbss parents are crossed.

Phenotypes: __________________________________________________

Expert Solution

1. BbTT x BbTT

Gametes- BT, BT,bT, bT

BT

bT

BT

BBTT

Black trotter

BBTT

Black trotter

BbTT

Black trotter

BbTT

Black trotter

BT

BBTT

Black trotter

BBTT

Black trotter

BbTT

Black trotter

BbTT

Black trotter

bT

BbTT

Black trotter

BbTT

Black trotter

bbTT

brown trotter

bbTT

brown trotter

bT

BbTT

Black trotter

bBTT

Black trotter

bbTT

brown trotter

bbTT

brown trotter

12 : 4 = Black trotter : brown trotter

2. RrSs x rrss

round starchy x wrinkled waxy

Gametes for RrSs - RS, Rs, rS, rs

Gametes for rrss- rs

	RS	Rs	rS	rs
rs	RrSs round starchy	Rrss round waxy	rrSs wrinkled starchy	rrss wrinkled waxy
rs	RrSs	Rrss	rrSs	rrss
rs	RrSs	Rrss	rrSs	rrss
rs	RrSs	Rrss	rrSs	rrss

round starchy: round waxy: wrinkled starchy: wrinkled waxy = 1:1:1:1

3. BBSS X bbss

Gametes BBSS - all BS

Gametes of bbss- all bs

	BS	BS	BS	BS
bs	BbSS black coat short hair	bBsS black coat short hair	BbSs black coat short hair	BbSs black coat short hair
bs	BbSs	BbSs	BbSs	BbSs
bs	BbSs	BbSs	BbSs	BbSs
bs	BbSs	BbSs	BbSs	BbSs

all black coat short hair

gladiator answered 2 years ago

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In horses, black coat (B) is dominant over brown coat (b), and being a trotter (T)...

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